Remove test since ghostscript error handling changed

fix ._hocr

.docker/Dockerfile

@@ -1,7 +1,7 @@
-# SPDX-FileCopyrightText: 2022 James R. Barlow
+# SPDX-FileCopyrightText: 2024 James R. Barlow
 # SPDX-License-Identifier: MPL-2.0
 
-FROM ubuntu:22.04 as base
+FROM ubuntu:24.04 AS base
 
 ENV LANG=C.UTF-8
 ENV TZ=UTC
@@ -9,19 +9,15 @@ RUN echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selectio
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
   python3 \
-  libqpdf-dev \
-  zlib1g \
-  liblept5
+  python-is-python3
 
-FROM base as builder
+FROM base AS builder
 
 # Note we need leptonica here to build jbig2
 RUN apt-get update && apt-get install -y --no-install-recommends \
   build-essential autoconf automake libtool \
   libleptonica-dev \
   zlib1g-dev \
-  python3-dev \
-  python3-distutils \
   libffi-dev \
   ca-certificates \
   curl \
@@ -29,42 +25,50 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   libcairo2-dev \
   pkg-config
 
-# Get the latest pip (Ubuntu version doesn't support manylinux2010)
-RUN \
-  curl https://bootstrap.pypa.io/get-pip.py | python3
-
 # Compile and install jbig2
 # Needs libleptonica-dev, zlib1g-dev
 RUN \
   mkdir jbig2 \
-  && curl -L https://github.com/agl/jbig2enc/archive/ea6a40a.tar.gz | \
+  && curl -L https://github.com/agl/jbig2enc/archive/c0141bf.tar.gz | \
   tar xz -C jbig2 --strip-components=1 \
   && cd jbig2 \
   && ./autogen.sh && ./configure && make && make install \
   && cd .. \
   && rm -rf jbig2
 
-COPY . /app
 
 WORKDIR /app
 
-RUN pip3 install --no-cache-dir .[test,webservice,watcher]
+# Copy uv from ghcr
+COPY --from=ghcr.io/astral-sh/uv:0.6.14 /uv /uvx /bin/
+
+ENV UV_COMPILE_BYTECODE=1 UV_LINK_MODE=copy
+
+# Install the project's dependencies using the lockfile and settings
+RUN --mount=type=cache,target=/root/.cache/uv \
+    --mount=type=bind,source=uv.lock,target=uv.lock \
+    --mount=type=bind,source=pyproject.toml,target=pyproject.toml \
+    uv sync --frozen --no-install-project --no-dev
+
+# Then, add the rest of the project source code and install it
+# Installing separately from its dependencies allows optimal layer caching
+COPY . /app
+RUN --mount=type=cache,target=/root/.cache/uv \
+    uv sync --frozen \
+        --extra test --extra webservice --extra watcher --no-dev \
+        --no-install-package pyarrow
 
 FROM base
 
-# For Tesseract 5
-RUN apt-get update && apt-get install -y --no-install-recommends \
-  software-properties-common gpg-agent
-RUN add-apt-repository -y ppa:alex-p/tesseract-ocr-devel
+RUN apt-get update && apt-get install -y software-properties-common
+
+RUN add-apt-repository -y ppa:alex-p/tesseract-ocr5
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
   ghostscript \
   fonts-droid-fallback \
   jbig2dec \
-  img2pdf \
-  libsm6 libxext6 libxrender-dev \
   pngquant \
-  python-is-python3 \
   tesseract-ocr \
   tesseract-ocr-chi-sim \
   tesseract-ocr-deu \
@@ -80,11 +84,13 @@ WORKDIR /app
 COPY --from=builder /usr/local/lib/ /usr/local/lib/
 COPY --from=builder /usr/local/bin/ /usr/local/bin/
 
-COPY --from=builder /app/misc/webservice.py /app/
-COPY --from=builder /app/misc/watcher.py /app/
+COPY --from=builder --chown=app:app /app /app
 
-# Copy minimal project files to get the test suite.
-COPY --from=builder /app/pyproject.toml /app/README.md /app/
-COPY --from=builder /app/tests /app/tests
+RUN rm -rf /app/.git && \
+ln -s /app/misc/webservice.py /app/webservice.py && \
+ln -s /app/misc/watcher.py /app/watcher.py
+
+ENV PATH="/app/.venv/bin:${PATH}"
+
+ENTRYPOINT ["/app/.venv/bin/ocrmypdf"]
 
-ENTRYPOINT ["/usr/local/bin/ocrmypdf"]

.docker/Dockerfile.alpine

@@ -1,7 +1,13 @@
 # SPDX-FileCopyrightText: 2023 James R. Barlow
 # SPDX-License-Identifier: MPL-2.0
 
-FROM alpine:3.19.1 as base
+# Note: Alpine 3.20 builds tesseract with --enable-opencl, which is not
+# supported by anyone. OCRmyPDF is not compatible with Alpine 3.20.0
+# through 3.20.3. The issue is fixed in 3.21.
+# Details
+#  https://gitlab.alpinelinux.org/alpine/aports/-/issues/16143
+#  https://github.com/ocrmypdf/OCRmyPDF/issues/1395
+FROM alpine:3.21 AS base
 
 ENV LANG=C.UTF-8
 ENV TZ=UTC
@@ -10,40 +16,37 @@ RUN apk add --no-cache \
     python3 \
     zlib
 
-FROM base as builder
+FROM base AS builder
 
+# Yes it really is python3-dev, and py3-package
 RUN apk add --no-cache \
     ca-certificates \
     git \
     python3-dev \
-    py3-pip
-
-# On arm64, we need to build cffi from source.
-ARG TARGETPLATFORM
-
-RUN if [ "${TARGETPLATFORM}" == "linux/arm64" ]; then \
-    apk add --no-cache \
-    build-base \
-    autoconf \
-    automake \
-    libtool \
-    zlib-dev \
-    libffi-dev \
-    cairo-dev \
-    pkgconfig \
-    ;  \
-    fi
-
-COPY . /app
+    py3-pyarrow \
+    curl
 
 WORKDIR /app
 
-RUN python3 -m venv .venv
+COPY --from=ghcr.io/astral-sh/uv:0.6.14 /uv /uvx /bin/
 
-RUN source .venv/bin/activate \
-    && python3 -m pip install --no-cache-dir --upgrade pip \
-    && python3 -m pip install --no-cache-dir wheel \
-    && python3 -m pip install --no-cache-dir .[test,webservice,watcher]
+ENV UV_COMPILE_BYTECODE=1 UV_LINK_MODE=copy
+
+RUN uv venv --system-site-packages .venv
+
+# Install the project's dependencies using the lockfile and settings
+RUN --mount=type=cache,target=/root/.cache/uv \
+    --mount=type=bind,source=uv.lock,target=uv.lock \
+    --mount=type=bind,source=pyproject.toml,target=pyproject.toml \
+    uv sync --frozen --no-install-project --no-dev
+
+# Then, add the rest of the project source code and install it
+# Installing separately from its dependencies allows optimal layer caching
+COPY . /app
+RUN --mount=type=cache,target=/root/.cache/uv \
+    uv sync --frozen \
+        --extra test --extra webservice --extra watcher --no-dev \
+        --no-install-package pyarrow
 
 FROM base
 
@@ -66,17 +69,11 @@ RUN apk add --no-cache \
 
 WORKDIR /app
 
-COPY --from=builder /usr/local/lib/ /usr/local/lib/
-COPY --from=builder /usr/local/bin/ /usr/local/bin/
+COPY --from=builder --chown=app:app /app /app
 
-COPY --from=builder /app/.venv/ /app/.venv/
-
-COPY --from=builder /app/misc/webservice.py /app/
-COPY --from=builder /app/misc/watcher.py /app/
-
-# Copy minimal project files to get the test suite.
-COPY --from=builder /app/pyproject.toml /app/README.md /app/
-COPY --from=builder /app/tests /app/tests
+RUN rm -rf /app/.git && \
+    ln -s /app/misc/webservice.py /app/webservice.py && \
+    ln -s /app/misc/watcher.py /app/watcher.py
 
 ENV PATH="/app/.venv/bin:${PATH}"
 

.github/workflows/build.yml

@@ -19,26 +19,16 @@ jobs:
   test_linux:
     name: Test ${{ matrix.os }} with Python ${{ matrix.python }}
     runs-on: ${{ matrix.os }}
-    continue-on-error: ${{ matrix.experimental }}
     strategy:
       matrix:
-        experimental: [false]
+        os: [ubuntu-22.04, ubuntu-24.04]
+        python: ["3.10", "3.11", "3.12", "3.13"]
         include:
           - os: ubuntu-22.04
+            tesseract_ppa: "ppa"
             python: "3.10"
-          - os: ubuntu-22.04
-            python: "3.11"
-          - os: ubuntu-22.04
-            python: "3.10"
-            tesseract5: true
-          - os: ubuntu-latest
-            python: "3.12"
-            tesseract5: true
-          - os: ubuntu-latest
+          - os: ubuntu-24.04
             python: "pypy3.10"
-          - os: ubuntu-22.04
-            python: "3.13"
-            experimental: true
 
     env:
       OS: ${{ matrix.os }}
@@ -49,17 +39,20 @@ jobs:
         with:
           fetch-depth: "0" # 0=all, needed for setuptools-scm to resolve version tags
 
-      - uses: actions/setup-python@v5
-        name: Setup Python
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+        with:
+          version: "0.5.x"
+
+      - name: "Set up Python"
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python }}
-          cache: "pip"
-          allow-prereleases: ${{ matrix.experimental }}
 
-      - name: Install Tesseract 5
-        if: matrix.tesseract5
+      - name: Install Tesseract from PPA
+        if: matrix.tesseract_ppa == 'ppa'
         run: |
-          sudo add-apt-repository -y ppa:alex-p/tesseract-ocr-devel
+          sudo add-apt-repository -y ppa:alex-p/tesseract-ocr5.3
 
       - name: Install common packages
         run: |
@@ -91,8 +84,7 @@ jobs:
 
       - name: Install Python packages
         run: |
-          python -m pip install --upgrade pip wheel
-          python -m pip install --prefer-binary .[test]
+          uv sync --extra test --no-dev
 
       - name: Report versions
         run: |
@@ -100,28 +92,27 @@ jobs:
           gs --version
           pngquant --version
           unpaper --version
-          img2pdf --version
+          uv run --no-dev img2pdf --version
 
       - name: Test
         run: |
-          python -m pytest --cov-report xml --cov=ocrmypdf --cov=tests/ -n0 tests/
+          uv run --no-dev pytest --cov-report xml --cov=ocrmypdf --cov=tests/ -n0 tests/
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
         with:
           files: ./coverage.xml
           env_vars: OS,PYTHON
 
-
   test_macos:
     name: Test macOS
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os: [macos-latest, macos-13]  # macos-latest is arm64, macos-13 is x86_64
-        python: ["3.10", "3.11", "3.12"]
+        python: ["3.10", "3.11", "3.12", "3.13"]
 
     env:
       OS: ${{ matrix.os }}
@@ -144,30 +135,33 @@ jobs:
             pngquant \
             tesseract
 
-      - uses: actions/setup-python@v5
-        name: Setup Python
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+        with:
+          version: "0.5.x"
+
+      - name: "Set up Python"
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python }}
-          cache: "pip"
 
       - name: Install Python packages
         run: |
-          python -m pip install --upgrade pip wheel
-          python -m pip install --prefer-binary .[test]
+          uv sync --extra test --no-dev
 
       - name: Report versions
         run: |
           tesseract --version
           gs --version
           pngquant --version
-          img2pdf --version
+          uv run --no-dev img2pdf --version
 
       - name: Test
         run: |
-          python -m pytest --cov-report xml --cov=ocrmypdf --cov=tests/ -n0 tests/
+          uv run --no-dev pytest --cov-report xml --cov=ocrmypdf --cov=tests/ -n0 tests/
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
         with:
@@ -180,7 +174,7 @@ jobs:
     strategy:
       matrix:
         os: [windows-latest]
-        python: ["3.10", "3.11", "3.12"]
+        python: ["3.10", "3.11", "3.12", "3.13"]
 
     env:
       OS: ${{ matrix.os }}
@@ -191,11 +185,15 @@ jobs:
         with:
           fetch-depth: "0" # 0=all, needed for setuptools-scm to resolve version tags
 
-      - uses: actions/setup-python@v5
-        name: Setup Python
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+        with:
+          version: "0.5.x"
+
+      - name: "Set up Python"
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python }}
-          cache: "pip"
 
       - name: Install system packages
         run: |
@@ -204,15 +202,14 @@ jobs:
 
       - name: Install Python packages
         run: |
-          python -m pip install --upgrade pip wheel
-          python -m pip install --prefer-binary .[test]
+          uv sync --extra test --no-dev
 
       - name: Test
         run: |
-          python -m pytest --cov-report xml --cov=ocrmypdf --cov=tests/ -n0 tests/
+          uv run --no-dev pytest --cov-report xml --cov=ocrmypdf --cov=tests/ -n0 tests/
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
         with:
@@ -227,16 +224,14 @@ jobs:
         with:
           fetch-depth: "0" # 0=all, needed for setuptools-scm to resolve version tags
 
-      - uses: actions/setup-python@v5
-        name: Setup Python
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
         with:
-          python-version: "3.10"
-          cache: "pip"
+          version: "0.5.x"
 
       - name: Make wheels and sdist
         run: |
-          python -m pip install --upgrade pip wheel build
-          python -m build --sdist --wheel
+          uv build --sdist --wheel
 
       - uses: actions/upload-artifact@v4
         with:
@@ -278,9 +273,9 @@ jobs:
           path: dist
 
       - name: Sign the dists with Sigstore
-        uses: sigstore/gh-action-sigstore-python@v2.1.1
+        uses: sigstore/gh-action-sigstore-python@v3.0.0
         with:
-          inputs: >-
+          inputs: |
             ./dist/*.tar.gz
             ./dist/*.whl
 
@@ -289,8 +284,8 @@ jobs:
           GITHUB_TOKEN: ${{ github.token }}
         run: >-
           gh release create
-          '${{ github.ref_name }}'
-          --repo '${{ github.repository }}'
+          "$GITHUB_REF_NAME"
+          --repo "$GITHUB_REPOSITORY"
           --notes ""
 
       - name: Upload artifact signatures to GitHub Release
@@ -301,8 +296,8 @@ jobs:
         # sigstore-produced signatures and certificates.
         run: >-
           gh release upload
-          '${{ github.ref_name }}' dist/**
-          --repo '${{ github.repository }}'
+          "$GITHUB_REF_NAME" dist/**
+          --repo "$GITHUB_REPOSITORY"
 
   docker_ubuntu:
     name: Build Ubuntu-based Docker image

.github/workflows/triage.yml

@@ -0,0 +1,32 @@
+# SPDX-FileCopyrightText: 2024 James R. Barlow
+# SPDX-License-Identifier: MPL-2.0
+
+name: Remove Triage Label on Reply
+
+on:
+  issue_comment:
+    types:
+      - created
+
+jobs:
+  remove-triage-label:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check if comment is by the repository owner
+        id: check_comment
+        run: |
+          echo "::set-output name=is_owner::$(
+            if [[ '${{ github.event.comment.user.login }}' == 'jbarlow83' ]]; then
+              echo 'true';
+            else
+              echo 'false';
+            fi
+          )"
+
+      - name: Remove 'triage' label
+        if: ${{ steps.check_comment.outputs.is_owner == 'true' }}
+        uses: actions-ecosystem/action-remove-labels@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          labels: triage

.gitignore

@@ -44,4 +44,6 @@ docs/_build/
 docs/_static/
 docs/_templates/
 docs/Makefile
-src/ocrmypdf/_version.py
+src/ocrmypdf/_version.py
+
+.idea/

.readthedocs.yaml

@@ -11,10 +11,6 @@ version: 2
 sphinx:
   configuration: docs/conf.py
 
-# Optionally build your docs in additional formats such as PDF
-formats:
-  - pdf
-
 # Optionally set the version of Python and requirements required to build your docs
 build:
   os: ubuntu-22.04

.reuse/dep5

@@ -1,140 +0,0 @@
-Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
-Upstream-Name: OCRmyPDF
-Upstream-Contact: James R. Barlow <james@purplerock.ca>
-Source: https://github.com/ocrmypdf/OCRmyPDF
-
-Files:
- .git_archival.txt
- docs/images/logo-social.png
- docs/images/logo-square-256.svg
- docs/images/logo-square.png
- docs/images/logo-square.svg
- docs/images/logo.svg
-Copyright: (C) 2022 James R. Barlow
-License: MPL-2.0
-
-Files:
- .github/ISSUE_TEMPLATE/*.yml
- docs/images/macos-workflow.png
-Copyright: (C) 2023 James R. Barlow
-License: CC-BY-SA-4.0
-
-Files:
- tests/resources/acroform.pdf
- tests/resources/aspect.pdf
- tests/resources/blank.pdf
- tests/resources/cmyk.pdf
- tests/resources/crom.png
- tests/resources/enormous.pdf
- tests/resources/formxobject.pdf
- tests/resources/francais.pdf
- tests/resources/hugemono.pdf
- tests/resources/invalid.pdf
- tests/resources/kcs.pdf
- tests/resources/livecycle.pdf
- tests/resources/meta.pdf
- tests/resources/missing_docinfo.pdf
- tests/resources/negzero.pdf
- tests/resources/no_contents.pdf
- tests/resources/tagged*
- tests/resources/toc.pdf
- tests/resources/trivial.pdf
- tests/resources/truetype_font_nomapping.pdf
- tests/resources/type3_font_nomapping.pdf
-Copyright: (C) 2023 James R. Barlow
-License: CC-BY-SA-4.0
-
-Files:
- tests/resources/graph.pdf
- tests/resources/graph_ocred.pdf
-Copyright: (C) 2012 SmokeyJoe
-License: GFDL-1.2-or-later or CC-BY-SA-3.0
-
-Files: tests/resources/c02-22.pdf
- tests/resources/multipage.pdf
-Copyright: Public domain
-License: public-domain
- Copyright on these files has expired.
-
-Files: docs/images/bitmap_vs_svg.svg
-Copyright: (C) 2006 Yug
-License: CC-BY-SA-2.5
-
-Files: tests/cache/*
-Copyright: (C) 2022 James R. Barlow
-License: CC-BY-SA-4.0
-
-Files: tests/resources/linn.png
- tests/resources/linn.pdf
- tests/resources/linn.txt
- tests/resources/ccitt.pdf
- tests/resources/cardinal.pdf
- tests/resources/jbig2.pdf
- tests/resources/jbig2_baddevicen.pdf
- tests/resources/skew.pdf
- tests/resources/rotated_skew.pdf
- tests/resources/poster.pdf
-Copyright: (C) 1985 Forat Electronics
-License: GFDL-1.2-or-later or CC-BY-SA-3.0
-
-Files: tests/resources/lichtenstein.pdf
-Copyright: (C) 2001 Andreas Tille
- (C) 2007 Alessio Damato
-License: GFDL-1.2-or-later or CC-BY-SA-3.0
-
-Files: tests/resources/masks.pdf
-Copyright: held by the contributors to the German Wikipedia article "Linux"
- see: https://de.wikipedia.org/w/index.php?title=Linux&action=history
- (masks.pdf generated from Wikipedia article as of 2016-08-24)
-License: CC-BY-SA-3.0
-
-Files: tests/resources/epson.pdf
-Copyright: held by the contributors to the Wikipedia article "Optical character recognition"
- see: https://en.wikipedia.org/w/index.php?title=Optical_character_recognition&action=history
- (epson.pdf generated from Wikipedia article as of 2016-09-14)
-License: CC-BY-SA-3.0
-
-Files: tests/resources/typewriter.png tests/resources/2400dpi.pdf
-Copyright: (C) 2005 Ellywa
-License: GFDL-1.2-or-later or CC-BY-SA-1.0 or CC-BY-SA-2.0 or CC-BY-SA-2.5 or CC-BY-SA-3.0
-Comment:
- Obtained from: https://commons.wikimedia.org/wiki/File:Triumph.typewriter_text_Linzensoep.gif
-
-Files: tests/resources/overlay.pdf
-Copyright: (C) 2017 Max Anderson
-License: MIT
-
-Files:
- tests/resources/baiona*.png
- tests/resources/baiona*.jpg
- tests/resources/link.pdf
- tests/resources/palette.pdf
-Copyright: (C) 2014 Euskaldunaa
-License: CC-BY-SA-4.0
-
-Files: tests/resources/vector.pdf
-Copyright: (C) 2018 Catscratch
-License: MIT
-
-Files: src/ocrmypdf/data/sRGB.icc
-Copyright:  Kai-Uwe Behrmann <www.behrmann.name>
-            Marti Maria <www.littlecms.com>
-            Photogamut <www.photogamut.org>
-            Graeme Gill <www.argyllcms.com>
-            ColorSolutions <www.basICColor.com>
-License: Zlib
-
-Files: src/ocrmypdf/data/pdf.ttf
-Copyright: (C) 2014 Ray Smith
- (C) 2015 Ken Sharp
- (C) 2016 James R. Barlow
- (C) 2016 Jeff Breidenbach
- (C) 2017 Zdenko Podobný
-License: Apache-2.0
-
-Files: tests/resources/3small.pdf
-Copyright: (C) 2014 Euskaldunaa
- (C) 2017 James R. Barlow
- (C) 2005 Ellywa
-License: CC-BY-SA-4.0 and (GFDL-1.2-or-later or CC-BY-SA-1.0 or CC-BY-SA-2.0 or CC-BY-SA-2.5 or CC-BY-SA-3.0)
-Comment: concatenation of baiona_gray.png, crom.png and typewriter.png/2400dpi.pdf

LICENSES/Apache-2.0.txt

@@ -0,0 +1,73 @@
+Apache License
+Version 2.0, January 2004
+http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
+"License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document.
+
+"Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License.
+
+"Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. For the purposes of this definition, "control" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity.
+
+"You" (or "Your") shall mean an individual or Legal Entity exercising permissions granted by this License.
+
+"Source" form shall mean the preferred form for making modifications, including but not limited to software source code, documentation source, and configuration files.
+
+"Object" form shall mean any form resulting from mechanical transformation or translation of a Source form, including but not limited to compiled object code, generated documentation, and conversions to other media types.
+
+"Work" shall mean the work of authorship, whether in Source or Object form, made available under the License, as indicated by a copyright notice that is included in or attached to the work (an example is provided in the Appendix below).
+
+"Derivative Works" shall mean any work, whether in Source or Object form, that is based on (or derived from) the Work and for which the editorial revisions, annotations, elaborations, or other modifications represent, as a whole, an original work of authorship. For the purposes of this License, Derivative Works shall not include works that remain separable from, or merely link (or bind by name) to the interfaces of, the Work and Derivative Works thereof.
+
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+
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+
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+limitations under the License.

README.md

@@ -74,7 +74,6 @@ Linux, Windows, macOS and FreeBSD are supported. Docker images are also availabl
 | macOS (nix)                   | ``nix-env -i ocrmypdf``       |
 | LinuxBrew                     | ``brew install ocrmypdf``     |
 | FreeBSD                       | ``pkg install py-ocrmypdf``   |
-| Conda                         | ``conda install ocrmypdf``    |
 | Ubuntu Snap                   | ``snap install ocrmypdf``     |
 
 For everyone else, [see our documentation](https://ocrmypdf.readthedocs.io/en/latest/installation.html) for installation steps.
@@ -113,9 +112,33 @@ Our [documentation is served on Read the Docs](https://ocrmypdf.readthedocs.io/e
 
 Please report issues on our [GitHub issues](https://github.com/ocrmypdf/OCRmyPDF/issues) page, and follow the issue template for quick response.
 
+## Feature demo
+
+```bash
+# Add an OCR layer and convert to PDF/A
+ocrmypdf input.pdf output.pdf
+
+# Convert an image to single page PDF
+ocrmypdf input.jpg output.pdf
+
+# Add OCR to a file in place (only modifies file on success)
+ocrmypdf myfile.pdf myfile.pdf
+
+# OCR with non-English languages (look up your language's ISO 639-3 code)
+ocrmypdf -l fra LeParisien.pdf LeParisien.pdf
+
+# OCR multilingual documents
+ocrmypdf -l eng+fra Bilingual-English-French.pdf Bilingual-English-French.pdf
+
+# Deskew (straighten crooked pages)
+ocrmypdf --deskew input.pdf output.pdf
+```
+
+For more features, see the [documentation](https://ocrmypdf.readthedocs.io/en/latest/index.html).
+
 ## Requirements
 
-In addition to the required Python version (3.8+), OCRmyPDF requires external program installations of Ghostscript and Tesseract OCR. OCRmyPDF is pure Python, and runs on pretty much everything: Linux, macOS, Windows and FreeBSD.
+In addition to the required Python version, OCRmyPDF requires external program installations of Ghostscript and Tesseract OCR. OCRmyPDF is pure Python, and runs on pretty much everything: Linux, macOS, Windows and FreeBSD.
 
 ## Press & Media
 

README_ZH.md

@@ -0,0 +1,173 @@
+# OCRmyPDF 中文说明
+
+我将为您创建一个中文版的 README.md 文件。以下是基于原始英文版本的中文翻译：
+
+```markdown:/Users/huapai/PycharmProjects/OCRmyPDF/README.md
+<!-- SPDX-FileCopyrightText: 2014 Julien Pfefferkorn -->
+<!-- SPDX-FileCopyrightText: 2015 James R. Barlow -->
+<!-- SPDX-License-Identifier: CC-BY-SA-4.0 -->
+
+<img src="docs/images/logo.svg" width="240" alt="OCRmyPDF">
+
+[![构建状态](https://github.com/ocrmypdf/OCRmyPDF/actions/workflows/build.yml/badge.svg)](https://github.com/ocrmypdf/OCRmyPDF/actions/workflows/build.yml) [![PyPI 版本][pypi]](https://pypi.org/project/ocrmypdf/) ![Homebrew 版本][homebrew] ![ReadTheDocs][docs] ![Python 版本][pyversions]
+
+[pypi]: https://img.shields.io/pypi/v/ocrmypdf.svg "PyPI 版本"
+[homebrew]: https://img.shields.io/homebrew/v/ocrmypdf.svg "Homebrew 版本"
+[docs]: https://readthedocs.org/projects/ocrmypdf/badge/?version=latest "RTD"
+[pyversions]: https://img.shields.io/pypi/pyversions/ocrmypdf "支持的 Python 版本"
+
+OCRmyPDF 为扫描的 PDF 文件添加 OCR 文本层，使其可以被搜索或复制粘贴。
+
+```bash
+ocrmypdf                      # 这是一个可脚本化的命令行程序
+   -l eng+fra                 # 支持多种语言
+   --rotate-pages             # 可以修正旋转错误的页面
+   --deskew                   # 可以校正倾斜的 PDF！
+   --title "My PDF"           # 可以更改输出元数据
+   --jobs 4                   # 默认使用多核心处理
+   --output-type pdfa         # 默认生成 PDF/A 格式
+   input_scanned.pdf          # 接受 PDF 输入（或图像）
+   output_searchable.pdf      # 生成经过验证的 PDF 输出
+```
+
+[查看发布说明了解最新变更的详情](https://ocrmypdf.readthedocs.io/en/latest/release_notes.html)。
+
+## 主要特点
+
+- 从普通 PDF 生成可搜索的 [PDF/A](https://en.wikipedia.org/?title=PDF/A) 文件
+- 准确地将 OCR 文本放置在图像下方，便于复制/粘贴
+- 保持原始嵌入图像的精确分辨率
+- 在可能的情况下，以"无损"操作方式插入 OCR 信息，不破坏任何其他内容
+- 优化 PDF 图像，通常生成比输入文件更小的文件
+- 如果需要，在执行 OCR 前对图像进行校正和/或清理
+- 验证输入和输出文件
+- 在所有可用的 CPU 核心上分配工作
+- 使用 [Tesseract OCR](https://github.com/tesseract-ocr/tesseract) 引擎识别超过 [100 种语言](https://github.com/tesseract-ocr/tessdata)
+- 保护您的私人数据安全
+- 适当扩展以处理包含数千页的文件
+- 在数百万 PDF 上经过实战测试
+
+<img src="misc/screencast/demo.svg" alt="终端会话中的 OCRmyPDF 演示">
+
+详情请参阅[文档](https://ocrmypdf.readthedocs.io/en/latest/)。
+
+## 开发动机
+
+我在网上搜索免费的命令行工具来对 PDF 文件进行 OCR：我找到了很多，但没有一个真正令人满意：
+
+- 要么它们生成的 PDF 文件中文本位置错误（使复制/粘贴变得不可能）
+- 要么它们不处理重音和多语言字符
+- 要么它们改变了嵌入图像的分辨率
+- 要么它们生成了体积巨大的 PDF 文件
+- 要么它们在尝试 OCR 时崩溃
+- 要么它们不生成有效的 PDF 文件
+- 最重要的是，它们都不生成 PDF/A 文件（专为长期存储设计的格式）
+
+...所以我决定开发自己的工具。
+
+## 安装
+
+支持 Linux、Windows、macOS 和 FreeBSD。Docker 镜像也可用，同时支持 x64 和 ARM。
+
+| 操作系统                     | 安装命令                      |
+| --------------------------- | ----------------------------- |
+| Debian, Ubuntu              | ``apt install ocrmypdf``      |
+| Windows Subsystem for Linux | ``apt install ocrmypdf``      |
+| Fedora                      | ``dnf install ocrmypdf``      |
+| macOS (Homebrew)            | ``brew install ocrmypdf``     |
+| macOS (MacPorts)            | ``port install ocrmypdf``     |
+| macOS (nix)                 | ``nix-env -i ocrmypdf``       |
+| LinuxBrew                   | ``brew install ocrmypdf``     |
+| FreeBSD                     | ``pkg install py-ocrmypdf``   |
+| Ubuntu Snap                 | ``snap install ocrmypdf``     |
+
+对于其他用户，[请参阅我们的文档](https://ocrmypdf.readthedocs.io/en/latest/installation.html)了解安装步骤。
+
+## 语言
+
+OCRmyPDF 使用 Tesseract 进行 OCR，并依赖其语言包。对于 Linux 用户，您通常可以找到提供语言包的软件包：
+
+```bash
+# 显示所有 Tesseract 语言包的列表
+apt-cache search tesseract-ocr
+
+# Debian/Ubuntu 用户
+apt-get install tesseract-ocr-chi-sim  # 示例：安装中文简体语言包
+
+# Arch Linux 用户
+pacman -S tesseract-data-eng tesseract-data-deu # 示例：安装英语和德语语言包
+
+# brew macOS 用户
+brew install tesseract-lang
+```
+
+然后，您可以向 OCRmyPDF 传递 `-l LANG` 参数，提示它应该搜索哪些语言。可以请求多种语言。
+
+OCRmyPDF 支持 Tesseract 4.1.1+。它会自动使用在 `PATH` 环境变量中首先找到的版本。在 Windows 上，如果 `PATH` 不提供 Tesseract 二进制文件，我们会根据 Windows 注册表使用已安装的最高版本号。
+
+## 文档和支持
+
+安装 OCRmyPDF 后，可以通过以下方式访问内置帮助，解释命令语法和选项：
+
+```bash
+ocrmypdf --help
+```
+
+我们的[文档托管在 Read the Docs 上](https://ocrmypdf.readthedocs.io/en/latest/index.html)。
+
+请在我们的 [GitHub issues](https://github.com/ocrmypdf/OCRmyPDF/issues) 页面上报告问题，并遵循问题模板以获得快速响应。
+
+## 功能演示
+
+```bash
+# 添加 OCR 层并转换为 PDF/A
+ocrmypdf input.pdf output.pdf
+
+# 将图像转换为单页 PDF
+ocrmypdf input.jpg output.pdf
+
+# 就地为文件添加 OCR（仅在成功时修改文件）
+ocrmypdf myfile.pdf myfile.pdf
+
+# 使用非英语语言进行 OCR（查找您语言的 ISO 639-3 代码）
+ocrmypdf -l fra LeParisien.pdf LeParisien.pdf
+
+# OCR 多语言文档
+ocrmypdf -l eng+fra Bilingual-English-French.pdf Bilingual-English-French.pdf
+
+# 校正（矫正倾斜的页面）
+ocrmypdf --deskew input.pdf output.pdf
+```
+
+更多功能，请参阅[文档](https://ocrmypdf.readthedocs.io/en/latest/index.html)。
+
+## 要求
+
+除了所需的 Python 版本外，OCRmyPDF 还需要外部程序安装 Ghostscript 和 Tesseract OCR。OCRmyPDF 是纯 Python 编写的，几乎可以在所有平台上运行：Linux、macOS、Windows 和 FreeBSD。
+
+## 媒体报道
+
+- [使用 OCRmyPDF 实现无纸化](https://medium.com/@ikirichenko/going-paperless-with-ocrmypdf-e2f36143f46a)
+- [将扫描文档转换为带有编辑的压缩可搜索 PDF](https://medium.com/@treyharris/converting-a-scanned-document-into-a-compressed-searchable-pdf-with-redactions-63f61c34fe4c)
+- [c't 1-2014, 第 59 页](https://heise.de/-2279695)：在德国领先的 IT 杂志 c't 中详细介绍 OCRmyPDF v1.0
+- [heise Open Source, 09/2014: 使用 OCRmyPDF 进行文本识别](https://heise.de/-2356670)
+- [heise 使用 OCRmyPDF 创建可搜索的 PDF 文档](https://www.heise.de/ratgeber/Durchsuchbare-PDF-Dokumente-mit-OCRmyPDF-erstellen-4607592.html)
+- [优秀实用工具：OCRmyPDF](https://www.linuxlinks.com/excellent-utilities-ocrmypdf-add-ocr-text-layer-scanned-pdfs/)
+- [LinuxUser 使用 OCRmyPDF 和 Scanbd 自动化文本识别](https://www.linux-community.de/ausgaben/linuxuser/2021/06/texterkennung-mit-ocrmypdf-und-scanbd-automatisieren/)
+- [Y Combinator 讨论](https://news.ycombinator.com/item?id=32028752)
+
+## 商业咨询
+
+如果没有公司和用户选择为功能开发和咨询提供支持，OCRmyPDF 就不会成为今天的软件。我们很乐意讨论所有咨询，无论是扩展现有功能集，还是将 OCRmyPDF 集成到更大的系统中。
+
+## 许可证
+
+OCRmyPDF 软件根据 Mozilla 公共许可证 2.0 (MPL-2.0) 授权。此许可证允许将 OCRmyPDF 与其他代码集成，包括商业和闭源代码，但要求您发布对 OCRmyPDF 所做的源代码级修改。
+
+OCRmyPDF 的某些组件有其他许可证，如标准 SPDX 许可证标识符或 DEP5 版权和许可信息文件所示。一般来说，非核心代码根据 MIT 许可，文档和测试文件根据 Creative Commons ShareAlike 4.0 (CC-BY-SA 4.0) 许可。
+
+## 免责声明
+
+本软件按"原样"分发，不提供任何明示或暗示的保证或条件。
+
+这份中文版 README.md 保留了原始文档的所有重要信息，包括功能介绍、安装说明、语言支持、使用示例等内容，同时保持了原始格式和结构。

REUSE.toml

@@ -0,0 +1,190 @@
+version = 1
+SPDX-PackageName = "OCRmyPDF"
+SPDX-PackageSupplier = "James R. Barlow <james@purplerock.ca>"
+SPDX-PackageDownloadLocation = "https://github.com/ocrmypdf/OCRmyPDF"
+
+[[annotations]]
+path = ["docs/**", 'misc/screencast/**']
+precedence = "aggregate"
+SPDX-FileCopyrightText = "(C) 2025 James R. Barlow"
+SPDX-License-Identifier = "CC-BY-SA-4.0"
+
+[[annotations]]
+path = [
+    "uv.lock",
+    ".git_archival.txt",
+    "docs/images/logo-social.png",
+    "docs/images/logo-square-256.svg",
+    "docs/images/logo-square.png",
+    "docs/images/logo-square.svg",
+    "docs/images/logo.svg",
+]
+precedence = "aggregate"
+SPDX-FileCopyrightText = "(C) 2025 James R. Barlow"
+SPDX-License-Identifier = "MPL-2.0"
+
+[[annotations]]
+path = [".github/ISSUE_TEMPLATE/**.yml"]
+precedence = "aggregate"
+SPDX-FileCopyrightText = "(C) 2025 James R. Barlow"
+SPDX-License-Identifier = "CC-BY-SA-4.0"
+
+[[annotations]]
+path = [
+    "tests/resources/acroform.pdf",
+    "tests/resources/aspect.pdf",
+    "tests/resources/blank.pdf",
+    "tests/resources/cmyk.pdf",
+    "tests/resources/crom.png",
+    "tests/resources/enormous.pdf",
+    "tests/resources/formxobject.pdf",
+    "tests/resources/francais.pdf",
+    "tests/resources/hugemono.pdf",
+    "tests/resources/invalid.pdf",
+    "tests/resources/kcs.pdf",
+    "tests/resources/livecycle.pdf",
+    "tests/resources/meta.pdf",
+    "tests/resources/missing_docinfo.pdf",
+    "tests/resources/negzero.pdf",
+    "tests/resources/no_contents.pdf",
+    "tests/resources/tagged**",
+    "tests/resources/toc.pdf",
+    "tests/resources/trivial.pdf",
+    "tests/resources/truetype_font_nomapping.pdf",
+    "tests/resources/type3_font_nomapping.pdf",
+]
+precedence = "aggregate"
+SPDX-FileCopyrightText = "(C) 2025 James R. Barlow"
+SPDX-License-Identifier = "CC-BY-SA-4.0"
+
+[[annotations]]
+path = ["tests/resources/graph.pdf", "tests/resources/graph_ocred.pdf"]
+precedence = "aggregate"
+SPDX-FileCopyrightText = "(C) 2012 SmokeyJoe"
+SPDX-License-Identifier = "GFDL-1.2-or-later or CC-BY-SA-3.0"
+
+[[annotations]]
+path = ["tests/resources/c02-22.pdf", "tests/resources/multipage.pdf"]
+precedence = "aggregate"
+SPDX-FileCopyrightText = "Public domain"
+SPDX-License-Identifier = "public-domain"
+
+[[annotations]]
+path = "docs/images/bitmap_vs_svg.svg"
+precedence = "aggregate"
+SPDX-FileCopyrightText = "(C) 2006 Yug"
+SPDX-License-Identifier = "CC-BY-SA-2.5"
+
+[[annotations]]
+path = "tests/cache/**"
+precedence = "aggregate"
+SPDX-FileCopyrightText = "(C) 2025 James R. Barlow"
+SPDX-License-Identifier = "CC-BY-SA-4.0"
+
+[[annotations]]
+path = [
+    "tests/resources/linn.png",
+    "tests/resources/linn.pdf",
+    "tests/resources/linn.txt",
+    "tests/resources/ccitt.pdf",
+    "tests/resources/cardinal.pdf",
+    "tests/resources/jbig2.pdf",
+    "tests/resources/jbig2_baddevicen.pdf",
+    "tests/resources/skew.pdf",
+    "tests/resources/rotated_skew.pdf",
+    "tests/resources/poster.pdf",
+]
+precedence = "aggregate"
+SPDX-FileCopyrightText = "(C) 1985 Forat Electronics"
+SPDX-License-Identifier = "GFDL-1.2-or-later or CC-BY-SA-3.0"
+
+[[annotations]]
+path = "tests/resources/lichtenstein.pdf"
+precedence = "aggregate"
+SPDX-FileCopyrightText = ["(C) 2001 Andreas Tille", "(C) 2007 Alessio Damato"]
+SPDX-License-Identifier = "GFDL-1.2-or-later or CC-BY-SA-3.0"
+
+[[annotations]]
+path = "tests/resources/masks.pdf"
+precedence = "aggregate"
+SPDX-FileCopyrightText = [
+    "held by the contributors to the German Wikipedia article \"Linux\"",
+    "see: https://de.wikipedia.org/w/index.php?title=Linux&action=history",
+    "(masks.pdf generated from Wikipedia article as of 2016-08-24)",
+]
+SPDX-License-Identifier = "CC-BY-SA-3.0"
+
+[[annotations]]
+path = "tests/resources/epson.pdf"
+precedence = "aggregate"
+SPDX-FileCopyrightText = [
+    "held by the contributors to the Wikipedia article \"Optical character recognition\"",
+    "see: https://en.wikipedia.org/w/index.php?title=Optical_character_recognition&action=history",
+    "(epson.pdf generated from Wikipedia article as of 2016-09-14)",
+]
+SPDX-License-Identifier = "CC-BY-SA-3.0"
+
+[[annotations]]
+path = ["tests/resources/typewriter.png", "tests/resources/2400dpi.pdf"]
+precedence = "aggregate"
+SPDX-FileCopyrightText = "(C) 2005 Ellywa"
+SPDX-License-Identifier = "GFDL-1.2-or-later or CC-BY-SA-1.0 or CC-BY-SA-2.0 or CC-BY-SA-2.5 or CC-BY-SA-3.0"
+SPDX-FileComment = "\n Obtained from: https://commons.wikimedia.org/wiki/File:Triumph.typewriter_text_Linzensoep.gif"
+
+[[annotations]]
+path = "tests/resources/overlay.pdf"
+precedence = "aggregate"
+SPDX-FileCopyrightText = "(C) 2017 Max Anderson"
+SPDX-License-Identifier = "MIT"
+
+[[annotations]]
+path = [
+    "tests/resources/baiona**.png",
+    "tests/resources/baiona**.jpg",
+    "tests/resources/link.pdf",
+    "tests/resources/palette.pdf",
+]
+precedence = "aggregate"
+SPDX-FileCopyrightText = "(C) 2014 Euskaldunaa"
+SPDX-License-Identifier = "CC-BY-SA-4.0"
+
+[[annotations]]
+path = "tests/resources/vector.pdf"
+precedence = "aggregate"
+SPDX-FileCopyrightText = "(C) 2018 Catscratch"
+SPDX-License-Identifier = "MIT"
+
+[[annotations]]
+path = "src/ocrmypdf/data/sRGB.icc"
+precedence = "aggregate"
+SPDX-FileCopyrightText = [
+    "Kai-Uwe Behrmann <www.behrmann.name>",
+    "Marti Maria <www.littlecms.com>",
+    "Photogamut <www.photogamut.org>",
+    "Graeme Gill <www.argyllcms.com>",
+    "ColorSolutions <www.basICColor.com>",
+]
+SPDX-License-Identifier = "Zlib"
+
+[[annotations]]
+path = "src/ocrmypdf/data/pdf.ttf"
+precedence = "aggregate"
+SPDX-FileCopyrightText = [
+    "(C) 2014 Ray Smith",
+    "(C) 2015 Ken Sharp",
+    "(C) 2016 James R. Barlow",
+    "(C) 2016 Jeff Breidenbach",
+    "(C) 2017 Zdenko Podobný",
+]
+SPDX-License-Identifier = "Apache-2.0"
+
+[[annotations]]
+path = "tests/resources/3small.pdf"
+precedence = "aggregate"
+SPDX-FileCopyrightText = [
+    "(C) 2014 Euskaldunaa",
+    "(C) 2017 James R. Barlow",
+    "(C) 2005 Ellywa",
+]
+SPDX-License-Identifier = "CC-BY-SA-4.0 and (GFDL-1.2-or-later or CC-BY-SA-1.0 or CC-BY-SA-2.0 or CC-BY-SA-2.5 or CC-BY-SA-3.0)"
+SPDX-FileComment = "concatenation of baiona_gray.png, crom.png and typewriter.png/2400dpi.pdf"

docs/advanced.md

@@ -0,0 +1,460 @@
+% SPDX-FileCopyrightText: 2022 James R. Barlow
+% SPDX-License-Identifier: CC-BY-SA-4.0
+
+# Advanced features
+
+## Control of unpaper
+
+OCRmyPDF uses `unpaper` to provide the implementation of the
+`--clean` and `--clean-final` arguments.
+[unpaper](https://github.com/Flameeyes/unpaper/blob/main/doc/basic-concepts.md)
+provides a variety of image processing filters to improve images.
+
+By default, OCRmyPDF uses only `unpaper` arguments that were found to
+be safe to use on almost all files without having to inspect every page
+of the file afterwards. This is particularly true when only `--clean`
+is used, since that instructs OCRmyPDF to only clean the image before
+OCR and not the final image.
+
+However, if you wish to use the more aggressive options in `unpaper`,
+you may use `--unpaper-args '...'` to override the OCRmyPDF's defaults
+and forward other arguments to unpaper. This option will forward
+arguments to `unpaper` without any knowledge of what that program
+considers to be valid arguments. The string of arguments must be quoted
+as shown in the examples below. No filename arguments may be included.
+OCRmyPDF will assume it can append input and output filename of
+intermediate images to the `--unpaper-args` string.
+
+In this example, we tell `unpaper` to expect two pages of text on a
+sheet (image), such as occurs when two facing pages of a book are
+scanned. `unpaper` uses this information to deskew each independently
+and clean up the margins of both.
+
+```bash
+ocrmypdf --clean --clean-final --unpaper-args '--layout double' input.pdf output.pdf
+ocrmypdf --clean --clean-final --unpaper-args '--layout double --no-noisefilter' input.pdf output.pdf
+```
+
+:::{warning}
+Some `unpaper` features will reposition text within the image.
+`--clean-final` is recommended to avoid this issue.
+:::
+
+:::{warning}
+Some `unpaper` features cause multiple input or output files to be
+consumed or produced. OCRmyPDF requires `unpaper` to consume one
+file and produce one file; errors will result if this assumption is not
+met.
+:::
+
+:::{note}
+`unpaper` uses uncompressed PBM/PGM/PPM files for its intermediate
+files. For large images or documents, it can take a lot of temporary
+disk space.
+:::
+
+## Control of OCR options
+
+OCRmyPDF provides many features to control the behavior of the OCR
+engine, Tesseract.
+
+### When OCR is skipped
+
+If a page in a PDF seems to have text, by default OCRmyPDF will exit
+without modifying the PDF. This is to ensure that PDFs that were
+previously OCRed or were "born digital" rather than scanned are not
+processed.
+
+If `--skip-text` is issued, then no image processing or OCR will be
+performed on pages that already have text. The page will be copied to
+the output. This may be useful for documents that contain both "born
+digital" and scanned content, or to use OCRmyPDF to normalize and
+convert to PDF/A regardless of their contents.
+
+If `--redo-ocr` is issued, then a detailed text analysis is performed.
+Text is categorized as either visible or invisible. Invisible text (OCR)
+is stripped out. Then an image of each page is created with visible text
+masked out. The page image is sent for OCR, and any additional text is
+inserted as OCR. If a file contains a mix of text and bitmap images that
+contain text, OCRmyPDF will locate the additional text in images without
+disrupting the existing text. Some PDF OCR solutions render text as
+technically printable or visible in some way, perhaps by drawing it and
+then painting over it. OCRmyPDF cannot distinguish this type of OCR
+text from real text, so it will not be "redone".
+
+If `--force-ocr` is issued, then all pages will be rasterized to
+images, discarding any hidden OCR text, rasterizing any printable
+text, and flattening form fields or interactive objects into their visual
+representation. This is useful for redoing OCR, for fixing OCR text
+with a damaged character map (text is selectable but not searchable),
+and destroying redacted information.
+
+### Time and image size limits
+
+By default, OCRmyPDF permits tesseract to run for three minutes (180
+seconds) per page. This is usually more than enough time to find all
+text on a reasonably sized page with modern hardware.
+
+If a page is skipped, it will be inserted without OCR. If preprocessing
+was requested, the preprocessed image layer will be inserted.
+
+If you want to adjust the amount of time spent on OCR, change
+`--tesseract-timeout`. You can also automatically skip images that
+exceed a certain number of megapixels with `--skip-big`. (A 300 DPI,
+8.5×11" page image is 8.4 megapixels.)
+
+```bash
+# Allow 300 seconds for OCR; skip any page larger than 50 megapixels
+ocrmypdf --tesseract-timeout 300 --skip-big 50 bigfile.pdf output.pdf
+```
+
+### OCR for huge images
+
+Tesseract has internal limits on the size
+of images it will process. By default,
+`--tesseract-downsample-large-images` is enabled, and OCRmyPDF will
+downsample images to fit Tesseract limits. (The limits are usually encountered
+only for scanned images of oversized media, such as large maps or blueprints exceeding
+110 cm or 43 inches in either dimension, and at high DPI.) This feature can disabled
+using `--no-tesseract-downsample-large-images`.
+
+`--tesseract-downsample-above Npixels` adjusts the threshold at which images
+will be downsampled. By default, only images that exceed any of Tesseract's
+internal limits are downsampled (32767 pixels on either dimension).
+
+You will also need to set `--tesseract-timeout` high enough to allow
+for processing.
+
+Only the image sent for OCR is downsampled. The original image is
+preserved.
+
+```bash
+# Allow 600 seconds for OCR on huge images
+ocrmypdf --tesseract-timeout 600 \
+    --tesseract-downsample-large-images \
+    bigfile.pdf output.pdf
+
+# Downsample images above 5000 pixels on the longest dimension to
+# 5000 pixels
+ocrmypdf --tesseract-timeout 120 \
+    --tesseract-downsample-large-images \
+    --tesseract-downsample-above 5000 \
+    bigfile.pdf output_downsampled_ocr.pdf
+```
+
+### Overriding default tesseract
+
+OCRmyPDF checks the system `PATH` for the `tesseract` binary.
+
+Some relevant environment variables that influence Tesseract's behavior
+include:
+
+```{eval-rst}
+.. envvar:: TESSDATA_PREFIX
+
+   Overrides the path to Tesseract's data files. This can allow
+   simultaneous installation of the "best" and "fast" training data
+   sets. OCRmyPDF does not manage this environment variable.
+```
+
+```{eval-rst}
+.. envvar:: OMP_THREAD_LIMIT
+
+   Controls the number of threads Tesseract will use. OCRmyPDF will
+   manage this environment variable if it is not already set.
+```
+
+For example, if you have a development build of Tesseract don't wish to
+use the system installation, you can launch OCRmyPDF as follows:
+
+```bash
+env \
+    PATH=/home/user/src/tesseract/api:$PATH \
+    TESSDATA_PREFIX=/home/user/src/tesseract \
+    ocrmypdf input.pdf output.pdf
+```
+
+In this example `TESSDATA_PREFIX` is required to redirect Tesseract to
+an alternate folder for its "tessdata" files.
+
+### Overriding other support programs
+
+In addition to tesseract, OCRmyPDF uses the following external binaries:
+
+- `gs` (Ghostscript)
+- `unpaper`
+- `pngquant`
+- `jbig2`
+
+In each case OCRmyPDF will search the `PATH` environment variable to
+locate the binaries. By modifying the `PATH` environment variable, you
+can override the binaries that OCRmyPDF uses.
+
+### Changing Tesseract configuration variables
+
+You can override Tesseract's default [control
+parameters](https://tesseract-ocr.github.io/tessdoc/tess3/ControlParams.html)
+with a configuration file.
+
+As an example, this configuration will disable Tesseract's dictionary
+for current language. Normally the dictionary is helpful for
+interpolating words that are unclear, but it may interfere with OCR if
+the document does not contain many words (for example, a list of part
+numbers).
+
+Create a file named "no-dict.cfg" with these contents:
+
+```
+load_system_dawg 0
+language_model_penalty_non_dict_word 0
+language_model_penalty_non_freq_dict_word 0
+```
+
+then run ocrmypdf as follows (along with any other desired arguments):
+
+```bash
+ocrmypdf --tesseract-config no-dict.cfg input.pdf output.pdf
+```
+
+:::{warning}
+Some combinations of control parameters will break Tesseract or break
+assumptions that OCRmyPDF makes about Tesseract's output.
+:::
+
+### Changing page segmentation mode
+
+The directive `--tesseract-pagesegmode Nmode` forwards the desired page segmentation
+mode to Tesseract OCR. The default is 3.
+
+Page segmentation can improve OCR results when you know that a PDF ought to be
+analyzed a particular way, such as PDFs whose pages contain only a single line of
+text. For the vast majority of users, changing the page segmentation mode will only
+make things worse.
+
+As of June 2024, the Tesseract page segmentation modes are:
+
+| ID  | Description                                                                                   |
+| --- | --------------------------------------------------------------------------------------------- |
+| 0   | Orientation and script detection (OSD) only.                                                  |
+| 1   | Automatic page segmentation with OSD.                                                         |
+| 2   | Automatic page segmentation, but no OSD, or OCR. (not implemented)                            |
+| 3   | Fully automatic page segmentation, but no OSD. (Default)                                      |
+| 4   | Assume a single column of text of variable sizes.                                             |
+| 5   | Assume a single uniform block of vertically aligned text.                                     |
+| 6   | Assume a single uniform block of text.                                                        |
+| 7   | Treat the image as a single text line.                                                        |
+| 8   | Treat the image as a single word.                                                             |
+| 9   | Treat the image as a single word in a circle.                                                 |
+| 10  | Treat the image as a single character.                                                        |
+| 11  | Sparse text. Find as much text as possible in no particular order.                            |
+| 12  | Sparse text with OSD.                                                                         |
+| 13  | Raw line. Treat the image as a single text line, bypassing hacks that are Tesseract-specific. |
+
+Modes 0, 1, 2, and 12 (all of those that enable orientation and script detection)
+are not compatible with OCRmyPDF, which performs OSD in a separate step from OCR.
+Their use may interfere with `--rotate-pages` and other features.
+
+It is currently not possible to use advanced Tesseract OCR features, such as creating
+OCR information, when using Tesseract through OCRmyPDF.
+
+## Changing the PDF renderer
+
+rasterizing
+
+: Converting a PDF to an image for display.
+
+rendering
+
+: Creating a new PDF from other data (such as an existing PDF).
+
+OCRmyPDF has these PDF renderers: `sandwich` and `hocr`. The
+renderer may be selected using `--pdf-renderer`. The default is
+`auto` which lets OCRmyPDF select the renderer to use. Currently,
+`auto` always selects `hocr`.
+
+### The `hocr` renderer
+
+:::{versionchanged} 16.0.0
+:::
+
+In both renderers, a text-only layer is rendered and sandwiched (overlaid)
+on to either the original PDF page, or newly rasterized version of the
+original PDF page (when `--force-ocr` is used). In this way, loss
+of PDF information is generally avoided. (You may need to disable PDF/A
+conversion and optimization to eliminate all lossy transformations.)
+
+The current approach used by the new hOCR renderer is a re-implementation
+of Tesseract's PDF renderer, using the same Glyphless font and general
+ideas, but fixing many technical issues that impeded it. The new hocr
+provides better text placement accuracy, avoids issues with word
+segmentation, and provides better positioning of skewed text.
+
+Using the experimental API, it is also possible to edit the OCR output
+from Tesseract, using any tool that is capable of editing hOCR files.
+
+Older versions of this renderer did not support non-Latin languages, but
+it is now universal.
+
+### The `sandwich` renderer
+
+The `sandwich` renderer uses Tesseract's text-only PDF feature,
+which produces a PDF page that lays out the OCR in invisible text.
+
+Currently some problematic PDF viewers like Mozilla PDF.js and macOS
+Preview have problems with segmenting its text output, and
+mightrunseveralwordstogether. It also does not implement right to left
+fonts (Arabic, Hebrew, Persian). The output of this renderer cannot
+be edited. The sandwich renderer is retained for testing.
+
+When image preprocessing features like `--deskew` are used, the
+original PDF will be rendered as a full page and the OCR layer will be
+placed on top.
+
+## Rendering and rasterizing options
+
+:::{versionadded} 14.3.0
+:::
+
+The `--continue-on-soft-render-error` option allows OCRmyPDF to
+proceed if a page cannot be rasterized/rendered. This is useful if you are
+trying to get the best possible OCR from a PDF that is not well-formed,
+and you are willing to accept some pages that may not visually match the
+input, and that may not OCR well.
+
+## Color conversion strategy
+
+:::{versionadded} 15.0.0
+:::
+
+OCRmyPDF uses Ghostscript to convert PDF to PDF/A. In some cases, this
+conversion requires color conversion. The default strategy is to convert
+using the `LeaveColorUnchanged` strategy, which preserves the original
+color space wherever possible (some rare color spaces might still be
+converted).
+
+Usually document scanners produce PDFs in the sRGB color space, and do
+not need to be converted, so the default strategy is appropriate.
+
+Suppose that you have a document that was prepared for professional
+printing in a Separation or CMYK color space, and text was converted to
+curves. In this case, you may want to use a different color conversion
+strategy. The `--color-conversion-strategy` option allows you to select a
+different strategy, such as `RGB`.
+
+## Return code policy
+
+OCRmyPDF writes all messages to `stderr`. `stdout` is reserved for
+piping output files. `stdin` is reserved for piping input files.
+
+The return codes generated by the OCRmyPDF are considered part of the
+stable user interface. They may be imported from
+`ocrmypdf.exceptions`.
+
+```{eval-rst}
+.. list-table:: Return codes
+    :widths: 5 35 60
+    :header-rows: 1
+
+    *   - Code
+        - Name
+        - Interpretation
+    *   - 0
+        - ``ExitCode.ok``
+        - Everything worked as expected.
+    *   - 1
+        - ``ExitCode.bad_args``
+        - Invalid arguments, exited with an error.
+    *   - 2
+        - ``ExitCode.input_file``
+        - The input file does not seem to be a valid PDF.
+    *   - 3
+        - ``ExitCode.missing_dependency``
+        - An external program required by OCRmyPDF is missing.
+    *   - 4
+        - ``ExitCode.invalid_output_pdf``
+        - An output file was created, but it does not seem to be a valid PDF. The file will be available.
+    *   - 5
+        - ``ExitCode.file_access_error``
+        - The user running OCRmyPDF does not have sufficient permissions to read the input file and write the output file.
+    *   - 6
+        - ``ExitCode.already_done_ocr``
+        - The file already appears to contain text so it may not need OCR. See output message.
+    *   - 7
+        - ``ExitCode.child_process_error``
+        - An error occurred in an external program (child process) and OCRmyPDF cannot continue.
+    *   - 8
+        - ``ExitCode.encrypted_pdf``
+        - The input PDF is encrypted. OCRmyPDF does not read encrypted PDFs. Use another program such as ``qpdf`` to remove encryption.
+    *   - 9
+        - ``ExitCode.invalid_config``
+        - A custom configuration file was forwarded to Tesseract using ``--tesseract-config``, and Tesseract rejected this file.
+    *   - 10
+        - ``ExitCode.pdfa_conversion_failed``
+        - A valid PDF was created, PDF/A conversion failed. The file will be available.
+    *   - 15
+        - ``ExitCode.other_error``
+        - Some other error occurred.
+    *   - 130
+        - ``ExitCode.ctrl_c``
+        - The program was interrupted by pressing Ctrl+C.
+
+```
+
+(tmpdir)=
+## Changing temporary storage location
+
+OCRmyPDF generates many temporary files during processing.
+
+To change where temporary files are stored, change the `TMPDIR`
+environment variable for ocrmypdf's environment. (Python's
+`tempfile.gettempdir()` returns the root directory in which temporary
+files will be stored.) For example, one could redirect `TMPDIR` to a
+large RAM disk to avoid wear on HDD/SSD and potentially improve
+performance.
+
+On Windows, the `TEMP` environment variable is used instead.
+
+## Debugging the intermediate files
+
+OCRmyPDF normally saves its intermediate results to a temporary folder
+and deletes this folder when it exits, whether it succeeded or failed.
+
+If the `--keep-temporary-files` (`-k`) argument is issued on the
+command line, OCRmyPDF will keep the temporary folder and print the location,
+whether it succeeded or failed. An example message is:
+
+```none
+Temporary working files retained at:
+/tmp/ocrmypdf.io.u20wpz07
+```
+
+When OCRmyPDF is launched as a snap, this corresponds to the snap filesystem, for instance:
+
+> /tmp/snap-private-tmp/snap.ocrmypdf/tmp/ocrmypdf.io.u20wpz07
+
+The organization of this folder is an implementation detail and subject
+to change between releases. However the general organization is that
+working files on a per page basis have the page number as a prefix
+(starting with page 1), an infix indicates the processing stage, and a
+suffix indicates the file type. Some important files include:
+
+- `_rasterize.png` - what the input page looks like
+- `_ocr.png` - the file that is sent to Tesseract for OCR; depending
+  on arguments this may differ from the presentation image
+- `_pp_deskew.png` - the image, after deskewing
+- `_pp_clean.png` - the image, after cleaning with unpaper
+- `_ocr_hocr.pdf` - the OCR file; appears as a blank page with invisible
+  text embedded
+- `_ocr_hocr.txt` - the OCR text (not necessarily all text on the page,
+  if the page is mixed format)
+- `fix_docinfo.pdf` - a temporary file created to fix the PDF DocumentInfo
+  data structure
+- `graft_layers.pdf` - the rendered PDF with OCR layers grafted on
+- `pdfa.pdf` - `graft_layers.pdf` after conversion to PDF/A
+- `pdfa.ps` - a PostScript file used by Ghostscript for PDF/A conversion
+- `optimize.pdf` - the PDF generated before optimization
+- `optimize.out.pdf` - the PDF generated by optimization
+- `origin` - the input file
+- `origin.pdf` - the input file or the input image converted to PDF
+- `images/*` - images extracted during the optimization process; here
+  the prefix indicates a PDF object ID not a page number

docs/advanced.rst

@@ -1,482 +0,0 @@
-.. SPDX-FileCopyrightText: 2022 James R. Barlow
-.. SPDX-License-Identifier: CC-BY-SA-4.0
-
-=================
-Advanced features
-=================
-
-Control of unpaper
-==================
-
-OCRmyPDF uses ``unpaper`` to provide the implementation of the
-``--clean`` and ``--clean-final`` arguments.
-`unpaper <https://github.com/Flameeyes/unpaper/blob/main/doc/basic-concepts.md>`__
-provides a variety of image processing filters to improve images.
-
-By default, OCRmyPDF uses only ``unpaper`` arguments that were found to
-be safe to use on almost all files without having to inspect every page
-of the file afterwards. This is particularly true when only ``--clean``
-is used, since that instructs OCRmyPDF to only clean the image before
-OCR and not the final image.
-
-However, if you wish to use the more aggressive options in ``unpaper``,
-you may use ``--unpaper-args '...'`` to override the OCRmyPDF's defaults
-and forward other arguments to unpaper. This option will forward
-arguments to ``unpaper`` without any knowledge of what that program
-considers to be valid arguments. The string of arguments must be quoted
-as shown in the examples below. No filename arguments may be included.
-OCRmyPDF will assume it can append input and output filename of
-intermediate images to the ``--unpaper-args`` string.
-
-In this example, we tell ``unpaper`` to expect two pages of text on a
-sheet (image), such as occurs when two facing pages of a book are
-scanned. ``unpaper`` uses this information to deskew each independently
-and clean up the margins of both.
-
-.. code-block:: bash
-
-    ocrmypdf --clean --clean-final --unpaper-args '--layout double' input.pdf output.pdf
-    ocrmypdf --clean --clean-final --unpaper-args '--layout double --no-noisefilter' input.pdf output.pdf
-
-.. warning::
-
-   Some ``unpaper`` features will reposition text within the image.
-   ``--clean-final`` is recommended to avoid this issue.
-
-.. warning::
-
-   Some ``unpaper`` features cause multiple input or output files to be
-   consumed or produced. OCRmyPDF requires ``unpaper`` to consume one
-   file and produce one file; errors will result if this assumption is not
-   met.
-
-.. note::
-
-   ``unpaper`` uses uncompressed PBM/PGM/PPM files for its intermediate
-   files. For large images or documents, it can take a lot of temporary
-   disk space.
-
-Control of OCR options
-======================
-
-OCRmyPDF provides many features to control the behavior of the OCR
-engine, Tesseract.
-
-When OCR is skipped
--------------------
-
-If a page in a PDF seems to have text, by default OCRmyPDF will exit
-without modifying the PDF. This is to ensure that PDFs that were
-previously OCRed or were "born digital" rather than scanned are not
-processed.
-
-If ``--skip-text`` is issued, then no image processing or OCR will be
-performed on pages that already have text. The page will be copied to
-the output. This may be useful for documents that contain both "born
-digital" and scanned content, or to use OCRmyPDF to normalize and
-convert to PDF/A regardless of their contents.
-
-If ``--redo-ocr`` is issued, then a detailed text analysis is performed.
-Text is categorized as either visible or invisible. Invisible text (OCR)
-is stripped out. Then an image of each page is created with visible text
-masked out. The page image is sent for OCR, and any additional text is
-inserted as OCR. If a file contains a mix of text and bitmap images that
-contain text, OCRmyPDF will locate the additional text in images without
-disrupting the existing text. Some PDF OCR solutions render text as
-technically printable or visible in some way, perhaps by drawing it and
-then painting over it. OCRmyPDF cannot distinguish this type of OCR
-text from real text, so it will not be "redone".
-
-If ``--force-ocr`` is issued, then all pages will be rasterized to
-images, discarding any hidden OCR text, rasterizing any printable
-text, and flattening form fields or interactive objects into their visual
-representation. This is useful for redoing OCR, for fixing OCR text
-with a damaged character map (text is selectable but not searchable),
-and destroying redacted information.
-
-Time and image size limits
---------------------------
-
-By default, OCRmyPDF permits tesseract to run for three minutes (180
-seconds) per page. This is usually more than enough time to find all
-text on a reasonably sized page with modern hardware.
-
-If a page is skipped, it will be inserted without OCR. If preprocessing
-was requested, the preprocessed image layer will be inserted.
-
-If you want to adjust the amount of time spent on OCR, change
-``--tesseract-timeout``. You can also automatically skip images that
-exceed a certain number of megapixels with ``--skip-big``. (A 300 DPI,
-8.5×11" page image is 8.4 megapixels.)
-
-.. code-block:: bash
-
-    # Allow 300 seconds for OCR; skip any page larger than 50 megapixels
-    ocrmypdf --tesseract-timeout 300 --skip-big 50 bigfile.pdf output.pdf
-
-OCR for huge images
--------------------
-
-Tesseract has internal limits on the size
-of images it will process. By default,
-``--tesseract-downsample-large-images`` is enabled, and OCRmyPDF will
-downsample images to fit Tesseract limits. (The limits are usually encountered
-only for scanned images of oversized media, such as large maps or blueprints exceeding
-110 cm or 43 inches in either dimension, and at high DPI.) This feature can disabled
-using ``--no-tesseract-downsample-large-images``.
-
-``--tesseract-downsample-above Npixels`` adjusts the threshold at which images
-will be downsampled. By default, only images that exceed any of Tesseract's
-internal limits are downsampled (32767 pixels on either dimension).
-
-You will also need to set ``--tesseract-timeout`` high enough to allow
-for processing.
-
-Only the image sent for OCR is downsampled. The original image is
-preserved.
-
-.. code-block:: bash
-
-    # Allow 600 seconds for OCR on huge images
-    ocrmypdf --tesseract-timeout 600 \
-        --tesseract-downsample-large-images \
-        bigfile.pdf output.pdf
-
-    # Downsample images above 5000 pixels on the longest dimension to
-    # 5000 pixels
-    ocrmypdf --tesseract-timeout 120 \
-        --tesseract-downsample-large-images \
-        --tesseract-downsample-above 5000 \
-        bigfile.pdf output_downsampled_ocr.pdf
-
-
-Overriding default tesseract
-----------------------------
-
-OCRmyPDF checks the system ``PATH`` for the ``tesseract`` binary.
-
-Some relevant environment variables that influence Tesseract's behavior
-include:
-
-.. envvar:: TESSDATA_PREFIX
-
-   Overrides the path to Tesseract's data files. This can allow
-   simultaneous installation of the "best" and "fast" training data
-   sets. OCRmyPDF does not manage this environment variable.
-
-.. envvar:: OMP_THREAD_LIMIT
-
-   Controls the number of threads Tesseract will use. OCRmyPDF will
-   manage this environment variable if it is not already set.
-
-For example, if you have a development build of Tesseract don't wish to
-use the system installation, you can launch OCRmyPDF as follows:
-
-.. code-block:: bash
-
-    env \
-        PATH=/home/user/src/tesseract/api:$PATH \
-        TESSDATA_PREFIX=/home/user/src/tesseract \
-        ocrmypdf input.pdf output.pdf
-
-In this example ``TESSDATA_PREFIX`` is required to redirect Tesseract to
-an alternate folder for its "tessdata" files.
-
-Overriding other support programs
----------------------------------
-
-In addition to tesseract, OCRmyPDF uses the following external binaries:
-
--  ``gs`` (Ghostscript)
--  ``unpaper``
--  ``pngquant``
--  ``jbig2``
-
-In each case OCRmyPDF will search the ``PATH`` environment variable to
-locate the binaries. By modifying the ``PATH`` environment variable, you
-can override the binaries that OCRmyPDF uses.
-
-Changing Tesseract configuration variables
-------------------------------------------
-
-You can override Tesseract's default `control
-parameters <https://tesseract-ocr.github.io/tessdoc/tess3/ControlParams.html>`__
-with a configuration file.
-
-As an example, this configuration will disable Tesseract's dictionary
-for current language. Normally the dictionary is helpful for
-interpolating words that are unclear, but it may interfere with OCR if
-the document does not contain many words (for example, a list of part
-numbers).
-
-Create a file named "no-dict.cfg" with these contents:
-
-::
-
-    load_system_dawg 0
-    language_model_penalty_non_dict_word 0
-    language_model_penalty_non_freq_dict_word 0
-
-then run ocrmypdf as follows (along with any other desired arguments):
-
-.. code-block:: bash
-
-    ocrmypdf --tesseract-config no-dict.cfg input.pdf output.pdf
-
-.. warning::
-
-   Some combinations of control parameters will break Tesseract or break
-   assumptions that OCRmyPDF makes about Tesseract's output.
-
-Changing page segmentation mode
--------------------------------
-
-The directive ``--tesseract-pagesegmode Nmode`` forwards the desired page segmentation
-mode to Tesseract OCR. The default is 3.
-
-Page segmentation can improve OCR results when you know that a PDF ought to be
-analyzed a particular way, such as PDFs whose pages contain only a single line of 
-text. For the vast majority of users, changing the page segmentation mode will only
-make things worse.
-
-As of June 2024, the Tesseract page segmentation modes are:
-
-+-----+----------------------------------------------------------------------------------+
-| ID  | Description                                                                      |
-+=====+==================================================================================+
-|  0  | Orientation and script detection (OSD) only.                                      |
-+-----+----------------------------------------------------------------------------------+
-|  1  | Automatic page segmentation with OSD.                                             |
-+-----+----------------------------------------------------------------------------------+
-|  2  | Automatic page segmentation, but no OSD, or OCR. (not implemented)               |
-+-----+----------------------------------------------------------------------------------+
-|  3  | Fully automatic page segmentation, but no OSD. (Default)                         |
-+-----+----------------------------------------------------------------------------------+
-|  4  | Assume a single column of text of variable sizes.                                 |
-+-----+----------------------------------------------------------------------------------+
-|  5  | Assume a single uniform block of vertically aligned text.                         |
-+-----+----------------------------------------------------------------------------------+
-|  6  | Assume a single uniform block of text.                                            |
-+-----+----------------------------------------------------------------------------------+
-|  7  | Treat the image as a single text line.                                            |
-+-----+----------------------------------------------------------------------------------+
-|  8  | Treat the image as a single word.                                                 |
-+-----+----------------------------------------------------------------------------------+
-|  9  | Treat the image as a single word in a circle.                                     |
-+-----+----------------------------------------------------------------------------------+
-| 10  | Treat the image as a single character.                                            |
-+-----+----------------------------------------------------------------------------------+
-| 11  | Sparse text. Find as much text as possible in no particular order.                |
-+-----+----------------------------------------------------------------------------------+
-| 12  | Sparse text with OSD.                                                            |
-+-----+----------------------------------------------------------------------------------+
-| 13  | Raw line. Treat the image as a single text line, bypassing hacks that are        |
-|     | Tesseract-specific.                                                               |
-+-----+----------------------------------------------------------------------------------+
-
-Modes 0, 1, 2, and 12 (all of those that enable orientation and script detection) 
-are not compatible with OCRmyPDF, which performs OSD in a separate step from OCR.
-Their use may interfere with ``--rotate-pages`` and other features.
-
-It is currently not possible to use advanced Tesseract OCR features, such as creating
-OCR information, when using Tesseract through OCRmyPDF.
-
-Changing the PDF renderer
-=========================
-
-rasterizing
-  Converting a PDF to an image for display.
-
-rendering
-  Creating a new PDF from other data (such as an existing PDF).
-
-OCRmyPDF has these PDF renderers: ``sandwich`` and ``hocr``. The
-renderer may be selected using ``--pdf-renderer``. The default is
-``auto`` which lets OCRmyPDF select the renderer to use. Currently,
-``auto`` always selects ``hocr``.
-
-The ``hocr`` renderer
----------------------
-
-.. versionchanged:: 16.0.0
-
-In both renderers, a text-only layer is rendered and sandwiched (overlaid)
-on to either the original PDF page, or newly rasterized version of the
-original PDF page (when ``--force-ocr`` is used). In this way, loss
-of PDF information is generally avoided. (You may need to disable PDF/A
-conversion and optimization to eliminate all lossy transformations.)
-
-The current approach used by the new hOCR renderer is a re-implementation
-of Tesseract's PDF renderer, using the same Glyphless font and general
-ideas, but fixing many technical issues that impeded it. The new hocr
-provides better text placement accuracy, avoids issues with word
-segmentation, and provides better positioning of skewed text.
-
-Using the experimental API, it is also possible to edit the OCR output
-from Tesseract, using any tool that is capable of editing hOCR files.
-
-Older versions of this renderer did not support non-Latin languages, but
-it is now universal.
-
-The ``sandwich`` renderer
--------------------------
-
-The ``sandwich`` renderer uses Tesseract's text-only PDF feature,
-which produces a PDF page that lays out the OCR in invisible text.
-
-Currently some problematic PDF viewers like Mozilla PDF.js and macOS
-Preview have problems with segmenting its text output, and
-mightrunseveralwordstogether. It also does not implement right to left
-fonts (Arabic, Hebrew, Persian). The output of this renderer cannot
-be edited. The sandwich renderer is retained for testing.
-
-When image preprocessing features like ``--deskew`` are used, the
-original PDF will be rendered as a full page and the OCR layer will be
-placed on top.
-
-Rendering and rasterizing options
-=================================
-
-.. versionadded:: 14.3.0
-
-The ``--continue-on-soft-render-error`` option allows OCRmyPDF to
-proceed if a page cannot be rasterized/rendered. This is useful if you are
-trying to get the best possible OCR from a PDF that is not well-formed,
-and you are willing to accept some pages that may not visually match the
-input, and that may not OCR well.
-
-Color conversion strategy
-=========================
-
-.. versionadded:: 15.0.0
-
-OCRmyPDF uses Ghostscript to convert PDF to PDF/A. In some cases, this
-conversion requires color conversion. The default strategy is to convert
-using the ``LeaveColorUnchanged`` strategy, which preserves the original
-color space wherever possible (some rare color spaces might still be
-converted).
-
-Usually document scanners produce PDFs in the sRGB color space, and do
-not need to be converted, so the default strategy is appropriate.
-
-Suppose that you have a document that was prepared for professional
-printing in a Separation or CMYK color space, and text was converted to
-curves. In this case, you may want to use a different color conversion
-strategy. The ``--color-conversion-strategy`` option allows you to select a
-different strategy, such as ``RGB``.
-
-Return code policy
-==================
-
-OCRmyPDF writes all messages to ``stderr``. ``stdout`` is reserved for
-piping output files. ``stdin`` is reserved for piping input files.
-
-The return codes generated by the OCRmyPDF are considered part of the
-stable user interface. They may be imported from
-``ocrmypdf.exceptions``.
-
-.. list-table:: Return codes
-    :widths: 5 35 60
-    :header-rows: 1
-
-    *	- Code
-        - Name
-        - Interpretation
-    *	- 0
-        - ``ExitCode.ok``
-        - Everything worked as expected.
-    *	- 1
-        - ``ExitCode.bad_args``
-        - Invalid arguments, exited with an error.
-    *	- 2
-        - ``ExitCode.input_file``
-        - The input file does not seem to be a valid PDF.
-    *	- 3
-        - ``ExitCode.missing_dependency``
-        - An external program required by OCRmyPDF is missing.
-    *	- 4
-        - ``ExitCode.invalid_output_pdf``
-        - An output file was created, but it does not seem to be a valid PDF. The file will be available.
-    *	- 5
-        - ``ExitCode.file_access_error``
-        - The user running OCRmyPDF does not have sufficient permissions to read the input file and write the output file.
-    *	- 6
-        - ``ExitCode.already_done_ocr``
-        - The file already appears to contain text so it may not need OCR. See output message.
-    *	- 7
-        - ``ExitCode.child_process_error``
-        - An error occurred in an external program (child process) and OCRmyPDF cannot continue.
-    *	- 8
-        - ``ExitCode.encrypted_pdf``
-        - The input PDF is encrypted. OCRmyPDF does not read encrypted PDFs. Use another program such as ``qpdf`` to remove encryption.
-    *	- 9
-        - ``ExitCode.invalid_config``
-        - A custom configuration file was forwarded to Tesseract using ``--tesseract-config``, and Tesseract rejected this file.
-    *   - 10
-        - ``ExitCode.pdfa_conversion_failed``
-        - A valid PDF was created, PDF/A conversion failed. The file will be available.
-    *	- 15
-        - ``ExitCode.other_error``
-        - Some other error occurred.
-    *	- 130
-        - ``ExitCode.ctrl_c``
-        - The program was interrupted by pressing Ctrl+C.
-
-
-.. _tmpdir:
-
-Changing temporary storage location
-===================================
-
-OCRmyPDF generates many temporary files during processing.
-
-To change where temporary files are stored, change the ``TMPDIR``
-environment variable for ocrmypdf's environment. (Python's
-``tempfile.gettempdir()`` returns the root directory in which temporary
-files will be stored.) For example, one could redirect ``TMPDIR`` to a
-large RAM disk to avoid wear on HDD/SSD and potentially improve
-performance.
-
-On Windows, the ``TEMP`` environment variable is used instead.
-
-Debugging the intermediate files
-================================
-
-OCRmyPDF normally saves its intermediate results to a temporary folder
-and deletes this folder when it exits, whether it succeeded or failed.
-
-If the ``--keep-temporary-files`` (``-k```) argument is issued on the
-command line, OCRmyPDF will keep the temporary folder and print the location,
-whether it succeeded or failed. An example message is:
-
-.. code-block:: none
-
-    Temporary working files retained at:
-    /tmp/ocrmypdf.io.u20wpz07
-
-The organization of this folder is an implementation detail and subject
-to change between releases. However the general organization is that
-working files on a per page basis have the page number as a prefix
-(starting with page 1), an infix indicates the processing stage, and a
-suffix indicates the file type. Some important files include:
-
--  ``_rasterize.png`` - what the input page looks like
--  ``_ocr.png`` - the file that is sent to Tesseract for OCR; depending
-   on arguments this may differ from the presentation image
--  ``_pp_deskew.png`` - the image, after deskewing
--  ``_pp_clean.png`` - the image, after cleaning with unpaper
--  ``_ocr_tess.pdf`` - the OCR file; appears as a blank page with invisible
-   text embedded
--  ``_ocr_tess.txt`` - the OCR text (not necessarily all text on the page,
-   if the page is mixed format)
--  ``fix_docinfo.pdf`` - a temporary file created to fix the PDF DocumentInfo
-   data structure
--  ``graft_layers.pdf`` - the rendered PDF with OCR layers grafted on
--  ``pdfa.pdf`` - ``graft_layers.pdf`` after conversion to PDF/A
--  ``pdfa.ps`` - a PostScript file used by Ghostscript for PDF/A conversion
--  ``optimize.pdf`` - the PDF generated before optimization
--  ``optimize.out.pdf`` - the PDF generated by optimization
--  ``origin`` - the input file
--  ``origin.pdf`` - the input file or the input image converted to PDF
--  ``images/*`` - images extracted during the optimization process; here
-   the prefix indicates a PDF object ID not a page number

docs/api.md

@@ -1,10 +1,7 @@
-.. SPDX-FileCopyrightText: 2022 James R. Barlow
-..
-.. SPDX-License-Identifier: CC-BY-SA-4.0
+% SPDX-FileCopyrightText: 2022 James R. Barlow
+% SPDX-License-Identifier: CC-BY-SA-4.0
 
-======================
-Using the OCRmyPDF API
-======================
+# Using the OCRmyPDF API
 
 OCRmyPDF originated as a command line program and continues to have this
 legacy, but parts of it can be imported and used in other Python
@@ -13,100 +10,95 @@ applications.
 Some applications may want to consider running ocrmypdf from a
 subprocess call anyway, as this provides isolation of its activities.
 
-Example
-=======
+## Example
 
 OCRmyPDF provides one high-level function to run its main engine from an
 application. The parameters are symmetric to the command line arguments
 and largely have the same functions.
 
-.. code-block:: python
+```python
+import ocrmypdf
 
-    import ocrmypdf
-
-    if __name__ == '__main__':  # To ensure correct behavior on Windows and macOS
-        ocrmypdf.ocr('input.pdf', 'output.pdf', deskew=True)
+if __name__ == '__main__':  # To ensure correct behavior on Windows and macOS
+    ocrmypdf.ocr('input.pdf', 'output.pdf', deskew=True)
+```
 
 With some exceptions, all of the command line arguments are available
 and may be passed as equivalent keywords.
 
-A few differences are that ``verbose`` and ``quiet`` are not available.
+A few differences are that `verbose` and `quiet` are not available.
 Instead, output should be managed by configuring logging.
 
-Parent process requirements
----------------------------
+### Parent process requirements
 
-The :func:`ocrmypdf.ocr` function runs OCRmyPDF similar to command line
+The {func}`ocrmypdf.ocr` function runs OCRmyPDF similar to command line
 execution. To do this, it will:
 
 - create worker processes or threads
 - manage the signal flags of its worker processes
 - execute other subprocesses (forking and executing other programs)
 
-The Python process that calls :func:`ocrmypdf.ocr()` must be sufficiently
+The Python process that calls {func}`ocrmypdf.ocr()` must be sufficiently
 privileged to perform these actions.
 
 There currently is no option to manage how jobs are scheduled other
-than the argument ``jobs=`` which will limit the number of worker
+than the argument `jobs=` which will limit the number of worker
 processes.
 
-Creating a child process to call :func:`ocrmypdf.ocr()` is suggested. That
+Creating a child process to call {func}`ocrmypdf.ocr()` is suggested. That
 way your application will survive and remain interactive even if
 OCRmyPDF fails for any reason. For example:
 
-.. code-block:: python
+```python
+from multiprocessing import Process
 
-    from multiprocessing import Process
+def ocrmypdf_process():
+    ocrmypdf.ocr('input.pdf', 'output.pdf')
 
-    def ocrmypdf_process():
-        ocrmypdf.ocr('input.pdf', 'output.pdf')
+def call_ocrmypdf_from_my_app():
+    p = Process(target=ocrmypdf_process)
+    p.start()
+    p.join()
+```
 
-    def call_ocrmypdf_from_my_app():
-        p = Process(target=ocrmypdf_process)
-        p.start()
-        p.join()
-
-Programs that call :func:`ocrmypdf.ocr()` should also install a SIGBUS signal
+Programs that call {func}`ocrmypdf.ocr()` should also install a SIGBUS signal
 handler (except on Windows), to raise an exception if access to a memory
 mapped file fails. OCRmyPDF may use memory mapping.
 
-:func:`ocrmypdf.ocr()` will take a threading lock to prevent multiple runs of itself
+{func}`ocrmypdf.ocr()` will take a threading lock to prevent multiple runs of itself
 in the same Python interpreter process. This is not thread-safe, because of how
 OCRmyPDF's plugins and Python's library import system work. If you need to parallelize
 OCRmyPDF, use processes.
 
-.. warning::
+:::{warning}
+On Windows and macOS, the script that calls {func}`ocrmypdf.ocr()` must be
+protected by an "ifmain" guard (`if __name__ == '__main__'`). If you do
+not take at least one of these steps, process semantics will prevent
+OCRmyPDF from working correctly.
+:::
 
-    On Windows and macOS, the script that calls :func:`ocrmypdf.ocr()` must be
-    protected by an "ifmain" guard (``if __name__ == '__main__'``). If you do
-    not take at least one of these steps, process semantics will prevent
-    OCRmyPDF from working correctly.
+### Logging
 
-Logging
--------
-
-OCRmyPDF will log under loggers named ``ocrmypdf``. In addition, it
-imports ``pdfminer`` and ``PIL``, both of which post log messages under
+OCRmyPDF will log under loggers named `ocrmypdf`. In addition, it
+imports `pdfminer` and `PIL`, both of which post log messages under
 those logging namespaces.
 
 You can configure the logging as desired for your application or call
-:func:`ocrmypdf.configure_logging` to configure logging the same way
-OCRmyPDF itself does. The command line parameters such as ``--quiet``
-and ``--verbose`` have no equivalents in the API; you must use the
+{func}`ocrmypdf.configure_logging` to configure logging the same way
+OCRmyPDF itself does. The command line parameters such as `--quiet`
+and `--verbose` have no equivalents in the API; you must use the
 provided configuration function or do configuration in a way that suits
 your use case.
 
-Progress monitoring
--------------------
+### Progress monitoring
 
-OCRmyPDF uses the ``rich`` package to implement its progress bars.
-:func:`ocrmypdf.configure_logging` will set up logging output to
-``sys.stderr`` in a way that is compatible with the display of the
-progress bar. Use ``ocrmypdf.ocr(...progress_bar=False)`` to disable
+OCRmyPDF uses the `rich` package to implement its progress bars.
+{func}`ocrmypdf.configure_logging` will set up logging output to
+`sys.stderr` in a way that is compatible with the display of the
+progress bar. Use `ocrmypdf.ocr(...progress_bar=False)` to disable
 the progress bar.
 
-Standard output
----------------
+### Standard output
 
 OCRmyPDF is strict about not writing to standard output so that
 users can safely use it in a pipeline and produce a valid output
@@ -116,12 +108,11 @@ behavior and support piping to a file. Another benefit of running
 OCRmyPDF in a child process, as recommended above, is that it will
 not interfere with the parent process's standard output.
 
-Exceptions
-----------
+### Exceptions
 
-OCRmyPDF may throw standard Python exceptions, ``ocrmypdf.exceptions.*``
+OCRmyPDF may throw standard Python exceptions, `ocrmypdf.exceptions.*`
 exceptions, some exceptions related to multiprocessing, and
-:exc:`KeyboardInterrupt`. The parent process should provide an exception
+{exc}`KeyboardInterrupt`. The parent process should provide an exception
 handler. OCRmyPDF will clean up its temporary files and worker processes
 automatically when an exception occurs.
 

docs/apiref.md

@@ -0,0 +1,60 @@
+% SPDX-FileCopyrightText: 2022 James R. Barlow
+% SPDX-License-Identifier: CC-BY-SA-4.0
+
+# API reference
+
+This page summarizes the rest of the public API. Generally speaking this
+should be mainly of interest to plugin developers.
+
+## ocrmypdf.api
+
+```{eval-rst}
+.. automodule:: ocrmypdf.api
+    :members:
+```
+
+## ocrmypdf.exceptions
+
+```{eval-rst}
+.. automodule:: ocrmypdf.exceptions
+    :members:
+    :undoc-members:
+```
+
+## ocrmypdf.helpers
+
+```{eval-rst}
+.. automodule:: ocrmypdf.helpers
+    :members:
+    :noindex: deprecated
+
+    .. autodecorator:: deprecated
+```
+
+## ocrmypdf.hocrtransform
+
+```{eval-rst}
+.. automodule:: ocrmypdf.hocrtransform
+    :members:
+```
+
+## ocrmypdf.pdfa
+
+```{eval-rst}
+.. automodule:: ocrmypdf.pdfa
+    :members:
+```
+
+## ocrmypdf.quality
+
+```{eval-rst}
+.. automodule:: ocrmypdf.quality
+    :members:
+```
+
+## ocrmypdf.subprocess
+
+```{eval-rst}
+.. automodule:: ocrmypdf.subprocess
+    :members:
+```

docs/apiref.rst

@@ -1,71 +0,0 @@
-.. SPDX-FileCopyrightText: 2022 James R. Barlow
-..
-.. SPDX-License-Identifier: CC-BY-SA-4.0
-
-=============
-API reference
-=============
-
-This page summarizes the rest of the public API. Generally speaking this
-should be mainly of interest to plugin developers.
-
-ocrmypdf
-========
-
-.. autoclass:: ocrmypdf.PageContext
-    :members:
-
-.. autoclass:: ocrmypdf.PdfContext
-    :members:
-
-.. autoclass:: ocrmypdf.Verbosity
-    :members:
-    :undoc-members:
-
-.. autofunction:: ocrmypdf.configure_logging
-
-.. autofunction:: ocrmypdf.ocr
-
-.. autofunction:: ocrmypdf.pdf_to_hocr
-
-.. autofunction:: ocrmypdf.hocr_to_ocr_pdf
-
-ocrmypdf.exceptions
-===================
-
-.. automodule:: ocrmypdf.exceptions
-    :members:
-    :undoc-members:
-
-ocrmypdf.helpers
-================
-
-.. automodule:: ocrmypdf.helpers
-    :members:
-    :noindex: deprecated
-
-    .. autodecorator:: deprecated
-
-ocrmypdf.hocrtransform
-======================
-
-.. automodule:: ocrmypdf.hocrtransform
-    :members:
-
-ocrmypdf.pdfa
-=============
-
-.. automodule:: ocrmypdf.pdfa
-    :members:
-
-ocrmypdf.quality
-================
-
-.. automodule:: ocrmypdf.quality
-    :members:
-
-ocrmypdf.subprocess
-===================
-
-.. automodule:: ocrmypdf.subprocess
-    :members:

docs/batch.md

@@ -0,0 +1,248 @@
+% SPDX-FileCopyrightText: 2022 James R. Barlow
+% SPDX-License-Identifier: CC-BY-SA-4.0
+
+Batch processing
+================
+
+This article provides information about running OCRmyPDF on multiple
+files or configuring it as a service triggered by file system events.
+
+Batch jobs
+----------
+
+Consider using the excellent [GNU
+Parallel](https://www.gnu.org/software/parallel/) to apply OCRmyPDF to
+multiple files at once.
+
+Both `parallel` and `ocrmypdf` will try to use all available processors.
+To maximize parallelism without overloading your system with processes,
+consider using `parallel -j 2` to limit parallel to running two jobs at
+once.
+
+This command will run `ocrmypdf` on all files named `*.pdf` in the
+current directory and write them to the previously created `output/`
+folder. It will not search subdirectories.
+
+The `--tag` argument tells parallel to print the filename as a prefix
+whenever a message is printed, so that one can trace any errors to the
+file that produced them.
+
+:::{code} bash
+parallel --tag -j 2 ocrmypdf '{}' 'output/{}' ::: *.pdf
+:::
+
+OCRmyPDF automatically repairs PDFs before parsing and gathering
+information from them.
+
+Directory trees
+---------------
+
+This will walk through a directory tree and run OCR on all files in
+place, and printing each filename in between runs:
+
+:::{code} bash
+find . -name '*.pdf' -printf '%p\n' -exec ocrmypdf '{}' '{}' \;
+:::
+
+This only runs one `ocrmypdf` process at a time. This variation uses
+`find` to create a directory list and `parallel` to parallelize runs of
+`ocrmypdf`, again updating files in place.
+
+:::{code} bash
+find . -name '*.pdf' | parallel --tag -j 2 ocrmypdf '{}' '{}'
+:::
+
+In a Windows batch file, use
+
+:::{code} bat
+for /r %%f in (*.pdf) do ocrmypdf %%f %%f
+:::
+
+With a Docker container, you will need to stream through standard input
+and output:
+
+:::{code} bash
+find . -name '*.pdf' -print0 | xargs -0 | while read pdf; do
+    pdfout=$(mktemp)
+    docker run --rm -i jbarlow83/ocrmypdf - - <$pdf >$pdfout && cp $pdfout $pdf
+done
+:::
+
+### Sample script
+
+This user contributed script also provides an example of batch
+processing.
+
+:::{literalinclude} ../misc/batch.py
+---
+caption: misc/batch.py
+---
+:::
+
+### Synology DiskStations
+
+Synology DiskStations (Network Attached Storage devices) can run the
+Docker image of OCRmyPDF if the Synology [Docker
+package](https://www.synology.com/en-global/dsm/packages/Docker) is
+installed. Attached is a script to address particular quirks of using
+OCRmyPDF on one of these devices.
+
+At the time this script was written, it only worked for x86-based
+Synology products. It is not known if it will work on ARM-based Synology
+products. Further adjustments might be needed to deal with the
+Synology\'s relatively limited CPU and RAM.
+
+:::{literalinclude} ../misc/synology.py
+---
+caption: misc/synology.py - Sample script for Synology DiskStations
+---
+:::
+
+### Huge batch jobs
+
+If you have thousands of files to work with, contact the author.
+Consulting work related to OCRmyPDF helps fund this open source project
+and all inquiries are appreciated.
+
+Hot (watched) folders
+---------------------
+
+### Watched folders with watcher.py
+
+OCRmyPDF has a folder watcher called watcher.py, which is currently
+included in source distributions but not part of the main program. It
+may be used natively or may run in a Docker container. Native instances
+tend to give better performance. watcher.py works on all platforms.
+
+Users may need to customize the script to meet their requirements.
+
+:::{code} bash
+pip3 install ocrmypdf[watcher]
+
+env OCR_INPUT_DIRECTORY=/mnt/input-pdfs \
+    OCR_OUTPUT_DIRECTORY=/mnt/output-pdfs \
+    OCR_OUTPUT_DIRECTORY_YEAR_MONTH=1 \
+    python3 watcher.py
+:::
+
+:::{list-table} watcher.py environment variables
+---
+header-rows: 1
+---
+
+* - Environment variable
+  - Description
+* - OCR\_INPUT\_DIRECTORY
+  - Set input directory to monitor (recursive)
+* - OCR\_OUTPUT\_DIRECTORY
+  - Set output directory (should not be under input)
+* - OCR\_ARCHIVE\_DIRECTORY
+  - Set archive directory for processed originals (should not be under input, requires `OCR_ON_SUCCESS_ARCHIVE` to be set)
+* - OCR\_ON\_SUCCESS\_DELETE
+  - This will move the processed original file to `OCR_ARCHIVE_DIRECTORY` if the exit code is 0 (OK). Note that `OCR_ON_SUCCESS_DELETE` takes precedence over this option, i.e. if both options are set, the input file will be deleted.
+* - OCR\_OUTPUT\_DIRECTORY\_YEAR\_MONTH
+  - This will place files in the output in `{output}/{year}/{month}/{filename}`
+* - OCR\_DESKEW
+  - Apply deskew to crooked input PDFs
+* - OCR\_JSON\_SETTINGS
+  - A JSON string specifying any other arguments for `ocrmypdf.ocr`, e.g. `'OCR_JSON_SETTINGS={"rotate_pages": true, "optimize": "3"}'`.
+* - OCR\_POLL\_NEW\_FILE\_SECONDS
+  - Polling interval
+* - OCR\_LOGLEVEL
+  - Level of log messages t
+:::
+
+One could configure a networked scanner or scanning computer to drop
+files in the watched folder.
+
+### Watched folders with Docker
+
+The watcher service is included in the OCRmyPDF Docker image. To run it:
+
+:::{code} bash
+docker run \
+    --volume <path to files to convert>:/input \
+    --volume <path to store results>:/output \
+    --volume <path to store processed originals>:/processed \
+    --env OCR_OUTPUT_DIRECTORY_YEAR_MONTH=1 \
+    --env OCR_ON_SUCCESS_ARCHIVE=1 \
+    --env OCR_DESKEW=1 \
+    --env PYTHONUNBUFFERED=1 \
+    --interactive --tty --entrypoint python3 \
+    jbarlow83/ocrmypdf \
+    watcher.py
+:::
+
+This service will watch for a file that matches `/input/\*.pdf`, convert
+it to a OCRed PDF in `/output/`, and move the processed original to
+`/processed`. The parameters to this image are:
+
+:::{list-table} Watcher Docker Parameters
+:header-rows: 1
+
+* - Parameter
+  - Description
+* - `--volume <path to files to convert>:/input`
+  - Files placed in this location will be OCRed
+* - `--volume <path to store results>:/output`
+  - This is where OCRed files will be stored
+* - `--volume <path to store processed originals>:/processed`
+  - Archive processed originals here
+* - `--env OCR_OUTPUT_DIRECTORY_YEAR_MONTH=1`
+  - Define environment variable `OCR_OUTPUT_DIRECTORY_YEAR_MONTH=1` to place files in the output in `{output}/{year}/{month}/{filename}`
+* - `--env OCR_ON_SUCCESS_ARCHIVE=1`
+  - Define environment variable `OCR_ON_SUCCESS_ARCHIVE` to move processed originals
+* - `--env OCR_DESKEW=1`
+  - Define environment variable `OCR_DESKEW` to apply deskew to crooked input PDFs
+* - `--env PYTHONBUFFERED=1`
+  - This will force `STDOUT` to be unbuffered and allow you to see messages in docker logs
+:::
+
+This service relies on polling to check for changes to the filesystem.
+It may not be suitable for some environments, such as filesystems shared
+on a slow network.
+
+A configuration manager such as Docker Compose could be used to ensure
+that the service is always available.
+
+:::{literalinclude} ../misc/docker-compose.example.yml
+---
+caption: misc/docker-compose.example.yml
+---
+:::
+
+### Caveats
+
+-   `watchmedo` may not work properly on a networked file system,
+    depending on the capabilities of the file system client and server.
+-   This simple recipe does not filter for the type of file system
+    event, so file copies, deletes and moves, and directory operations,
+    will all be sent to ocrmypdf, producing errors in several cases.
+    Disable your watched folder if you are doing anything other than
+    copying files to it.
+-   If the source and destination directory are the same, watchmedo may
+    create an infinite loop.
+-   On BSD, FreeBSD and older versions of macOS, you may need to
+    increase the number of file descriptors to monitor more files, using
+    `ulimit -n 1024` to watch a folder of up to 1024 files.
+
+### Alternatives
+
+-   On Linux, [systemd user
+    services](https://wiki.archlinux.org/index.php/Systemd/User) can be
+    configured to automatically perform OCR on a collection of files.
+-   [Watchman](https://facebook.github.io/watchman/) is a more powerful
+    alternative to `watchmedo`.
+
+macOS Automator
+---------------
+
+You can use the Automator app with macOS, to create a Workflow or Quick
+Action. Use a *Run Shell Script* action in your workflow. In the context
+of Automator, the `PATH` may be set differently your Terminal\'s `PATH`;
+you may need to explicitly set the PATH to include `ocrmypdf`. The
+following example may serve as a starting point:
+
+![](images/macos-workflow.png)
+
+You may customize the command sent to ocrmypdf.

docs/batch.rst

@@ -1,228 +0,0 @@
-.. SPDX-FileCopyrightText: 2022 James R. Barlow
-..
-.. SPDX-License-Identifier: CC-BY-SA-4.0
-
-================
-Batch processing
-================
-
-This article provides information about running OCRmyPDF on multiple
-files or configuring it as a service triggered by file system events.
-
-Batch jobs
-==========
-
-Consider using the excellent `GNU
-Parallel <https://www.gnu.org/software/parallel/>`__ to apply OCRmyPDF
-to multiple files at once.
-
-Both ``parallel`` and ``ocrmypdf`` will try to use all available
-processors. To maximize parallelism without overloading your system with
-processes, consider using ``parallel -j 2`` to limit parallel to running
-two jobs at once.
-
-This command will run ``ocrmypdf`` on all files named ``*.pdf`` in the
-current directory and write them to the previously created ``output/``
-folder. It will not search subdirectories.
-
-The ``--tag`` argument tells parallel to print the filename as a prefix
-whenever a message is printed, so that one can trace any errors to the
-file that produced them.
-
-.. code-block:: bash
-
-   parallel --tag -j 2 ocrmypdf '{}' 'output/{}' ::: *.pdf
-
-OCRmyPDF automatically repairs PDFs before parsing and gathering
-information from them.
-
-Directory trees
-===============
-
-This will walk through a directory tree and run OCR on all files in
-place, and printing each filename in between runs:
-
-.. code-block:: bash
-
-   find . -printf '%p\n' -name '*.pdf' -exec ocrmypdf '{}' '{}' \;
-
-This only runs one ``ocrmypdf`` process at a time. This variation uses
-``find`` to create a directory list and ``parallel`` to parallelize runs
-of ``ocrmypdf``, again updating files in place.
-
-.. code-block:: bash
-
-   find . -name '*.pdf' | parallel --tag -j 2 ocrmypdf '{}' '{}'
-
-In a Windows batch file, use
-
-.. code-block:: bat
-
-   for /r %%f in (*.pdf) do ocrmypdf %%f %%f
-
-With a Docker container, you will need to stream through standard input and output:
-
-.. code-block:: bash
-
-   find . -name '*.pdf' -print0 | xargs -0 | while read pdf; do
-       pdfout=$(mktemp)
-       docker run --rm -i jbarlow83/ocrmypdf - - <$pdf >$pdfout && cp $pdfout $pdf
-   done
-
-Sample script
--------------
-
-This user contributed script also provides an example of batch
-processing.
-
-.. literalinclude:: ../misc/batch.py
-    :caption: misc/batch.py
-
-Synology DiskStations
----------------------
-
-Synology DiskStations (Network Attached Storage devices) can run the
-Docker image of OCRmyPDF if the Synology `Docker
-package <https://www.synology.com/en-global/dsm/packages/Docker>`__ is
-installed. Attached is a script to address particular quirks of using
-OCRmyPDF on one of these devices.
-
-At the time this script was written, it only worked for x86-based Synology
-products. It is not known if it will work on ARM-based Synology products.
-Further adjustments might be needed to deal with the Synology's relatively
-limited CPU and RAM.
-
-.. literalinclude:: ../misc/synology.py
-    :caption: misc/synology.py - Sample script for Synology DiskStations
-
-Huge batch jobs
----------------
-
-If you have thousands of files to work with, contact the author.
-Consulting work related to OCRmyPDF helps fund this open source project
-and all inquiries are appreciated.
-
-Hot (watched) folders
-=====================
-
-Watched folders with watcher.py
--------------------------------
-
-OCRmyPDF has a folder watcher called watcher.py, which is currently included in source
-distributions but not part of the main program. It may be used natively or may run
-in a Docker container. Native instances tend to give better performance. watcher.py
-works on all platforms.
-
-Users may need to customize the script to meet their requirements.
-
-.. code-block:: bash
-
-    pip3 install ocrmypdf[watcher]
-
-    env OCR_INPUT_DIRECTORY=/mnt/input-pdfs \
-        OCR_OUTPUT_DIRECTORY=/mnt/output-pdfs \
-        OCR_OUTPUT_DIRECTORY_YEAR_MONTH=1 \
-        python3 watcher.py
-
-.. csv-table:: watcher.py environment variables
-    :header: "Environment variable", "Description"
-    :widths: 50, 50
-
-    "OCR_INPUT_DIRECTORY", "Set input directory to monitor (recursive)"
-    "OCR_OUTPUT_DIRECTORY", "Set output directory (should not be under input)"
-    "OCR_ARCHIVE_DIRECTORY", "Set archive directory for processed originals (should not be under input, requires ``OCR_ON_SUCCESS_ARCHIVE`` to be set)"
-    "OCR_ON_SUCCESS_DELETE", "This will delete the input file if the exit code is 0 (OK)"
-    "OCR_ON_SUCCESS_ARCHIVE", "This will move the processed original file to ``OCR_ARCHIVE_DIRECTORY`` if the exit code is 0 (OK). Note that ``OCR_ON_SUCCESS_DELETE`` takes precedence over this option, i.e. if both options are set, the input file will be deleted."
-    "OCR_OUTPUT_DIRECTORY_YEAR_MONTH", "This will place files in the output in ``{output}/{year}/{month}/{filename}``"
-    "OCR_DESKEW", "Apply deskew to crooked input PDFs"
-    "OCR_JSON_SETTINGS", "A JSON string specifying any other arguments for ``ocrmypdf.ocr``, e.g. ``'OCR_JSON_SETTINGS={""rotate_pages"": true, ""optimize"": "3"}'``."
-    "OCR_POLL_NEW_FILE_SECONDS", "Polling interval"
-    "OCR_LOGLEVEL", "Level of log messages to report"
-
-One could configure a networked scanner or scanning computer to drop files in the
-watched folder.
-
-Watched folders with Docker
----------------------------
-
-The watcher service is included in the OCRmyPDF Docker image. To run it:
-
-.. code-block:: bash
-
-    docker run \
-        --volume <path to files to convert>:/input \
-        --volume <path to store results>:/output \
-        --volume <path to store processed originals>:/processed \
-        --env OCR_OUTPUT_DIRECTORY_YEAR_MONTH=1 \
-        --env OCR_ON_SUCCESS_ARCHIVE=1 \
-        --env OCR_DESKEW=1 \
-        --env PYTHONUNBUFFERED=1 \
-        --interactive --tty --entrypoint python3 \
-        jbarlow83/ocrmypdf \
-        watcher.py
-
-This service will watch for a file that matches ``/input/\*.pdf``,
-convert it to a OCRed PDF in ``/output/``, and move the processed
-original to ``/processed``. The parameters to this image are:
-
-.. csv-table:: watcher.py parameters for Docker
-    :header: "Parameter", "Description"
-    :widths: 50, 50
-
-    "``--volume <path to files to convert>:/input``", "Files placed in this location will be OCRed"
-    "``--volume <path to store results>:/output``", "This is where OCRed files will be stored"
-    "``--volume <path to store processed originals>:/processed``", "Archive processed originals here"
-    "``--env OCR_OUTPUT_DIRECTORY_YEAR_MONTH=1``", "Define environment variable ``OCR_OUTPUT_DIRECTORY_YEAR_MONTH=1`` to place files in the output in ``{output}/{year}/{month}/{filename}``"
-    "``--env OCR_ON_SUCCESS_ARCHIVE=1``", "Define environment variable ``OCR_ON_SUCCESS_ARCHIVE`` to move processed originals"
-    "``--env OCR_DESKEW=1``", "Define environment variable ``OCR_DESKEW``  to apply deskew to crooked input PDFs"
-    "``--env PYTHONBUFFERED=1``", "This will force ``STDOUT`` to be unbuffered and allow you to see messages in docker logs"
-
-This service relies on polling to check for changes to the filesystem. It
-may not be suitable for some environments, such as filesystems shared on a
-slow network.
-
-A configuration manager such as Docker Compose could be used to ensure that the
-service is always available.
-
-.. literalinclude:: ../misc/docker-compose.example.yml
-    :language: yaml
-    :caption: misc/docker-compose.example.yml
-
-Caveats
--------
-
--  ``watchmedo`` may not work properly on a networked file system,
-   depending on the capabilities of the file system client and server.
--  This simple recipe does not filter for the type of file system event,
-   so file copies, deletes and moves, and directory operations, will all
-   be sent to ocrmypdf, producing errors in several cases. Disable your
-   watched folder if you are doing anything other than copying files to
-   it.
--  If the source and destination directory are the same, watchmedo may
-   create an infinite loop.
--  On BSD, FreeBSD and older versions of macOS, you may need to increase
-   the number of file descriptors to monitor more files, using
-   ``ulimit -n 1024`` to watch a folder of up to 1024 files.
-
-Alternatives
-------------
-
--  On Linux, `systemd user services <https://wiki.archlinux.org/index.php/Systemd/User>`__
-   can be configured to automatically perform OCR on a collection of files.
-
--  `Watchman <https://facebook.github.io/watchman/>`__ is a more
-   powerful alternative to ``watchmedo``.
-
-macOS Automator
-===============
-
-You can use the Automator app with macOS, to create a Workflow or Quick
-Action. Use a *Run Shell Script* action in your workflow. In the context
-of Automator, the ``PATH`` may be set differently your Terminal's
-``PATH``; you may need to explicitly set the PATH to include
-``ocrmypdf``. The following example may serve as a starting point:
-
-.. figure:: images/macos-workflow.png
-    :alt: Example macOS Automator workflow
-
-You may customize the command sent to ocrmypdf.

docs/cloud.md

@@ -0,0 +1,84 @@
+% SPDX-FileCopyrightText: 2025 James R. Barlow
+% SPDX-License-Identifier: CC-BY-SA-4.0
+
+(ocr-service)=
+
+# Online deployments
+
+OCRmyPDF is designed to be used as a command line tool, but it can be
+used in a web service. This document describes some considerations for
+doing so.
+
+A basic web service implementation is provided in the source code
+repository, as `misc/webservice.py`. It is only demonstration quality
+and is not intended for production use.
+
+OCRmyPDF is not designed for use as a public web service where a
+malicious user could upload a chosen PDF. In particular, it is not
+necessarily secure against PDF malware or PDFs that cause denial of
+service. For further discussino of security, see
+[security](security).
+
+OCRmyPDF relies on Ghostscript, and therefore, if deployed online one
+should be prepared to comply with Ghostscript\'s Affero GPL license, and
+any other licenses.
+
+Setting aside these concerns, a side effect of OCRmyPDF is that it may
+incidentally sanitize PDFs containing certain types of malware. It
+repairs the PDF with pikepdf/libqpdf, which could correct malformed PDF
+structures that are part of an attack. When PDF/A output is selected
+(the default), the input PDF is partially reconstructed by Ghostscript.
+When `--force-ocr` is used, all pages are rasterized and reconverted to
+PDF, which could remove malware in embedded images.
+
+## Limiting CPU usage
+
+OCRmyPDF will attempt to use all available CPUs and storage, so
+executing `nice ocrmypdf` or limiting the number of jobs with the
+`--jobs` argument may ensure the server remains responsive. Another
+option would be to run OCRmyPDF jobs inside a Docker container, a
+virtual machine, or a cloud instance, which can impose its own limits on
+CPU usage and be terminated \"from orbit\" if it fails to complete.
+
+## Temporary storage requirements
+
+OCRmyPDF will use a large amount of temporary storage for its work,
+proportional to the total number of pixels needed to rasterize the PDF.
+The raster image of a 8.5×11\" color page at 300 DPI takes 25 MB
+uncompressed; OCRmyPDF saves its intermediates as PNG, but that still
+means it requires about 9 MB per intermediate based on average
+compression ratios. Multiple intermediates per page are also required,
+depending on the command line given. A rule of thumb would be to allow
+100 MB of temporary storage per page in a file -- meaning that a small
+cloud servers or small VM partitions should be provisioned with plenty
+of extra space, if say, a 500 page file might be sent.
+
+To change the temporary directory, see [tmpdir](#tmpdir).
+
+On Amazon Web Services or other cloud vendors, consider setting your
+temporary directory to [empheral
+storage](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/InstanceStorage.html).
+
+## Timeouts
+
+To prevent excessively long OCR jobs consider setting
+`--tesseract-timeout` and/or `--skip-big` arguments. `--skip-big` is
+particularly helpful if your PDFs include documents such as reports on
+standard page sizes with large images attached - often large images are
+not worth OCR\'ing anyway.
+
+## Document management systems
+
+If you are looking for a full document management system, consider
+[paperless-ngx](https://github.com/paperless-ngx/paperless-ngx), which
+is a web application that uses OCRmyPDF to automatically OCR and archive
+documents.
+
+## Commercial OCR alternatives
+
+The author also provides professional services that include OCR and
+building databases around PDFs, and is happy to provide consultation.
+
+Abbyy Cloud OCR is viable commercial alternative with a web services
+API. Amazon Textract, Google Cloud Vision, and Microsoft Azure Computer
+Vision provide advanced OCR but have less PDF rendering capability.

docs/cloud.rst

@@ -1,92 +0,0 @@
-.. SPDX-FileCopyrightText: 2023 James R. Barlow
-..
-.. SPDX-License-Identifier: CC-BY-SA-4.0
-
-
-.. _ocr-service:
-
-==================
-Online deployments
-==================
-
-OCRmyPDF is designed to be used as a command line tool, but it can be
-used in a web service. This document describes some considerations for
-doing so.
-
-A basic web service implementation is provided in the source code
-repository, as ``misc/webservice.py``. It is only demonstration quality
-and is not intended for production use.
-
-OCRmyPDF is not designed for use as a public web service where a
-malicious user could upload a chosen PDF. In particular, it is not
-necessarily secure against PDF malware or PDFs that cause denial of
-service. For further discussino of security, see :ref:`security`.
-
-OCRmyPDF relies on Ghostscript, and therefore, if deployed
-online one should be prepared to comply with Ghostscript's Affero GPL
-license, and any other licenses.
-
-Setting aside these concerns, a side effect of OCRmyPDF is that it may
-incidentally sanitize PDFs containing certain types of malware. It
-repairs the PDF with pikepdf/libqpdf, which could correct malformed PDF
-structures that are part of an attack. When PDF/A output is selected
-(the default), the input PDF is partially reconstructed by Ghostscript.
-When ``--force-ocr`` is used, all pages are rasterized and reconverted
-to PDF, which could remove malware in embedded images.
-
-Limiting CPU usage
-------------------
-
-OCRmyPDF will attempt to use all available CPUs and storage, so
-executing ``nice ocrmypdf`` or limiting the number of jobs with the
-``--jobs`` argument may ensure the server remains responsive. Another option
-would be to run OCRmyPDF jobs inside a Docker container, a virtual machine,
-or a cloud instance, which can impose its own limits on CPU usage and be
-terminated "from orbit" if it fails to complete.
-
-Temporary storage requirements
-------------------------------
-
-OCRmyPDF will use a large amount of temporary storage for its work,
-proportional to the total number of pixels needed to rasterize the PDF.
-The raster image of a 8.5×11" color page at 300 DPI takes 25 MB
-uncompressed; OCRmyPDF saves its intermediates as PNG, but that still
-means it requires about 9 MB per intermediate based on average
-compression ratios. Multiple intermediates per page are also required,
-depending on the command line given. A rule of thumb would be to allow
-100 MB of temporary storage per page in a file – meaning that a small
-cloud servers or small VM partitions should be provisioned with plenty
-of extra space, if say, a 500 page file might be sent.
-
-To change the temporary directory, see :ref:`tmpdir`.
-
-On Amazon Web Services or other cloud vendors, consider setting your
-temporary directory to `empheral
-storage <https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/InstanceStorage.html>`__.
-
-Timeouts
---------
-
-To prevent excessively long OCR jobs consider setting
-``--tesseract-timeout`` and/or ``--skip-big`` arguments. ``--skip-big``
-is particularly helpful if your PDFs include documents such as reports
-on standard page sizes with large images attached - often large images
-are not worth OCR'ing anyway.
-
-Document management systems
----------------------------
-
-If you are looking for a full document management system, consider
-`paperless-ngx <https://github.com/paperless-ngx/paperless-ngx>`__,
-which is a web application that uses OCRmyPDF to automatically OCR and
-archive documents.
-
-Commercial OCR alternatives
----------------------------
-
-The author also provides professional services that include OCR and
-building databases around PDFs, and is happy to provide consultation.
-
-Abbyy Cloud OCR is viable commercial alternative with a web services
-API. Amazon Textract, Google Cloud Vision, and Microsoft Azure
-Computer Vision provide advanced OCR but have less PDF rendering capability.

docs/conf.py

@@ -26,23 +26,27 @@
 
 # -- General configuration ------------------------------------------------
 
-# If your documentation needs a minimal Sphinx version, state it here.
-#
-# needs_sphinx = '1.0'
+needs_sphinx = '8'
+
+import datetime
 
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
 extensions = [
+    'myst_parser',
     'sphinx.ext.autodoc',
     'sphinx.ext.intersphinx',
     'sphinx.ext.autosummary',
     'sphinx.ext.napoleon',
+    'sphinx.ext.imgconverter',  # PDF docs needs this for SVG to PNG conversion
     'sphinx_issues',
 ]
 
+myst_enable_extensions = ['colon_fence', 'attrs_block', 'attrs_inline', 'substitution']
+
 # Extension settings
-intersphinx_mapping = {'https://docs.python.org/': None}
+intersphinx_mapping = {'python': ('https://docs.python.org/3', None)}
 napoleon_use_rtype = False
 issues_github_path = "ocrmypdf/OCRmyPDF"
 
@@ -50,22 +54,18 @@ issues_github_path = "ocrmypdf/OCRmyPDF"
 templates_path = ['_templates']
 
 # The suffix(es) of source filenames.
-# You can specify multiple suffix as a list of string:
-#
-# source_suffix = ['.rst', '.md']
-source_suffix = '.rst'
-
-# The encoding of source files.
-#
-# source_encoding = 'utf-8-sig'
+source_suffix = {'.rst': 'restructuredtext', '.md': 'markdown', '.txt': 'markdown'}
 
 # The master toctree document.
 master_doc = 'index'
 
 # General information about the project.
 project = 'ocrmypdf'
+
+year = str(datetime.date.today().year)
 copyright = (
-    '2023, James R. Barlow. Licensed under Creative Commons Attribution-ShareAlike 4.0.'
+    f'{year}, James R. Barlow. '
+    + 'Licensed under Creative Commons Attribution-ShareAlike 4.0'
 )
 author = 'James R. Barlow'
 
@@ -92,6 +92,7 @@ if on_rtd:
 
     MOCK_MODULES = [
         'pikepdf',
+        'pikepdf.canvas',
         'pikepdf.models',
         'pikepdf.models.metadata',
     ]
@@ -108,7 +109,7 @@ version = '.'.join(release.split('.')[:2])
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = None
+language = 'en'
 
 # There are two options for replacing |today|: either, you set today to some
 # non-false value, then it is used:
@@ -158,19 +159,18 @@ todo_include_todos = False
 
 # -- Options for HTML output ----------------------------------------------
 
-import sphinx_rtd_theme
+import sphinx_rtd_theme  # noqa: F401
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
 html_theme = 'sphinx_rtd_theme'
-html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
 # documentation.
 #
-html_theme_options = {'display_version': False}
+html_theme_options = {}
 
 # Add any paths that contain custom themes here, relative to this directory.
 # html_theme_path = []
@@ -198,7 +198,7 @@ html_theme_options = {'display_version': False}
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
-html_static_path = ['_static']
+# html_static_path = ['_static']
 
 # Add any extra paths that contain custom files (such as robots.txt or
 # .htaccess) here, relative to this directory. These files are copied

docs/contributing.md

@@ -0,0 +1,72 @@
+% SPDX-FileCopyrightText: 2025 James R. Barlow
+% SPDX-License-Identifier: CC-BY-SA-4.0
+
+# Contributing guidelines
+
+Contributions are welcome!
+
+## Big changes
+
+Please open a new issue to discuss or propose a major change. Not only
+is it fun to discuss big ideas, but we might save each other\'s time
+too. Perhaps some of the work you\'re contemplating is already half-done
+in a development branch.
+
+## Code style
+
+We use `ruff` for code formatting.
+The settings for these programs are in `pyproject.toml`. Pull requests
+should follow the style guide. One difference we use from \"black\"
+style is that strings shown to the user are always in double quotes
+(`"`) and strings for internal uses are in single quotes (`'`).
+
+## Tests
+
+New features should come with tests that confirm their correctness.
+
+## New dependencies
+
+If you are proposing a change that will require a new dependency, we
+prefer dependencies that are already packaged by Debian or Red Hat. This
+makes life much easier for our downstream package maintainers. A package
+that is only available on PyPI or GitHub, and not more widely packaged,
+may not be accepted.
+
+We are unlikely to accept a dependency on CUDA or other GPU-based
+libraries, because these are still difficult to package and install on
+many systems. We recommend implementing these changes as plugins.
+
+Python dependencies must also be license-compatible. GPLv3 or AGPLv3 are
+likely incompatible with the project\'s license, but LGPLv3 is
+compatible.
+
+## New non-Python dependencies
+
+OCRmyPDF uses several external programs (Tesseract, Ghostscript and
+others) for its functionality. In general we prefer to avoid adding new
+external programs, and if we are to add external programs, we prefer
+those that are already packaged by Debian or Red Hat.
+
+## Plugins
+
+Some new features may be a good fit for a plugin. Plugins are a way to
+add features to OCRmyPDF without adding them to the core program.
+Plugins are installed separately from OCRmyPDF. They are written in
+Python and can be installed from PyPI. See the [plugin
+documentation](https://ocrmypdf.readthedocs.io/en/latest/plugins.html).
+
+We are happy to link users to your plugin from the documentation.
+
+## Style guide: Is it OCRmyPDF or ocrmypdf?
+
+The program/project is OCRmyPDF and the name of the executable or
+library is ocrmypdf.
+
+## Copyright and license
+
+For contributions over 10 lines of code, please add your name to list of
+copyright holders for that file. The core program is licensed under
+MPL-2.0, test files and documentation under CC-BY-SA 4.0, and
+miscellaneous files under MIT, with a few minor exceptions. Please
+contribute only content that you own or have the right to contribute
+under these licenses.

docs/contributing.rst

@@ -1,77 +0,0 @@
-.. SPDX-FileCopyrightText: 2022 James R. Barlow
-..
-.. SPDX-License-Identifier: CC-BY-SA-4.0
-
-=======================
-Contributing guidelines
-=======================
-
-Contributions are welcome!
-
-Big changes
-===========
-
-Please open a new issue to discuss or propose a major change. Not only is it fun
-to discuss big ideas, but we might save each other's time too. Perhaps some of the
-work you're contemplating is already half-done in a development branch.
-
-Code style
-==========
-
-We use PEP8, ``black`` for code formatting and ``ruff`` for everything else. The
-settings for these programs are in ``pyproject.toml``. Pull
-requests should follow the style guide. One difference we use from "black" style
-is that strings shown to the user are always in double quotes (``"``) and strings
-for internal uses are in single quotes (``'``).
-
-Tests
-=====
-
-New features should come with tests that confirm their correctness.
-
-New dependencies
-================
-
-If you are proposing a change that will require a new dependency, we
-prefer dependencies that are already packaged by Debian or Red Hat. This makes
-life much easier for our downstream package maintainers. A package that is only
-available on PyPI or GitHub, and not more widely packaged, may not be accepted.
-
-We are unlikely to accept a dependency on CUDA or other GPU-based libraries,
-because these are still difficult to package and install on many systems.
-We recommend implementing these changes as plugins.
-
-Python dependencies must also be license-compatible. GPLv3 or AGPLv3 are likely
-incompatible with the project's license, but LGPLv3 is compatible.
-
-New non-Python dependencies
-===========================
-
-OCRmyPDF uses several external programs (Tesseract, Ghostscript and others) for
-its functionality. In general we prefer to avoid adding new external programs,
-and if we are to add external programs, we prefer those that are already
-packaged by Debian or Red Hat.
-
-Plugins
-=======
-
-Some new features may be a good fit for a plugin. Plugins are a way to add
-features to OCRmyPDF without adding them to the core program. Plugins are
-installed separately from OCRmyPDF. They are written in Python and can be
-installed from PyPI. See the `plugin documentation <https://ocrmypdf.readthedocs.io/en/latest/plugins.html>`_.
-
-We are happy to link users to your plugin from the documentation.
-
-Style guide: Is it OCRmyPDF or ocrmypdf?
-========================================
-
-The program/project is OCRmyPDF and the name of the executable or library is ocrmypdf.
-
-Copyright and license
-=====================
-
-For contributions over 10 lines of code, please add your name to list of
-copyright holders for that file. The core program is licensed under MPL-2.0,
-test files and documentation under CC-BY-SA 4.0, and miscellaneous files under
-MIT, with a few minor exceptions. Please contribute only content that you own
-or have the right to contribute under these licenses.

docs/cookbook.md

@@ -0,0 +1,369 @@
+% SPDX-FileCopyrightText: 2025 James R. Barlow
+% SPDX-License-Identifier: CC-BY-SA-4.0
+
+# Cookbook
+
+## Basic examples
+
+### Help!
+
+ocrmypdf has built-in help.
+
+```bash
+ocrmypdf --help
+```
+
+### Add an OCR layer and convert to PDF/A
+
+```bash
+ocrmypdf input.pdf output.pdf
+```
+
+### Add an OCR layer and output a standard PDF
+
+```bash
+ocrmypdf --output-type pdf input.pdf output.pdf
+```
+
+### Create a PDF/A with all color and grayscale images converted to JPEG
+
+```bash
+ocrmypdf --output-type pdfa --pdfa-image-compression jpeg input.pdf output.pdf
+```
+
+### Modify a file in place
+
+The file will only be overwritten if OCRmyPDF is successful.
+
+```bash
+ocrmypdf myfile.pdf myfile.pdf
+```
+
+### Correct page rotation
+
+OCR will attempt to automatic correct the rotation of each page. This
+can help fix a scanning job that contains a mix of landscape and
+portrait pages.
+
+```bash
+ocrmypdf --rotate-pages myfile.pdf myfile.pdf
+```
+
+You can increase (decrease) the parameter `--rotate-pages-threshold` to
+make page rotation more (less) aggressive. The threshold number is the
+ratio of how confidence the OCR engine is that the document image should
+be changed, compared to kept the same. The default value is quite
+conservative; on some files it may not attempt rotations at all unless
+it is very confident that the current rotation is wrong. A lower value
+of `2.0` will produce more rotations, and more false positives. Run with
+`-v1` to see the confidence level for each page to see if there may be a
+better value for your files.
+
+If the page is \"just a little off horizontal\", like a crooked picture,
+then you want `--deskew`. `--rotate-pages` is for when the cardinal
+angle is wrong.
+
+### OCR languages other than English
+
+OCRmyPDF assumes the document is in English unless told otherwise. OCR
+quality may be poor if the wrong language is used.
+
+```bash
+ocrmypdf -l fra LeParisien.pdf LeParisien.pdf
+ocrmypdf -l eng+fra Bilingual-English-French.pdf Bilingual-English-French.pdf
+```
+
+Language packs must be installed for all languages specified. See
+`Installing additional language packs <lang-packs>`{.interpreted-text
+role="ref"}.
+
+Unfortunately, the Tesseract OCR engine has no ability to detect the
+language when it is unknown.
+
+### Produce PDF and text file containing OCR text
+
+This produces a file named \"output.pdf\" and a companion text file
+named \"output.txt\".
+
+```bash
+ocrmypdf --sidecar output.txt input.pdf output.pdf
+```
+
+:::{note}
+The sidecar file contains the **OCR text** found by OCRmyPDF. If the
+document contains pages that already have text, that text will not
+appear in the sidecar. If the option `--pages` is used, only those pages
+on which OCR was performed will be included in the sidecar. If certain
+pages were skipped because of options like `--skip-big` or
+`--tesseract-timeout`, those pages will not be in the sidecar.
+
+If you don\'t want to generate the output PDF, use `--output-type=none`
+to avoid generating one. Set the output filename to `-` (i.e. redirect
+to stdout).
+
+To extract all text from a PDF, whether generated from OCR or otherwise,
+use a program like Poppler\'s `pdftotext` or `pdfgrep`.
+:::
+
+### OCR images, not PDFs
+
+#### Option: use Tesseract
+
+If you are starting with images, you can just use Tesseract directly to
+convert images to PDFs:
+
+```bash
+tesseract my-image.jpg output-prefix pdf
+```
+
+```bash
+# When there are multiple images
+tesseract text-file-containing-list-of-image-filenames.txt output-prefix pdf
+```
+
+Tesseract\'s PDF output is quite good -- OCRmyPDF uses it internally, in
+some cases. However, OCRmyPDF has many features not available in
+Tesseract like image processing, metadata control, and PDF/A generation.
+
+#### Option: use img2pdf
+
+You can also use a program like
+[img2pdf](https://gitlab.mister-muffin.de/josch/img2pdf) to convert your
+images to PDFs, and then pipe the results to run ocrmypdf. The `-` tells
+ocrmypdf to read standard input.
+
+```bash
+img2pdf my-images*.jpg | ocrmypdf - myfile.pdf
+```
+
+`img2pdf` is recommended because it does an excellent job at generating
+PDFs without transcoding images.
+
+#### Option: use OCRmyPDF (single images only)
+
+For convenience, OCRmyPDF can also convert single images to PDFs on its
+own. If the resolution (dots per inch, DPI) of an image is not set or is
+incorrect, it can be overridden with `--image-dpi`. (As 1 inch is 2.54
+cm, 1 dpi = 0.39 dpcm).
+
+```bash
+ocrmypdf --image-dpi 300 image.png myfile.pdf
+```
+
+If you have multiple images, you must use `img2pdf` to convert the
+images to PDF.
+
+#### Not recommended
+
+We caution against using ImageMagick or Ghostscript to convert images to
+PDF, since they may transcode images or produce downsampled images,
+sometimes without warning.
+
+(image-processing)=
+
+## Image processing
+
+OCRmyPDF perform some image processing on each page of a PDF, if
+desired. The same processing is applied to each page. It is suggested
+that the user review files after image processing as these commands
+might remove desirable content, especially from poor quality scans.
+
+-   `--rotate-pages` attempts to determine the correct orientation for
+    each page and rotates the page if necessary.
+-   `--remove-background` attempts to detect and remove a noisy
+    background from grayscale or color images. Monochrome images are
+    ignored. This should not be used on documents that contain color
+    photos as it may remove them.
+-   `--deskew` will correct pages that were scanned at a skewed angle by
+    rotating them back into place.
+-   `--clean` uses [unpaper](https://www.flameeyes.eu/projects/unpaper)
+    to clean up pages before OCR, but does not alter the final output.
+    This makes it less likely that OCR will try to find text in
+    background noise.
+-   `--clean-final` uses unpaper to clean up pages before OCR and
+    inserts the page into the final output. You will want to review each
+    page to ensure that unpaper did not remove something important.
+
+:::{note}
+In many cases image processing will rasterize PDF pages as images,
+potentially losing quality.
+:::
+
+:::{warning}
+`--clean-final` and `--remove-background` may leave undesirable visual
+artifacts in some images where their algorithms have shortcomings. Files
+should be visually reviewed after using these options.
+:::
+
+### Example: OCR and correct document skew (crooked scan)
+
+Deskew:
+
+```bash
+ocrmypdf --deskew input.pdf output.pdf
+```
+
+Image processing commands can be combined. The order in which options
+are given does not matter. OCRmyPDF always applies the steps of the
+image processing pipeline in the same order (rotate, remove background,
+deskew, clean).
+
+```bash
+ocrmypdf --deskew --clean --rotate-pages input.pdf output.pdf
+```
+
+Don\'t actually OCR my PDF
+--------------------------
+
+If you set `--tesseract-timeout 0` OCRmyPDF will apply its image
+processing without performing OCR (by causing OCR to time out). This
+works if all you want to is to apply image processing or PDF/A
+conversion.
+
+```bash
+ocrmypdf --tesseract-timeout=0 --remove-background input.pdf output.pdf
+```
+
+:::{versionchanged} v14.1.0
+
+Prior to this version, `--tesseract-timeout 0` would prevent other uses
+of Tesseract, such as deskewing, from working. This is no longer the
+case. Use `--tesseract-non-ocr-timeout` to control the timeout for
+non-OCR operations, if needed.
+:::
+
+### Remove all text or OCR from my PDF
+
+This is getting ridiculous, but OCRmyPDF can complete strip all textual
+information from a PDF and reconstruct it as a \"bag of images\" PDF.
+
+```bash
+ocrmypdf --tesseract-timeout 0 --force-ocr input.pdf output.pdf
+```
+
+Why would you want to do this? Perhaps you have a PDF where OCR fails to
+produce useful results, and just want to get rid of all OCR information.
+This command also removes OCR generated by third party tools.
+
+### Optimize images without performing OCR
+
+You can also optimize all images without performing any OCR:
+
+```bash
+ocrmypdf --tesseract-timeout=0 --optimize 3 --skip-text input.pdf output.pdf
+```
+
+### Process only certain pages
+
+You can ask OCRmyPDF to only apply [image processing](#image-processing)
+and OCR to certain pages.
+
+```bash
+ocrmypdf --pages 2,3,13-17 input.pdf output.pdf
+```
+
+Hyphens denote a range of pages and commas separate page numbers. If you
+prefer to use spaces, quote all of the page numbers:
+`--pages '2, 3, 5, 7'`.
+
+OCRmyPDF will warn if your list of page numbers contains duplicates or
+overlapping pages. OCRmyPDF does not currently account for document page
+numbers, such as an introduction section of a book that uses Roman
+numerals. It simply counts the number of virtual pieces of paper since
+the start. If your list of pages is out of numerical order, OCRmyPDF
+will sort it for you.
+
+Regardless of the argument to `--pages`, OCRmyPDF will optimize all
+pages/images in the file and convert it to PDF/A, unless you disable
+those options. Both of these steps are \"whole file\" operations. In
+this example, we want to OCR only the title and otherwise change the PDF
+as little as possible:
+
+```bash
+ocrmypdf --pages 1 --output-type pdf --optimize 0 input.pdf output.pdf
+```
+
+## Redo existing OCR
+
+To redo OCR on a file OCRed with other OCR software or a previous
+version of OCRmyPDF and/or Tesseract, you may use the `--redo-ocr`
+argument. (Normally, OCRmyPDF will exit with an error if asked to modify
+a file with OCR.)
+
+This may be helpful for users who want to take advantage of accuracy
+improvements in Tesseract for files they previously OCRed with an
+earlier version of Tesseract and OCRmyPDF.
+
+```bash
+ocrmypdf --redo-ocr input.pdf output.pdf
+```
+
+This method will replace OCR without rasterizing, reducing quality or
+removing vector content. If a file contains a mix of pure digital text
+and OCR, digital text will be ignored and OCR will be replaced. As such
+this mode is incompatible with image processing options, since they
+alter the appearance of the file.
+
+In some cases, existing OCR cannot be detected or replaced. Files
+produced by OCRmyPDF v2.2 or earlier, for example, are internally
+represented as having visible text with an opaque image drawn on top.
+This situation cannot be detected.
+
+If `--redo-ocr` does not work, you can use `--force-ocr`, which will
+force rasterization of all pages, potentially reducing quality or losing
+vector content.
+
+Improving OCR quality
+---------------------
+
+The [Image processing](#image-processing) features can improve OCR
+quality.
+
+Rotating pages and deskewing helps to ensure that the page orientation
+is correct before OCR begins. Removing the background and/or cleaning
+the page can also improve results. The `--oversample DPI` argument can
+be specified to resample images to higher resolution before attempting
+OCR; this can improve results as well.
+
+OCR quality will suffer if the resolution of input images is not correct
+(since the range of pixel sizes that will be checked for possible fonts
+will also be incorrect).
+
+## PDF optimization
+
+By default OCRmyPDF will attempt to perform lossless optimizations on
+the images inside PDFs after OCR is complete. Optimization is performed
+even if no OCR text is found.
+
+The `--optimize N` (short form `-O`) argument controls optimization,
+where `N` ranges from 0 to 3 inclusive, analogous to the optimization
+levels in the GCC compiler. `-O1` is the default.
+
+For further details, see the section on [PDF optimization](optimizer).
+
+```bash
+ocrmypdf --optimize 3 in.pdf out.pdf  # Make it small
+```
+
+Some users may consider enabling lossy JBIG2. See:
+`jbig2-lossy`{.interpreted-text role="ref"}.
+
+:::{note}
+Image processing and PDF/A conversion can also introduce lossy
+transformations to your PDF images, even when `--optimize 1` is in use.
+:::
+
+Digitally signed PDFs
+---------------------
+
+OCRmyPDF cannot preserve digital signatures in PDFs and also add OCR to
+them. By default, it will refuse to modify a signed PDF regardless of
+other settings. You can override this behavior with
+`--invalidate-digital-signatures`; as the name suggests, any digital
+signatures will be invalidated.
+
+OCRmyPDF cannot open documents that are encrypted with a digital
+certificate.
+
+Versions of OCRmyPDF prior to 14.4.0 would invalidate existing digital
+signatures without warning.

docs/cookbook.rst

@@ -1,410 +0,0 @@
-.. SPDX-FileCopyrightText: 2022 James R. Barlow
-..
-.. SPDX-License-Identifier: CC-BY-SA-4.0
-
-========
-Cookbook
-========
-
-Basic examples
-==============
-
-Help!
------
-
-ocrmypdf has built-in help.
-
-.. code-block:: bash
-
-    ocrmypdf --help
-
-Add an OCR layer and convert to PDF/A
--------------------------------------
-
-.. code-block:: bash
-
-    ocrmypdf input.pdf output.pdf
-
-Add an OCR layer and output a standard PDF
-------------------------------------------
-
-.. code-block:: bash
-
-    ocrmypdf --output-type pdf input.pdf output.pdf
-
-Create a PDF/A with all color and grayscale images converted to JPEG
---------------------------------------------------------------------
-
-.. code-block:: bash
-
-    ocrmypdf --output-type pdfa --pdfa-image-compression jpeg input.pdf output.pdf
-
-Modify a file in place
-----------------------
-
-The file will only be overwritten if OCRmyPDF is successful.
-
-.. code-block:: bash
-
-    ocrmypdf myfile.pdf myfile.pdf
-
-Correct page rotation
----------------------
-
-OCR will attempt to automatic correct the rotation of each page. This
-can help fix a scanning job that contains a mix of landscape and
-portrait pages.
-
-.. code-block:: bash
-
-    ocrmypdf --rotate-pages myfile.pdf myfile.pdf
-
-You can increase (decrease) the parameter ``--rotate-pages-threshold``
-to make page rotation more (less) aggressive. The threshold number is the ratio
-of how confidence the OCR engine is that the document image should be changed,
-compared to kept the same. The default value is quite conservative; on some files
-it may not attempt rotations at all unless it is very confident that the current
-rotation is wrong. A lower value of ``2.0`` will produce more rotations, and
-more false positives. Run with ``-v1`` to see the confidence level for each
-page to see if there may be a better value for your files.
-
-If the page is "just a little off horizontal", like a crooked picture,
-then you want ``--deskew``. ``--rotate-pages`` is for when the cardinal
-angle is wrong.
-
-OCR languages other than English
---------------------------------
-
-OCRmyPDF assumes the document is in English unless told otherwise. OCR
-quality may be poor if the wrong language is used.
-
-.. code-block:: bash
-
-    ocrmypdf -l fra LeParisien.pdf LeParisien.pdf
-    ocrmypdf -l eng+fra Bilingual-English-French.pdf Bilingual-English-French.pdf
-
-Language packs must be installed for all languages specified. See
-:ref:`Installing additional language packs <lang-packs>`.
-
-Unfortunately, the Tesseract OCR engine has no ability to detect the
-language when it is unknown.
-
-Produce PDF and text file containing OCR text
----------------------------------------------
-
-This produces a file named "output.pdf" and a companion text file named
-"output.txt".
-
-.. code-block:: bash
-
-    ocrmypdf --sidecar output.txt input.pdf output.pdf
-
-.. note::
-
-    The sidecar file contains the **OCR text** found by OCRmyPDF. If the document
-    contains pages that already have text, that text will not appear in the
-    sidecar. If the option ``--pages`` is used, only those pages on which OCR
-    was performed will be included in the sidecar. If certain pages were skipped
-    because of options like ``--skip-big`` or ``--tesseract-timeout``, those pages
-    will not be in the sidecar.
-
-    If you don't want to generate the output PDF, use ``--output-type=none`` to
-    avoid generating one. Set the output filename to ``-`` (i.e. redirect to stdout).
-
-    To extract all text from a PDF, whether generated from OCR or otherwise,
-    use a program like Poppler's ``pdftotext`` or ``pdfgrep``.
-
-OCR images, not PDFs
---------------------
-
-Option: use Tesseract
-~~~~~~~~~~~~~~~~~~~~~
-
-If you are starting with images, you can just use Tesseract directly to
-convert images to PDFs:
-
-.. code-block:: bash
-
-    tesseract my-image.jpg output-prefix pdf
-
-.. code-block:: bash
-
-    # When there are multiple images
-    tesseract text-file-containing-list-of-image-filenames.txt output-prefix pdf
-
-Tesseract's PDF output is quite good – OCRmyPDF uses it internally, in
-some cases. However, OCRmyPDF has many features not available in
-Tesseract like image processing, metadata control, and PDF/A generation.
-
-Option: use img2pdf
-~~~~~~~~~~~~~~~~~~~
-
-You can also use a program like
-`img2pdf <https://gitlab.mister-muffin.de/josch/img2pdf>`__ to convert
-your images to PDFs, and then pipe the results to run ocrmypdf. The
-``-`` tells ocrmypdf to read standard input.
-
-.. code-block:: bash
-
-    img2pdf my-images*.jpg | ocrmypdf - myfile.pdf
-
-``img2pdf`` is recommended because it does an excellent job at
-generating PDFs without transcoding images.
-
-Option: use OCRmyPDF (single images only)
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-For convenience, OCRmyPDF can also convert single images to PDFs on its
-own. If the resolution (dots per inch, DPI) of an image is not set or is
-incorrect, it can be overridden with ``--image-dpi``. (As 1 inch is 2.54
-cm, 1 dpi = 0.39 dpcm).
-
-.. code-block:: bash
-
-    ocrmypdf --image-dpi 300 image.png myfile.pdf
-
-If you have multiple images, you must use ``img2pdf`` to convert the
-images to PDF.
-
-Not recommended
-~~~~~~~~~~~~~~~
-
-We caution against using ImageMagick or Ghostscript to convert images to
-PDF, since they may transcode images or produce downsampled images,
-sometimes without warning.
-
-Image processing
-================
-
-OCRmyPDF perform some image processing on each page of a PDF, if
-desired. The same processing is applied to each page. It is suggested
-that the user review files after image processing as these commands
-might remove desirable content, especially from poor quality scans.
-
--  ``--rotate-pages`` attempts to determine the correct orientation for
-   each page and rotates the page if necessary.
--  ``--remove-background`` attempts to detect and remove a noisy
-   background from grayscale or color images. Monochrome images are
-   ignored. This should not be used on documents that contain color
-   photos as it may remove them.
--  ``--deskew`` will correct pages that were scanned at a skewed angle by
-   rotating them back into place.
--  ``--clean`` uses
-   `unpaper <https://www.flameeyes.eu/projects/unpaper>`__ to clean up
-   pages before OCR, but does not alter the final output. This makes it
-   less likely that OCR will try to find text in background noise.
--  ``--clean-final`` uses unpaper to clean up pages before OCR and
-   inserts the page into the final output. You will want to review each
-   page to ensure that unpaper did not remove something important.
-
-.. note::
-
-   In many cases image processing will rasterize PDF pages as images,
-   potentially losing quality.
-
-.. warning::
-
-   ``--clean-final`` and ``--remove-background`` may leave undesirable
-   visual artifacts in some images where their algorithms have
-   shortcomings. Files should be visually reviewed after using these
-   options.
-
-Example: OCR and correct document skew (crooked scan)
------------------------------------------------------
-
-Deskew:
-
-.. code-block:: bash
-
-    ocrmypdf --deskew input.pdf output.pdf
-
-Image processing commands can be combined. The order in which options
-are given does not matter. OCRmyPDF always applies the steps of the
-image processing pipeline in the same order (rotate, remove background,
-deskew, clean).
-
-.. code-block:: bash
-
-    ocrmypdf --deskew --clean --rotate-pages input.pdf output.pdf
-
-Don't actually OCR my PDF
-=========================
-
-If you set ``--tesseract-timeout 0`` OCRmyPDF will apply its image
-processing without performing OCR (by causing OCR to time out). This works
-if all you want to is to apply image processing or PDF/A conversion.
-
-.. code-block:: bash
-
-    ocrmypdf --tesseract-timeout=0 --remove-background input.pdf output.pdf
-
-.. versionchanged:: v14.1.0
-
-    Prior to this version, ``--tesseract-timeout 0`` would prevent other
-    uses of Tesseract, such as deskewing, from working. This is no longer
-    the case. Use ``--tesseract-non-ocr-timeout`` to control the timeout
-    for non-OCR operations, if needed.
-
-Remove all text or OCR from my PDF
-----------------------------------
-
-This is getting ridiculous, but OCRmyPDF can complete strip all textual
-information from a PDF and reconstruct it as a "bag of images" PDF.
-
-.. code-block::
-
-    ocrmypdf --tesseract-timeout 0 --force-ocr input.pdf output.pdf
-
-Why would you want to do this? Perhaps you have a PDF where OCR
-fails to produce useful results, and just want to get rid of all OCR information.
-This command also removes OCR generated by third party tools.
-
-Optimize images without performing OCR
---------------------------------------
-
-You can also optimize all images without performing any OCR:
-
-.. code-block:: bash
-
-    ocrmypdf --tesseract-timeout=0 --optimize 3 --skip-text input.pdf output.pdf
-
-Process only certain pages
---------------------------
-
-You can ask OCRmyPDF to only apply `image processing <#image-processing>`__
-and OCR to certain pages.
-
-.. code-block:: bash
-
-    ocrmypdf --pages 2,3,13-17 input.pdf output.pdf
-
-Hyphens denote a range of pages and commas separate page numbers. If you prefer
-to use spaces, quote all of the page numbers: ``--pages '2, 3, 5, 7'``.
-
-OCRmyPDF will warn if your list of page numbers contains duplicates or
-overlapping pages. OCRmyPDF does not currently account for document page numbers,
-such as an introduction section of a book that uses Roman numerals. It simply
-counts the number of virtual pieces of paper since the start. If your list of
-pages is out of numerical order, OCRmyPDF will sort it for you.
-
-Regardless of the argument to ``--pages``, OCRmyPDF will optimize all pages/images
-in the file and convert it to PDF/A, unless you disable those options. Both of these
-steps are "whole file" operations. In this example, we want to OCR only the title
-and otherwise change the PDF as little as possible:
-
-.. code-block:: bash
-
-    ocrmypdf --pages 1 --output-type pdf --optimize 0 input.pdf output.pdf
-
-Redo existing OCR
-=================
-
-To redo OCR on a file OCRed with other OCR software or a previous
-version of OCRmyPDF and/or Tesseract, you may use the ``--redo-ocr``
-argument. (Normally, OCRmyPDF will exit with an error if asked to modify
-a file with OCR.)
-
-This may be helpful for users who want to take advantage of accuracy
-improvements in Tesseract for files they previously OCRed with an
-earlier version of Tesseract and OCRmyPDF.
-
-.. code-block:: bash
-
-    ocrmypdf --redo-ocr input.pdf output.pdf
-
-This method will replace OCR without rasterizing, reducing quality or
-removing vector content. If a file contains a mix of pure digital text
-and OCR, digital text will be ignored and OCR will be replaced. As such
-this mode is incompatible with image processing options, since they
-alter the appearance of the file.
-
-In some cases, existing OCR cannot be detected or replaced. Files
-produced by OCRmyPDF v2.2 or earlier, for example, are internally
-represented as having visible text with an opaque image drawn on top.
-This situation cannot be detected.
-
-If ``--redo-ocr`` does not work, you can use ``--force-ocr``, which will
-force rasterization of all pages, potentially reducing quality or losing
-vector content.
-
-Improving OCR quality
-=====================
-
-The `Image processing <#image-processing>`__ features can improve OCR
-quality.
-
-Rotating pages and deskewing helps to ensure that the page orientation
-is correct before OCR begins. Removing the background and/or cleaning
-the page can also improve results. The ``--oversample DPI`` argument can
-be specified to resample images to higher resolution before attempting
-OCR; this can improve results as well.
-
-OCR quality will suffer if the resolution of input images is not correct
-(since the range of pixel sizes that will be checked for possible fonts
-will also be incorrect).
-
-PDF optimization
-================
-
-By default OCRmyPDF will attempt to perform lossless optimizations on
-the images inside PDFs after OCR is complete. Optimization is performed
-even if no OCR text is found.
-
-The ``--optimize N`` (short form ``-O``) argument controls optimization,
-where ``N`` ranges from 0 to 3 inclusive, analogous to the optimization
-levels in the GCC compiler.
-
-.. list-table::
-    :widths: auto
-    :header-rows: 1
-
-    *   - Level
-        - Comments
-    *   - ``--optimize 0``
-        - Disables optimization.
-    *   - ``--optimize 1``
-        - Enables lossless optimizations, such as transcoding images to more
-          efficient formats. Also compress other uncompressed objects in the
-          PDF and enables the more efficient "object streams" within the PDF.
-          (If ``--jbig2-lossy`` is issued, then lossy JBIG2 optimization is used.
-          The decision to use lossy JBIG2 is separate from standard optimization
-          settings.)
-    *   - ``--optimize 2``
-        - All of the above, and enables lossy optimizations and color quantization.
-    *   - ``--optimize 3``
-        - All of the above, and enables more aggressive optimizations and targets lower image quality.
-
-Optimization is improved when a JBIG2 encoder is available and when
-``pngquant`` is installed. If either of these components are missing,
-then some types of images cannot be optimized.
-
-The types of optimization available may expand over time. By default,
-OCRmyPDF compresses data streams inside PDFs, and will change
-inefficient compression modes to more modern versions. A program like
-``qpdf`` can be used to change encodings, e.g. to inspect the internals
-for a PDF.
-
-.. code-block:: bash
-
-    ocrmypdf --optimize 3 in.pdf out.pdf  # Make it small
-
-Some users may consider enabling lossy JBIG2. See: :ref:`jbig2-lossy`.
-
-.. note::
-
-    Image processing and PDF/A conversion can also introduce lossy transformations
-    to your PDF images, even when ``--optimize 1`` is in use.
-
-
-Digitally signed PDFs
-=====================
-
-OCRmyPDF cannot preserve digital signatures in PDFs and also add to OCR to them.
-By default, it will refuse to modify a signed PDF regardless of other settings. You can
-override this behavior with ``--invalidate-digital-signatures``; as the name suggests,
-any digital signatures will be invalidated.
-
-OCRmyPDF cannot open documents that are encrypted with a digital certificate.
-
-Versions of OCRmyPDF prior to 14.4.0 would invalidate existing digital signatures
-without warning.

docs/design_notes.md

@@ -0,0 +1,30 @@
+% SPDX-FileCopyrightText: 2023 James R. Barlow
+% SPDX-License-Identifier: CC-BY-SA-4.0
+
+# Design notes
+
+## Why doesn\'t OCRmyPDF use PyTesseract?
+
+PyTesseract is a Python wrapper around the Tesseract OCR engine. When
+OCRmyPDF was first written, PyTesseract used ABI bindings to call the
+Tesseract library. This was not a good fit for OCRmyPDF because ABI
+bindings can be fragile.
+
+PyTesseract has since evolved calling the Tesseract executable,
+abandoning the ABI approach and using the CLI instead, just like
+OCRmyPDF does. If it were written from scratch today, OCRmyPDF might use
+PyTesseract.
+
+PyTesseract has more features don\'t particularly need PDF output, but
+less features than OCRmyPDF\'s API for creating PDFs.
+
+## What is `executor()`?
+
+OCRmyPDF uses a custom concurrent executor which can support either
+threads or processes with the same interface. This is useful because
+OCRmyPDF can use either threads or processes to parallelize work,
+whichever is more appropriate for the task at hand.
+
+The interface is currently private and subject to change. In particular,
+if experiments with asyncio and anyio are successful, the interface will
+change.

docs/design_notes.rst

@@ -1,32 +0,0 @@
-.. SPDX-FileCopyrightText: 2023 James R. Barlow
-.. SPDX-License-Identifier: CC-BY-SA-4.0
-
-============
-Design notes
-============
-
-Why doesn't OCRmyPDF use PyTesseract?
-=====================================
-
-PyTesseract is a Python wrapper around the Tesseract OCR engine. When OCRmyPDF was
-first written, PyTesseract used ABI bindings to call the Tesseract library. This
-was not a good fit for OCRmyPDF because ABI bindings can be fragile.
-
-PyTesseract has since evolved calling the Tesseract executable, abandoning the ABI
-approach and using the CLI instead, just like OCRmyPDF does. If it were written from
-scratch today, OCRmyPDF might use PyTesseract.
-
-PyTesseract has more features don't particularly need PDF output, but less features
-than OCRmyPDF's API for creating PDFs.
-
-What is ``executor()``?
-=======================
-
-OCRmyPDF uses a custom concurrent executor which can support either threads or
-processes with the same interface. This is useful because OCRmyPDF can use
-either threads or processes to parallelize work, whichever is more appropriate
-for the task at hand.
-
-The interface is currently private and subject to change. In particular, if
-experiments with asyncio and anyio are successful, the interface will change.
-

docs/docker.md

@@ -0,0 +1,245 @@
+# OCRmyPDF Docker image {#docker}
+
+OCRmyPDF is also available in Docker images that packages recent
+versions of all dependencies.
+
+For users who already have Docker installed this may be an easy and
+convenient option.
+
+On platforms other than Linux, Docker runs in a virtual machine, and so
+may be less performant. You may also want to adjust the Docker virtual
+machine\'s memory and CPU allocation. On Linux, the Docker image runs
+natively and performance is comparable to a system installation.
+
+{#docker-install}
+## Installing the Docker image
+
+If you have [Docker](https://docs.docker.com/) installed on your system,
+you can install a Docker image of the latest release.
+
+If you can run this command successfully, your system is ready to
+download and execute the image:
+
+:::{code} bash
+docker run hello-world
+:::
+
+:::{list-table} Docker Images
+:header-rows: 1
+
+* - Image
+  - Architecture
+  - Description
+* - `jbarlow83/ocrmypdf-alpine`
+  - x86_64 and arm64
+  - Recommended image, based on Alpine Linux.
+* - `jbarlow83/ocrmypdf-ubuntu`
+  - x86_64 and arm64
+  - Alternate image, based on Ubuntu. When the Alpine image is considered stable and available for arm64, this image will be deprecated.
+* - `jbarlow83/ocrmypdf`
+  - x86_64 and arm64
+  - Currently an alias for ocrmypdf-ubuntu. When the Alpine image is considered stable and available for arm64, this name will point to the Alpine image. If you don\'t know about the difference between Alpine and Ubuntu, use this image.
+:::
+
+To install:
+
+:::{code} bash
+docker pull jbarlow83/ocrmypdf-alpine
+:::
+
+The `ocrmypdf` image is also available, but is deprecated and will be
+removed in the future.
+
+OCRmyPDF will use all available CPU cores. See the Docker documentation
+for [adjusting memory and CPU on other
+platforms](https://docs.docker.com/config/containers/resource_constraints/)
+if you are using Docker on macOS or Windows, where you may need to
+manually assign more resources. On Linux, all resources will be
+available automatically.
+
+The underlying operating system and other details in Docker images are
+considered implementation details and **subject to change at minor
+releases**. If you are modifying the image, you should pin the version
+you intend to use.
+
+## Using the Docker image on the command line
+
+**Unlike typical Docker containers**, in this section the OCRmyPDF
+Docker container is ephemeral -- it runs for one OCR job and terminates,
+just like a command line program. We are using Docker to deliver an
+application (as opposed to the more conventional case, where a Docker
+container runs as a server). For that reason we usually use the `--rm`
+argument to delete the container when it exits.
+
+To start a Docker container (instance of the image):
+
+:::{code} bash
+docker run --rm -i jbarlow83/ocrmypdf-alpine (... all other arguments here...) - -
+:::
+
+For convenience, create a shell alias to hide the Docker command. It is
+easier to send the input file as stdin and read the output from stdout
+-- **this avoids the messy permission issues with Docker entirely**.
+
+:::{code} bash
+alias docker_ocrmypdf='docker run --rm -i jbarlow83/ocrmypdf-alpine'
+docker_ocrmypdf --version  # runs docker version
+docker_ocrmypdf - - <input.pdf >output.pdf
+:::
+
+Or in the wonderful [fish shell](https://fishshell.com/):
+
+:::{code} fish
+alias docker_ocrmypdf 'docker run --rm jbarlow83/ocrmypdf-alpine'
+funcsave docker_ocrmypdf
+:::
+
+Alternately, you could mount the local current working directory as a
+Docker volume:
+
+:::{code} bash
+alias docker_ocrmypdf='docker run --rm  -i --user "$(id -u):$(id -g)" --workdir /data -v "$PWD:/data" jbarlow83/ocrmypdf-alpine'
+docker_ocrmypdf /data/input.pdf /data/output.pdf
+:::
+
+## Podman
+
+Especially if you use [Podman](https://podman.io/) (or have SELinux
+enabled on your system), you may need to add `--userns keep-id` there,
+otherwise you may get access errors, because the user is otherwise not
+mapped to the same UID as on the host:
+
+:::{code} bash
+alias podman_ocrmypdf='podman run --rm  -i --user "$(id -u):$(id -g)" --userns keep-id --workdir /data -v "$PWD:/data" ocrmypdf'
+podman_ocrmypdf /data/input.pdf /data/output.pdf
+:::
+
+If you use SELinux you may additionally need to add the `:Z` [suffix to
+the
+volume](https://docs.podman.io/en/stable/markdown/podman-run.1.html#volume-v-source-volume-host-dir-container-dir-options)
+or disable SELinux for the container using
+`--security-opt label=disable`, which is suggested for system files as
+they should not be re-labelled. Please refer to the „Note" section at
+the end of the linked podman documentation for details.
+
+{#docker-lang-packs}
+## Adding languages to the Docker image
+
+By default the Docker image includes English, German, Simplified
+Chinese, French, Portuguese and Spanish, the most popular languages for
+OCRmyPDF users based on feedback. You may add other languages by
+creating a new Dockerfile based on the public one.
+
+:::{code} dockerfile
+FROM jbarlow83/ocrmypdf
+
+# Example: add Italian
+RUN apt install tesseract-ocr-ita
+:::
+
+To install language packs (training data) such as the
+[tessdata\_best](https://github.com/tesseract-ocr/tessdata_best) suite
+or custom data, you first need to determine the version of Tesseract
+data files, which may differ from the Tesseract program version. Use
+this command to determine the data file version:
+
+:::{code} bash
+docker run -i --rm --entrypoint /bin/ls jbarlow83/ocrmypdf /usr/share/tesseract-ocr
+:::
+
+As of 2021, the data file version is probably `4.00`.
+
+You can then add new data with either a Dockerfile:
+
+:::{code} dockerfile
+FROM jbarlow83/ocrmypdf:{TAG}
+
+# Example: add a tessdata_best file
+COPY chi_tra_vert.traineddata /usr/share/tesseract-ocr/<data version>/tessdata/
+:::
+
+When creating your own image, you should always pin a specific version
+of the OCRmyPDF Docker image. This ensures that your image will not
+break when a new version of OCRmyPDF is released.
+
+Alternately, you can copy training data into a Docker container as
+follows:
+
+:::{code} bash
+docker cp mycustomtraining.traineddata name_of_container:/usr/share/tesseract-ocr/<tesseract version>/tessdata/
+:::
+
+Extending the Docker image
+--------------------------
+
+You can extend the Docker image with your own customizations, similar to
+the way it is extended to add language packs.
+
+Note that the Docker image is subject to change at any time. For
+example, the base image may be updated to a newer version of Ubuntu or
+Debian. Such changes will be noted in the release notes but might occur
+at minor versions releases, unless the way a \"casual\" user of the
+Docker image is affected.
+
+If you extend the Docker image, you should pin a specific version of the
+OCRmyPDF Docker image.
+
+Executing the test suite
+------------------------
+
+The OCRmyPDF test suite is installed with image. To run it:
+
+:::{code} bash
+docker run --rm --entrypoint python  jbarlow83/ocrmypdf -m pytest
+:::
+
+Accessing the shell
+-------------------
+
+To use the shell in the Docker image:
+
+:::{code} bash
+docker run -it --entrypoint sh  jbarlow83/ocrmypdf
+:::
+
+Using the OCRmyPDF web service wrapper
+--------------------------------------
+
+The OCRmyPDF Docker image includes an example, barebones HTTP web
+service. The webservice may be launched as follows:
+
+:::{code} bash
+docker run --entrypoint python -p 5000:5000  jbarlow83/ocrmypdf webservice.py
+:::
+
+We omit the `--rm` parameter so that the container will not be
+automatically deleted when it exits.
+
+This will configure the machine to listen on port 5000. On Linux
+machines this is port 5000 of localhost. On macOS or Windows machines
+running Docker, this is port 5000 of the virtual machine that runs your
+Docker images. You can find its IP address using the command
+`docker-machine ip`.
+
+Unlike command line usage this program will open a socket and wait for
+connections.
+
+:::{warning}
+The OCRmyPDF web service wrapper is intended for demonstration or
+development. It provides no security, no authentication, no protection
+against denial of service attacks, and no load balancing. The default
+Flask WSGI server is used, which is intended for development only. The
+server is single-threaded and so can respond to only one client at a
+time. While running OCR, it cannot respond to any other clients.
+:::
+
+Clients must keep their open connection while waiting for OCR to
+complete. This may entail setting a long timeout; this interface is more
+useful for internal HTTP API calls.
+
+Unlike the rest of OCRmyPDF, this web service is licensed under the
+Affero GPLv3 (AGPLv3) since Ghostscript is also licensed in this way.
+
+In addition to the above, please read our
+`general remarks on using OCRmyPDF as a service <ocr-service>`{.interpreted-text
+role="ref"}.

docs/docker.rst

@@ -1,231 +0,0 @@
-.. SPDX-FileCopyrightText: 2022 James R. Barlow
-..
-.. SPDX-License-Identifier: CC-BY-SA-4.0
-
-.. _docker:
-
-=====================
-OCRmyPDF Docker image
-=====================
-
-OCRmyPDF is also available in Docker images that packages recent
-versions of all dependencies.
-
-For users who already have Docker installed this may be an easy and
-convenient option.
-
-On platforms other than Linux, Docker runs in a virtual machine, and so may
-be less performant. You may also want to adjust the Docker virtual machine's
-memory and CPU allocation. On Linux, the Docker image runs natively and
-performance is comparable to a system installation.
-
-.. _docker-install:
-
-Installing the Docker image
-===========================
-
-If you have `Docker <https://docs.docker.com/>`__ installed on your
-system, you can install a Docker image of the latest release.
-
-If you can run this command successfully, your system is ready to download and
-execute the image:
-
-.. code-block:: bash
-
-   docker run hello-world
-
-.. list-table:: Docker images
-   :width: 30 20 50
-   :header-rows: 1
-
-   * - Image
-     - Architecture
-     - Description
-   * - ``jbarlow83/ocrmypdf-alpine``
-     - x86_64 and arm64
-     - Recommended image, based on Alpine Linux.
-   * - ``jbarlow83/ocrmypdf-ubuntu``
-     - x86_64 and arm64
-     - Alternate image, based on Ubuntu. When the Alpine image is considered
-       stable and available for arm64, this image will be deprecated.
-   * - ``jbarlow83/ocrmypdf``
-     - x86_64 and arm64
-     - Currently an alias for ocrmypdf-ubuntu. When the Alpine image is
-       considered stable and available for arm64, this name point to the
-       Alpine image. If you don't about the difference between Alpine and
-       Ubuntu, use this image.
-
-To install:
-
-.. code-block:: bash
-
-   docker pull jbarlow83/ocrmypdf-alpine
-
-The ``ocrmypdf`` image is also available, but is deprecated and will be removed
-in the future.
-
-OCRmyPDF will use all available CPU cores. See the Docker documentation for
-`adjusting memory and CPU on other platforms <https://docs.docker.com/config/containers/resource_constraints/>`__.
-
-Using the Docker image on the command line
-==========================================
-
-**Unlike typical Docker containers**, in this section the OCRmyPDF Docker
-container is ephemeral – it runs for one OCR job and terminates, just like a
-command line program. We are using Docker to deliver an application (as opposed
-to the more conventional case, where a Docker container runs as a server).
-For that reason we usually use the ``--rm`` argument to delete the container
-when it exits.
-
-To start a Docker container (instance of the image):
-
-.. code-block:: bash
-
-   docker tag jbarlow83/ocrmypdf-alpine ocrmypdf
-   docker run --rm -i ocrmypdf (... all other arguments here...) - -
-
-For convenience, create a shell alias to hide the Docker command. It is
-easier to send the input file as stdin and read the output from
-stdout – **this avoids the messy permission issues with Docker entirely**.
-
-.. code-block:: bash
-
-   alias docker_ocrmypdf='docker run --rm -i ocrmypdf'
-   docker_ocrmypdf --version  # runs docker version
-   docker_ocrmypdf - - <input.pdf >output.pdf
-
-Or in the wonderful `fish shell <https://fishshell.com/>`__:
-
-.. code-block:: fish
-
-   alias docker_ocrmypdf 'docker run --rm ocrmypdf'
-   funcsave docker_ocrmypdf
-
-Alternately, you could mount the local current working directory as a
-Docker volume:
-
-.. code-block:: bash
-
-   alias docker_ocrmypdf='docker run --rm  -i --user "$(id -u):$(id -g)" --workdir /data -v "$PWD:/data" ocrmypdf'
-   docker_ocrmypdf /data/input.pdf /data/output.pdf
-
-.. _docker-lang-packs:
-
-Adding languages to the Docker image
-====================================
-
-By default the Docker image includes English, German, Simplified Chinese,
-French, Portuguese and Spanish, the most popular languages for OCRmyPDF
-users based on feedback. You may add other languages by creating a new
-Dockerfile based on the public one.
-
-.. code-block:: dockerfile
-
-   FROM jbarlow83/ocrmypdf
-
-   # Example: add Italian
-   RUN apt install tesseract-ocr-ita
-
-To install language packs (training data) such as the
-`tessdata_best <https://github.com/tesseract-ocr/tessdata_best>`_ suite or
-custom data, you first need to determine the version of Tesseract data files, which
-may differ from the Tesseract program version. Use this command to determine the data
-file version:
-
-.. code-block:: bash
-
-   docker run -i --rm --entrypoint /bin/ls jbarlow83/ocrmypdf /usr/share/tesseract-ocr
-
-As of 2021, the data file version is probably ``4.00``.
-
-You can then add new data with either a Dockerfile:
-
-.. code-block:: dockerfile
-
-   FROM jbarlow83/ocrmypdf:{TAG}
-
-   # Example: add a tessdata_best file
-   COPY chi_tra_vert.traineddata /usr/share/tesseract-ocr/<data version>/tessdata/
-
-When creating your own image, you should always pin a specific version of the
-OCRmyPDF Docker image. This ensures that your image will not break when a new
-version of OCRmyPDF is released.
-
-Alternately, you can copy training data into a Docker container as follows:
-
-.. code-block:: bash
-
-   docker cp mycustomtraining.traineddata name_of_container:/usr/share/tesseract-ocr/<tesseract version>/tessdata/
-
-Extending the Docker image
-==========================
-
-You can extend the Docker image with your own customizations, similar to the way
-it is extended to add language packs.
-
-Note that the Docker image is subject to change at any time. For example, the base
-image may be updated to a newer version of Ubuntu or Debian. Such changes will be
-noted in the release notes but might occur at minor versions releases, unless the
-way a "casual" user of the Docker image is affected.
-
-If you extend the Docker image, you should pin a specific version of the OCRmyPDF
-Docker image.
-
-Executing the test suite
-========================
-
-The OCRmyPDF test suite is installed with image. To run it:
-
-.. code-block:: bash
-
-   docker run --rm --entrypoint python  jbarlow83/ocrmypdf -m pytest
-
-Accessing the shell
-===================
-
-To use the shell in the Docker image:
-
-.. code-block:: bash
-
-   docker run -it --entrypoint sh  jbarlow83/ocrmypdf
-
-Using the OCRmyPDF web service wrapper
-======================================
-
-The OCRmyPDF Docker image includes an example, barebones HTTP web
-service. The webservice may be launched as follows:
-
-.. code-block:: bash
-
-   docker run --entrypoint python -p 5000:5000  jbarlow83/ocrmypdf webservice.py
-
-We omit the ``--rm`` parameter so that the container will not be
-automatically deleted when it exits.
-
-This will configure the machine to listen on port 5000. On Linux machines
-this is port 5000 of localhost. On macOS or Windows machines running
-Docker, this is port 5000 of the virtual machine that runs your Docker
-images. You can find its IP address using the command ``docker-machine ip``.
-
-Unlike command line usage this program will open a socket and wait for
-connections.
-
-.. warning::
-
-   The OCRmyPDF web service wrapper is intended for demonstration or
-   development. It provides no security, no authentication, no
-   protection against denial of service attacks, and no load balancing.
-   The default Flask WSGI server is used, which is intended for
-   development only. The server is single-threaded and so can respond to
-   only one client at a time. While running OCR, it cannot respond to
-   any other clients.
-
-Clients must keep their open connection while waiting for OCR to
-complete. This may entail setting a long timeout; this interface is more
-useful for internal HTTP API calls.
-
-Unlike the rest of OCRmyPDF, this web service is licensed under the
-Affero GPLv3 (AGPLv3) since Ghostscript is also licensed in this way.
-
-In addition to the above, please read our
-:ref:`general remarks on using OCRmyPDF as a service <ocr-service>`.

docs/errors.md

@@ -0,0 +1,51 @@
+% SPDX-FileCopyrightText: 2022 James R. Barlow
+% SPDX-License-Identifier: CC-BY-SA-4.0
+
+# Common error messages
+
+## Page already has text
+
+:::{code}
+ERROR -    1: page already has text! – aborting (use --force-ocr to force OCR)
+:::
+
+You ran ocrmypdf on a file that already contains printable text or a
+hidden OCR text layer (it can\'t quite tell the difference). You
+probably don\'t want to do this, because the file is already searchable.
+
+As the error message suggests, your options are:
+
+-   `ocrmypdf --force-ocr` to
+    `rasterize <raster-vector>`{.interpreted-text role="ref"} all vector
+    content and run OCR on the images. This is useful if a previous OCR
+    program failed, or if the document contains a text watermark.
+-   `ocrmypdf --skip-text` to skip OCR and other processing on any pages
+    that contain text. Text pages will be copied into the output PDF
+    without modification.
+-   `ocrmypdf --redo-ocr` to scan the file for any existing OCR
+    (non-printing text), remove it, and do OCR again. This is one way to
+    take advantage of improvements in OCR accuracy. Printable vector
+    text is excluded from OCR, so this can be used on files that contain
+    a mix of digital and scanned files.
+
+## Input file \'filename\' is not a valid PDF
+
+OCRmyPDF checks files with pikepdf, a library that in turn uses libqpdf
+to fixes errors in PDFs, before it tries to work on them. In most cases
+this happens because the PDF is corrupt and truncated (incomplete file
+copying) and not much can be done.
+
+You can try rewriting the file with Ghostscript:
+
+:::{code} bash
+gs -o output.pdf -dSAFER -sDEVICE=pdfwrite input.pdf
+:::
+
+`pdftk` can also rewrite PDFs:
+
+:::{code} bash
+pdftk input.pdf cat output output.pdf
+:::
+
+Sometimes Acrobat can repair PDFs with its [Preflight
+tool](https://helpx.adobe.com/acrobat/using/correcting-problem-areas-preflight-tool.html).

docs/errors.rst

@@ -1,57 +0,0 @@
-.. SPDX-FileCopyrightText: 2022 James R. Barlow
-..
-.. SPDX-License-Identifier: CC-BY-SA-4.0
-
-=====================
-Common error messages
-=====================
-
-Page already has text
-=====================
-
-.. code-block::
-
-   ERROR -    1: page already has text! – aborting (use --force-ocr to force OCR)
-
-You ran ocrmypdf on a file that already contains printable text or a
-hidden OCR text layer (it can't quite tell the difference). You probably
-don't want to do this, because the file is already searchable.
-
-As the error message suggests, your options are:
-
--  ``ocrmypdf --force-ocr`` to :ref:`rasterize <raster-vector>` all
-   vector content and run OCR on the images. This is useful if a
-   previous OCR program failed, or if the document contains a text
-   watermark.
--  ``ocrmypdf --skip-text`` to skip OCR and other processing on any
-   pages that contain text. Text pages will be copied into the output
-   PDF without modification.
--  ``ocrmypdf --redo-ocr`` to scan the file for any existing OCR
-   (non-printing text), remove it, and do OCR again. This is one way
-   to take advantage of improvements in OCR accuracy. Printable vector
-   text is excluded from OCR, so this can be used on files that contain
-   a mix of digital and scanned files.
-
-
-Input file 'filename' is not a valid PDF
-========================================
-
-OCRmyPDF checks files with pikepdf, a library that in turn uses libqpdf to fixes
-errors in PDFs, before it tries to work on them. In most cases this happens
-because the PDF is corrupt and truncated (incomplete file copying) and not much
-can be done.
-
-You can try rewriting the file with Ghostscript:
-
-.. code-block:: bash
-
-    gs -o output.pdf -dSAFER -sDEVICE=pdfwrite input.pdf
-
-``pdftk`` can also rewrite PDFs:
-
-.. code-block:: bash
-
-    pdftk input.pdf cat output output.pdf
-
-Sometimes Acrobat can repair PDFs with its `Preflight
-tool <https://helpx.adobe.com/acrobat/using/correcting-problem-areas-preflight-tool.html>`__.

docs/index.md

@@ -0,0 +1,57 @@
+% SPDX-FileCopyrightText: 2022 James R. Barlow
+% SPDX-License-Identifier: CC-BY-SA-4.0
+
+# OCRmyPDF documentation
+
+:::{figure} images/logo.svg
+:::
+
+OCRmyPDF adds an optical character recognition (OCR) text layer to scanned PDF
+files, allowing them to be searched.
+
+PDF is the best format for storing and exchanging scanned documents.
+Unfortunately, PDFs can be difficult to modify. OCRmyPDF makes it easy to apply
+image processing and OCR (recognized, searchable text) to existing PDFs.
+
+```{toctree}
+:maxdepth: 1
+
+introduction
+release_notes
+installation
+languages
+jbig2
+```
+
+```{toctree}
+:caption: Usage
+:maxdepth: 2
+
+cookbook
+optimizer
+docker
+advanced
+batch
+cloud
+performance
+pdfsecurity
+errors
+```
+
+```{toctree}
+:caption: Developers
+:maxdepth: 2
+
+api
+plugins
+apiref
+design_notes
+contributing
+maintainers
+```
+
+# Indices and tables
+
+- {ref}`genindex`
+- {ref}`modindex`
+- {ref}`search`

docs/index.rst

@@ -1,56 +0,0 @@
-.. SPDX-FileCopyrightText: 2022 James R. Barlow
-..
-.. SPDX-License-Identifier: CC-BY-SA-4.0
-
-OCRmyPDF documentation
-======================
-
-.. figure:: images/logo.svg
-
-OCRmyPDF adds an optical character recognition (OCR) text layer to scanned PDF
-files, allowing them to be searched.
-
-PDF is the best format for storing and exchanging scanned documents.
-Unfortunately, PDFs can be difficult to modify. OCRmyPDF makes it easy to apply
-image processing and OCR (recognized, searchable text) to existing PDFs.
-
-.. toctree::
-   :maxdepth: 1
-
-   introduction
-   release_notes
-   installation
-   languages
-   jbig2
-
-.. toctree::
-   :caption: Usage
-   :maxdepth: 2
-
-   cookbook
-   optimizer
-   docker
-   advanced
-   batch
-   cloud
-   performance
-   pdfsecurity
-   errors
-
-.. toctree::
-   :caption: Developers
-   :maxdepth: 2
-
-   api
-   plugins
-   apiref
-   design_notes
-   contributing
-   maintainers
-
-Indices and tables
-==================
-
-* :ref:`genindex`
-* :ref:`modindex`
-* :ref:`search`

docs/installation.md

@@ -0,0 +1,730 @@
+---
+myst:
+  substitutions:
+    deb_11: |-
+      :::{image} https://repology.org/badge/version-for-repo/debian_11/ocrmypdf.svg
+      :alt: Debian 11
+      :::
+    deb_12: |-
+      :::{image} https://repology.org/badge/version-for-repo/debian_12/ocrmypdf.svg
+      :alt: Debian 12
+      :::
+    deb_unstable: |-
+      :::{image} https://repology.org/badge/version-for-repo/debian_unstable/ocrmypdf.svg
+      :alt: Debian unstable
+      :::
+    fedora_38: |-
+      :::{image} https://repology.org/badge/version-for-repo/fedora_38/ocrmypdf.svg
+      :alt: Fedora 38
+      :::
+    fedora_39: |-
+      :::{image} https://repology.org/badge/version-for-repo/fedora_39/ocrmypdf.svg
+      :alt: Fedora 39
+      :::
+    fedora_rawhide: |-
+      :::{image} https://repology.org/badge/version-for-repo/fedora_rawhide/ocrmypdf.svg
+      :alt: Fedore Rawhide
+      :::
+    latest: |-
+      :::{image} https://img.shields.io/pypi/v/ocrmypdf.svg
+      :alt: OCRmyPDF latest released version on PyPI
+      :::
+    ubu_2004: |-
+      :::{image} https://repology.org/badge/version-for-repo/ubuntu_20_04/ocrmypdf.svg
+      :alt: Ubuntu 20.04 LTS
+      :::
+    ubu_2204: |-
+      :::{image} https://repology.org/badge/version-for-repo/ubuntu_22_04/ocrmypdf.svg
+      :alt: Ubuntu 22.04 LTS
+      :::
+---
+
+% SPDX-FileCopyrightText: 2022 James R. Barlow
+% SPDX-License-Identifier: CC-BY-SA-4.0
+
+# Installing OCRmyPDF
+
+(latest)=
+
+The easiest way to install OCRmyPDF is to follow the steps for your operating
+system/platform. This version may be out of date, however.
+
+These platforms have one-liner installs:
+
+:::{list-table}
+:header-rows: 0
+
+* - Debian, Ubuntu
+  - ``apt install ocrmypdf``
+* - Windows Subsystem for Linux
+  - ``apt install ocrmypdf``
+* - Fedora
+  - ``dnf install ocrmypdf tesseract-osd``
+* - macOS (Homebrew)
+  - ``brew install ocrmypdf``
+* - macOS (MacPorts)
+  - ``port install ocrmypdf``
+* - LinuxBrew
+  - ``brew install ocrmypdf``
+* - FreeBSD
+  - ``pkg install textproc/py-ocrmypdf``
+* - Snap (snapcraft packaging)
+  - ``snap install ocrmypdf``
+:::
+
+More detailed procedures are outlined below. If you want to do a manual
+install, or install a more recent version than your platform provides, read on.
+
+:::{contents} Platform-specific steps
+:depth: 2
+:local: true
+:::
+
+## Installing on Linux
+
+### Debian and Ubuntu 20.04 or newer
+
+:::{list-table}
+:header-rows: 1
+
+* - OCRmyPDF versions in Debian & Ubuntu
+* - {{ latest }}
+* - {{ deb_11 }} {{ deb_12 }} {{ deb_unstable }}
+* - {{ ubu_2004 }} {{ ubu_2204 }}
+:::
+
+Users of Debian or Ubuntu may simply
+
+```bash
+apt install ocrmypdf
+```
+
+As indicated in the table above, Debian and Ubuntu releases may lag
+behind the latest version. If the version available for your platform is
+out of date, you could opt to install the latest version from source.
+See [Installing HEAD revision from
+sources](#installing-head-revision-from-sources).
+
+For full details on version availability for your platform, check the
+[Debian Package Tracker](https://tracker.debian.org/pkg/ocrmypdf) or
+[Ubuntu launchpad.net](https://launchpad.net/ocrmypdf).
+
+:::{note}
+OCRmyPDF for Debian and Ubuntu currently omit the JBIG2 encoder.
+OCRmyPDF works fine without it but will produce larger output files.
+If you build jbig2enc from source, ocrmypdf will
+automatically detect it (specifically the `jbig2` binary) on the
+`PATH`. To add JBIG2 encoding, see {ref}`jbig2`.
+:::
+
+### Fedora
+
+:::{list-table}
+:header-rows: 1
+
+* - OCRmyPDF version
+* - {{latest}}
+* - {{fedora_38}} {{fedora_39}} {{fedora_rawhide}}
+:::
+
+Users of Fedora may simply
+
+```bash
+dnf install ocrmypdf tesseract-osd
+```
+
+For full details on version availability, check the [Fedora Package
+Tracker](https://packages.fedoraproject.org/pkgs/ocrmypdf/ocrmypdf/).
+
+If the version available for your platform is out of date, you could opt
+to install the latest version from source. See [Installing HEAD revision
+from sources](#installing-head-revision-from-sources).
+
+:::{note}
+OCRmyPDF for Fedora currently omits the JBIG2 encoder due to patent
+issues. OCRmyPDF works fine without it but will produce larger output
+files. If you build jbig2enc from source, ocrmypdf 7.0.0 and later
+will automatically detect it on the `PATH`. To add JBIG2 encoding,
+see {ref}`Installing the JBIG2 encoder <jbig2>`.
+:::
+
+(ubuntu-lts-latest)=
+
+### RHEL 9
+
+Prepare the environment by getting Python 3.11:
+
+```bash
+dnf install python3.11 python3.11-pip
+```
+
+Then, follow [Requirements for pip and HEAD install](#requirements-for-pip-and-head-install) to install dependencies:
+
+```bash
+dnf install ghostscript tesseract
+```
+
+and build ocrmypdf in virtual environment:
+
+```bash
+python3.11 -m venv .venv
+```
+
+To add JBIG2 encoding, see {ref}`Installing the JBIG2 encoder <jbig2>`.
+
+Note Fedora packages for language data haven't been branched for RHEL/EPEL, but you can get traineddata files directly from [tesseract](https://github.com/tesseract-ocr/tessdata/) and place them in `/usr/share/tesseract/tessdata`.
+
+### Installing the latest version on Ubuntu 22.04 LTS
+
+Ubuntu 22.04 includes ocrmypdf 13.4.0 - you can install that with
+`apt install ocrmypdf`. To install a more recent version for the current
+user, follow these steps:
+
+```bash
+sudo apt-get update
+sudo apt-get -y install ocrmypdf python3-pip
+
+pip install --user --upgrade ocrmypdf
+```
+
+If you get the message `WARNING: The script ocrmypdf is installed in
+'/home/$USER/.local/bin' which is not on PATH.`, you may need to re-login
+or open a new shell, or manually adjust your PATH.
+
+To add JBIG2 encoding, see {ref}`jbig2`.
+
+### Ubuntu 20.04 LTS
+
+Ubuntu 20.04 includes ocrmypdf 9.6.0 - you can install that with `apt`. The
+most convenient way to install recent OCRmyPDF on older Ubuntu is to use
+Homebrew on Linux (Linuxbrew).
+
+```bash
+brew install ocrmypdf
+```
+
+### Arch Linux (AUR)
+
+:::{image} https://repology.org/badge/version-for-repo/aur/ocrmypdf.svg
+:alt: ArchLinux
+:target: https://repology.org/metapackage/ocrmypdf
+:::
+
+There is an [Arch User Repository (AUR) package for OCRmyPDF](https://aur.archlinux.org/packages/ocrmypdf/).
+
+Installing AUR packages as root is not allowed, so you must first [setup a
+non-root user](https://wiki.archlinux.org/index.php/Users_and_groups#User_management) and
+[configure sudo](https://wiki.archlinux.org/index.php/Sudo#Configuration).
+The standard Docker image, `archlinux/base:latest`, does **not** have a
+non-root user configured, so users of that image must follow these guides. If
+you are using a VM image, such as [the official Vagrant image](https://app.vagrantup.com/archlinux/boxes/archlinux), this work may already
+be completed for you.
+
+Next you should install the [base-devel package group](https://archlinux.org/packages/core/any/base-devel/). This includes the
+standard tooling needed to build packages, such as a compiler and binary tools.
+
+```bash
+sudo pacman -S --needed base-devel
+```
+
+Now you are ready to install the OCRmyPDF package.
+
+```bash
+curl -O https://aur.archlinux.org/cgit/aur.git/snapshot/ocrmypdf.tar.gz
+tar xvzf ocrmypdf.tar.gz
+cd ocrmypdf
+makepkg -sri
+```
+
+At this point you will have a working install of OCRmyPDF, but the Tesseract
+install won’t include any OCR language data. You can install [the
+tesseract-data package group](https://www.archlinux.org/groups/any/tesseract-data/) to add all supported
+languages, or use that package listing to identify the appropriate package for
+your desired language.
+
+```bash
+sudo pacman -S tesseract-data-eng
+```
+
+As an alternative to this manual procedure, consider using an [AUR helper](https://wiki.archlinux.org/index.php/AUR_helpers). Such a tool will
+automatically fetch, build and install the AUR package, resolve dependencies
+(including dependencies on AUR packages), and ease the upgrade procedure.
+
+If you have any difficulties with installation, check the repository package
+page.
+
+:::{note}
+The OCRmyPDF AUR package currently omits the JBIG2 encoder. OCRmyPDF works
+fine without it but will produce larger output files. The encoder is
+available from [the jbig2enc-git AUR package](https://aur.archlinux.org/packages/jbig2enc-git/) and may be installed
+using the same series of steps as for the installation OCRmyPDF AUR
+package. Alternatively, it may be built manually from source following the
+instructions in {ref}`Installing the JBIG2 encoder <jbig2>`. If JBIG2 is
+installed, OCRmyPDF 7.0.0 and later will automatically detect it.
+:::
+
+### Alpine Linux
+
+:::{image} https://repology.org/badge/version-for-repo/alpine_edge/ocrmypdf.svg
+:alt: Alpine Linux
+:target: https://repology.org/metapackage/ocrmypdf
+:::
+
+To install OCRmyPDF for Alpine Linux:
+
+```bash
+apk add ocrmypdf
+```
+
+### Gentoo Linux
+
+:::{image} https://repology.org/badge/version-for-repo/gentoo_ovl_guru/ocrmypdf.svg
+:alt: Gentoo Linux
+:target: https://repology.org/metapackage/ocrmypdf
+:::
+
+To install OCRmyPDF on Gentoo Linux, use the following commands:
+
+```bash
+eselect repository enable guru
+emaint sync --repo guru
+emerge --ask app-text/OCRmyPDF
+```
+
+### Other Linux packages
+
+See the
+[Repology](https://repology.org/metapackage/ocrmypdf/versions) page.
+
+In general, first install the OCRmyPDF package for your system, then
+optionally use the procedure [Installing with Python
+pip](#installing-with-python-pip) to install a more recent version.
+
+## Installing on macOS
+
+### Homebrew
+
+:::{image} https://img.shields.io/homebrew/v/ocrmypdf.svg
+:alt: homebrew
+:target: https://formulae.brew.sh/formula/ocrmypdf
+:::
+
+OCRmyPDF is now a standard [Homebrew](https://brew.sh) formula. To
+install on macOS:
+
+```bash
+brew install ocrmypdf
+```
+
+This will include only the English language pack. If you need other
+languages you can optionally install them all:
+
+```bash
+brew install tesseract-lang  # Optional: Install all language packs
+```
+
+### MacPorts
+
+:::{image} https://img.shields.io/badge/dynamic/json?url=https%3A%2F%2Fports.macports.org%2Fapi%2Fv1%2Fports%2Focrmypdf%2F%3Fformat%3Djson&query=version&label=MacPorts
+:alt: Macports Version Information
+:target: https://ports.macports.org/port/ocrmypdf
+:::
+
+OCRmyPDF is includes in MacPorts:
+
+```bash
+sudo port install ocrmypdf
+```
+
+Note that while this will install tesseract you will need to install
+the appropriate tesseract [language ports](https://ports.macports.org/search/?selected_facets=categories_exact%3Atextproc&installed_file=&q=tesseract&name=on).
+
+### Manual installation on macOS
+
+These instructions probably work on all macOS supported by Homebrew, and are
+for installing a more current version of OCRmyPDF than is available from
+Homebrew. Note that the Homebrew versions usually track the release versions
+fairly closely.
+
+If it's not already present, [install Homebrew](http://brew.sh/).
+
+Update Homebrew:
+
+```bash
+brew update
+```
+
+Install or upgrade the required Homebrew packages, if any are missing.
+To do this, use `brew edit ocrmypdf` to obtain a recent list of Homebrew
+dependencies. You could also check the `.workflows/build.yml`.
+
+This will include the English, French, German and Spanish language
+packs. If you need other languages you can optionally install them all:
+
+(macos-all-languages)=
+
+> ```bash
+> brew install tesseract-lang  # Option 2: for all language packs
+> ```
+
+Update the homebrew pip:
+
+```bash
+pip install --upgrade pip
+```
+
+You can then install OCRmyPDF from PyPI for the current user:
+
+```bash
+pip install --user ocrmypdf
+```
+
+The command line program should now be available:
+
+```bash
+ocrmypdf --help
+```
+
+## Installing on Windows
+
+### Native Windows
+
+% If you have a Windows that is not the Home edition, you can use Windows Sandbox to test on a blank Windows instance.
+% https://learn.microsoft.com/en-us/windows/security/application-security/application-isolation/windows-sandbox/
+
+:::{note}
+Administrator privileges will be required for some of these steps.
+:::
+
+You must install the following for Windows:
+
+- Python 64-bit
+- Tesseract 64-bit
+- Ghostscript 64-bit
+
+Using the [winget](https://docs.microsoft.com/en-us/windows/package-manager/winget/)
+package manager:
+
+- `winget install -e --id Python.Python.3.11`
+- `winget install -e --id UB-Mannheim.TesseractOCR`
+
+You will need to install Ghostscript manually, [since it does not support automated
+installs anymore](https://artifex.com/news/ghostscript-10.01.0-disabling-silent-install-option).
+
+- [Ghostscript download page](https://ghostscript.com/releases/gsdnld.html).\`
+
+(Or alternately, using the [Chocolatey](https://chocolatey.org/) package manager, install
+the following when running in an Administrator command prompt):
+
+- `choco install python3`
+- `choco install --pre tesseract`
+- `choco install pngquant` (optional)
+
+Either set of commands will install the required software. At the moment there is no
+single command to install Windows.
+
+You may then use `pip` to install ocrmypdf. (This can performed by a user or
+Administrator.):
+
+- `python3 -m pip install ocrmypdf`
+
+% The Windows Python versions do not place any python or python3 executable in the path.
+% They add the py launcher to the path:
+% https://docs.python.org/3/using/windows.html#python-launcher-for-windows
+
+If you installed Python using WinGet, then use the following command instead:
+
+- `py -m pip install ocrmypdf`
+
+and use:
+
+- `py -m ocrmypdf`
+
+To start OCRmyPDF.
+
+If you intend to use more Python software on your Windows machine, consider the use of
+[pipx](https://pipx.pypa.io/stable/) or a similar tool to create isolated Python
+environments for each Python software that you want to use.
+
+OCRmyPDF will check the Windows Registry and standard locations in your Program Files
+for third party software it needs (specifically, Tesseract and Ghostscript). To
+override the versions OCRmyPDF selects, you can modify the `PATH` environment
+variable. [Follow these directions](https://www.computerhope.com/issues/ch000549.htm#dospath)
+to change the PATH.
+
+:::{warning}
+As of early 2021, users have reported problems with the Microsoft Store version of
+Python and OCRmyPDF. These issues affect many other third party Python packages.
+Please download Python from Python.org or a package manager instead of the
+Microsoft Store version.
+:::
+
+:::{warning}
+32-bit Windows is not supported.
+:::
+
+### Windows Subsystem for Linux
+
+1. Install Ubuntu 22.04 for Windows Subsystem for Linux, if not already installed.
+2. Follow the procedure to install {ref}`OCRmyPDF on Ubuntu 22.04 <ubuntu-lts-latest>`.
+3. Open the Windows command prompt and create a symlink:
+
+```powershell
+wsl sudo ln -s  /home/$USER/.local/bin/ocrmypdf /usr/local/bin/ocrmypdf
+```
+
+Then confirm that the expected version from PyPI ({{ latest }}) is installed:
+
+```powershell
+wsl ocrmypdf --version
+```
+
+You can then run OCRmyPDF in the Windows command prompt or Powershell, prefixing
+`wsl`, and call it from Windows programs or batch files.
+
+### Cygwin64
+
+First install the the following prerequisite Cygwin packages using `setup-x86_64.exe`:
+
+```
+python310 (or later)
+python3?-devel
+python3?-pip
+python3?-lxml
+python3?-imaging
+
+   (where 3? means match the version of python3 you installed)
+
+gcc-g++
+ghostscript
+libexempi3
+libexempi-devel
+libffi6
+libffi-devel
+pngquant
+qpdf
+libqpdf-devel
+tesseract-ocr
+tesseract-ocr-devel
+```
+
+Then open a Cygwin terminal (i.e. `mintty`), run the following commands. Note
+that if you are using the version of `pip` that was installed with the Cygwin
+Python package, the command name will be `pip3`. If you have since updated
+`pip` (with, for instance `pip3 install --upgrade pip`) the the command is
+likely just `pip` instead of `pip3`:
+
+```bash
+pip3 install wheel
+pip3 install ocrmypdf
+```
+
+The optional dependency "unpaper" that is currently not available under Cygwin.
+Without it, certain options such as `--clean` will produce an error message.
+However, the OCR-to-text-layer functionality is available.
+
+### Docker
+
+You can also [Install the Docker image](docker) on Windows. Ensure that
+your command prompt can run the docker "hello world" container.
+
+## Installing on FreeBSD
+
+:::{image} https://repology.org/badge/version-for-repo/freebsd/ocrmypdf.svg
+:alt: FreeBSD
+:target: https://repology.org/project/ocrmypdf/versions
+:::
+
+```bash
+pkg install textproc/py-ocrmypdf
+```
+
+To install a more recent version, you could attempt to first install the system
+version with `pkg`, then use `pip install --user ocrmypdf`.
+
+## Installing the Docker image
+
+For some users, installing the Docker image will be easier than
+installing all of OCRmyPDF's dependencies.
+
+See [Installing the Docker image](docker) for more information.
+
+(installing-with-python-pip)=
+
+## Installing with Python pip
+
+OCRmyPDF is delivered by PyPI because it is a convenient way to install
+the latest version. However, PyPI and `pip` cannot address the fact
+that `ocrmypdf` depends on certain non-Python system libraries and
+programs being installed.
+
+For best results, first install [your platform's
+version](https://repology.org/metapackage/ocrmypdf/versions) of
+`ocrmypdf`, using the instructions elsewhere in this document. Then
+you can use `pip` to get the latest version if your platform version
+is out of date. Chances are that this will satisfy most dependencies.
+
+Use `ocrmypdf --version` to confirm what version was installed.
+
+Then you can install the latest OCRmyPDF from the Python wheels. First
+try:
+
+```bash
+pip install --user ocrmypdf
+```
+
+(If the message appears `Requirement already satisfied: ocrmypdf in...`,
+you will need to use `pip install --user --upgrade ocrmypdf`.)
+
+You should then be able to run `ocrmypdf --version` and see that the
+latest version was located.
+
+## Installing with pipx
+
+Some users may prefer pipx. As with the method above, you will need to
+satisfy all non-Python dependencies. Then if pipx is installed, you
+can use
+
+```bash
+pipx run ocrmypdf
+```
+
+(If not installed, pipx will install first.)
+
+(requirements-for-pip-and-head-install)=
+
+### Requirements for pip and HEAD install
+
+OCRmyPDF currently requires these external programs and libraries to be
+installed, and must be satisfied using the operating system package
+manager. `pip` cannot provide them.
+
+The following versions are required:
+
+- Python 3.10 or newer
+- Ghostscript 9.54 or newer
+- Tesseract 4.1.1 or newer
+- jbig2enc 0.29 or newer
+- pngquant 2.5 or newer
+- unpaper 6.1
+
+We recommend 64-bit versions of all software. (32-bit versions are not
+supported, although on Linux, they may still work.)
+
+jbig2enc, pngquant, and unpaper are optional. If missing certain
+features are disabled. OCRmyPDF will discover them as soon as they are
+available.
+
+**jbig2enc**, if present, will be used to optimize the encoding of
+monochrome images. This can significantly reduce the file size of the
+output file. It is not required.
+[jbig2enc](https://github.com/agl/jbig2enc) is not generally
+available for Ubuntu or Debian due to lingering concerns about patent
+issues, but can easily be built from source. To add JBIG2 encoding, see
+{ref}`jbig2`.
+
+**pngquant**, if present, is optionally used to optimize the encoding of
+PNG-style images in PDFs (actually, any that are that losslessly
+encoded) by lossily quantizing to a smaller color palette. It is only
+activated then the `--optimize` argument is `2` or `3`.
+
+**unpaper**, if present, enables the `--clean` and `--clean-final`
+command line options.
+
+These are in addition to the Python packaging dependencies, meaning that
+unfortunately, the `pip install` command cannot satisfy all of them.
+
+(installing-head-revision-from-sources)=
+
+## Installing HEAD revision from sources
+
+If you have `git` and Python 3.10 or newer installed, you can install
+from source. When the `pip` installer runs, it will alert you if
+dependencies are missing.
+
+If you prefer to build every from source, you will need to [build
+pikepdf from
+source](https://pikepdf.readthedocs.io/en/latest/installation.html#building-from-source).
+First ensure you can build and install pikepdf.
+
+To install the HEAD revision from sources in the current Python 3
+environment:
+
+```bash
+pip install git+https://github.com/ocrmypdf/OCRmyPDF.git
+```
+
+Or, to install in editable mode
+allowing customization of OCRmyPDF, use the `-e` flag:
+
+```bash
+pip install -e git+https://github.com/ocrmypdf/OCRmyPDF.git
+```
+
+You may find it easiest to install in a virtual environment, rather than
+system-wide:
+
+```bash
+git clone -b main https://github.com/ocrmypdf/OCRmyPDF.git
+python3 -m venv .venv
+source .venv/bin/activate
+cd OCRmyPDF
+pip install .
+```
+
+However, `ocrmypdf` will only be accessible on the system PATH when
+you activate the virtual environment.
+
+To run the program:
+
+```bash
+ocrmypdf --help
+```
+
+If not yet installed, the script will notify you about dependencies that
+need to be installed. The script requires specific versions of the
+dependencies. Older version than the ones mentioned in the release notes
+are likely not to be compatible to OCRmyPDF.
+
+### For development
+
+To install all of the development and test requirements:
+
+```bash
+git clone -b main https://github.com/ocrmypdf/OCRmyPDF.git
+python -m venv .venv
+source .venv/bin/activate
+cd OCRmyPDF
+pip install -e .[test]
+```
+
+To add JBIG2 encoding, see {ref}`jbig2`.
+
+## Shell completions
+
+Completions for `bash` and `fish` are available in the project's
+`misc/completion` folder. The `bash` completions are likely `zsh`
+compatible but this has not been confirmed. Package maintainers, please
+install these at the appropriate locations for your system.
+
+To manually install the `bash` completion, copy
+`misc/completion/ocrmypdf.bash` to `/etc/bash_completion.d/ocrmypdf`
+(rename the file).
+
+To manually install the `fish` completion, copy
+`misc/completion/ocrmypdf.fish` to
+`~/.config/fish/completions/ocrmypdf.fish`.
+
+## Note on 32-bit support
+
+Many Python libraries no longer provide 32-bit binary wheels for Linux. This
+includes many of the libraries that OCRmyPDF depends on, such as
+Pillow. The easiest way to express this to end users is to say we don't
+support 32-bit Linux.
+
+However, if your Linux distribution still supports 32-bit binaries, you
+can still install and use OCRmyPDF. A warning message will appear.
+In practice, OCRmyPDF may need more than 32-bit memory space to run when
+large documents are processed, so there are practical limitations to what
+users can accomplish with it. Still, for the common use case of an 32-bit
+ARM NAS or Raspberry Pi processing small documents, it should work.

docs/installation.rst

@@ -1,719 +0,0 @@
-.. SPDX-FileCopyrightText: 2022 James R. Barlow
-..
-.. SPDX-License-Identifier: CC-BY-SA-4.0
-
-===================
-Installing OCRmyPDF
-===================
-
-.. |latest| image:: https://img.shields.io/pypi/v/ocrmypdf.svg
-    :alt: OCRmyPDF latest released version on PyPI
-
-|latest|
-
-The easiest way to install OCRmyPDF is to follow the steps for your operating
-system/platform. This version may be out of date, however.
-
-These platforms have one-liner installs:
-
-+-------------------------------+-----------------------------------------+
-| Debian, Ubuntu                | ``apt install ocrmypdf``                |
-+-------------------------------+-----------------------------------------+
-| Windows Subsystem for Linux   | ``apt install ocrmypdf``                |
-+-------------------------------+-----------------------------------------+
-| Fedora                        | ``dnf install ocrmypdf tesseract-osd``  |
-+-------------------------------+-----------------------------------------+
-| macOS (Homebrew)              | ``brew install ocrmypdf``               |
-+-------------------------------+-----------------------------------------+
-| macOS (MacPorts)              | ``port install ocrmypdf``               |
-+-------------------------------+-----------------------------------------+
-| LinuxBrew                     | ``brew install ocrmypdf``               |
-+-------------------------------+-----------------------------------------+
-| FreeBSD                       | ``pkg install textproc/py-ocrmypdf``    |
-+-------------------------------+-----------------------------------------+
-| Conda (WSL, macOS, Linux)     | ``conda install ocrmypdf``              |
-+-------------------------------+-----------------------------------------+
-| Snap (snapcraft packaging)    | ``snap install ocrmypdf``               |
-+-------------------------------+-----------------------------------------+
-
-More detailed procedures are outlined below. If you want to do a manual
-install, or install a more recent version than your platform provides, read on.
-
-.. contents:: Platform-specific steps
-    :depth: 2
-    :local:
-
-Installing on Linux
-===================
-
-Debian and Ubuntu 20.04 or newer
---------------------------------
-
-.. |deb-11| image:: https://repology.org/badge/version-for-repo/debian_11/ocrmypdf.svg
-    :alt: Debian 11
-
-.. |deb-12| image:: https://repology.org/badge/version-for-repo/debian_12/ocrmypdf.svg
-    :alt: Debian 12
-
-.. |deb-unstable| image:: https://repology.org/badge/version-for-repo/debian_unstable/ocrmypdf.svg
-    :alt: Debian unstable
-
-.. |ubu-2004| image:: https://repology.org/badge/version-for-repo/ubuntu_20_04/ocrmypdf.svg
-    :alt: Ubuntu 20.04 LTS
-
-.. |ubu-2204| image:: https://repology.org/badge/version-for-repo/ubuntu_22_04/ocrmypdf.svg
-    :alt: Ubuntu 22.04 LTS
-
-+-----------------------------------------------+
-| **OCRmyPDF versions in Debian & Ubuntu**      |
-+-----------------------------------------------+
-| |latest|                                      |
-+-----------------------------------------------+
-| |deb-11| |deb-12| |deb-unstable|              |
-+-----------------------------------------------+
-| |ubu-2004| |ubu-2204|                         |
-+-----------------------------------------------+
-
-Users of Debian or Ubuntu may simply
-
-.. code-block:: bash
-
-    apt install ocrmypdf
-
-As indicated in the table above, Debian and Ubuntu releases may lag
-behind the latest version. If the version available for your platform is
-out of date, you could opt to install the latest version from source.
-See `Installing HEAD revision from
-sources <#installing-head-revision-from-sources>`__.
-
-For full details on version availability for your platform, check the
-`Debian Package Tracker <https://tracker.debian.org/pkg/ocrmypdf>`__ or
-`Ubuntu launchpad.net <https://launchpad.net/ocrmypdf>`__.
-
-.. note::
-
-   OCRmyPDF for Debian and Ubuntu currently omit the JBIG2 encoder.
-   OCRmyPDF works fine without it but will produce larger output files.
-   If you build jbig2enc from source, ocrmypdf will
-   automatically detect it (specifically the ``jbig2`` binary) on the
-   ``PATH``. To add JBIG2 encoding, see :ref:`jbig2`.
-
-Fedora
-------
-
-.. |fedora-38| image:: https://repology.org/badge/version-for-repo/fedora_38/ocrmypdf.svg
-    :alt: Fedora 38
-
-.. |fedora-39| image:: https://repology.org/badge/version-for-repo/fedora_39/ocrmypdf.svg
-    :alt: Fedora 39
-
-.. |fedora-rawhide| image:: https://repology.org/badge/version-for-repo/fedora_rawhide/ocrmypdf.svg
-    :alt: Fedore Rawhide
-
-+-----------------------------------------------+
-| **OCRmyPDF version**                          |
-+-----------------------------------------------+
-| |latest|                                      |
-+-----------------------------------------------+
-| |fedora-38| |fedora-39| |fedora-rawhide|      |
-+-----------------------------------------------+
-
-Users of Fedora may simply
-
-.. code-block:: bash
-
-    dnf install ocrmypdf tesseract-osd
-
-For full details on version availability, check the `Fedora Package
-Tracker <https://packages.fedoraproject.org/pkgs/ocrmypdf/ocrmypdf/>`__.
-
-If the version available for your platform is out of date, you could opt
-to install the latest version from source. See `Installing HEAD revision
-from sources <#installing-head-revision-from-sources>`__.
-
-.. note::
-
-   OCRmyPDF for Fedora currently omits the JBIG2 encoder due to patent
-   issues. OCRmyPDF works fine without it but will produce larger output
-   files. If you build jbig2enc from source, ocrmypdf 7.0.0 and later
-   will automatically detect it on the ``PATH``. To add JBIG2 encoding,
-   see :ref:`Installing the JBIG2 encoder <jbig2>`.
-
-.. _ubuntu-lts-latest:
-
-RHEL 9
-------
-
-Prepare the environment by getting Python 3.11:
-
-.. code-block:: bash
-
-    dnf install python3.11 python3.11-pip
-
-Then, follow `Requirements for pip and HEAD install <#requirements-for-pip-and-head-install>`__ to instal dependencies:
-
-.. code-block:: bash
-
-    dnf install ghostscript tesseract
-
-and build ocrmypdf in virtual environment:
-
-.. code-block:: bash
-
-    python3.11 -m venv .venv
-
-To add JBIG2 encoding, see :ref:`Installing the JBIG2 encoder <jbig2>`.
-
-Note Fedora packages for language data haven't been branched for RHEL/EPEL, but you can get traineddata files directly from `tesseract
-<https://github.com/tesseract-ocr/tessdata/>`__ and place them in ``/usr/share/tesseract/tessdata``.
-
-Installing the latest version on Ubuntu 22.04 LTS
--------------------------------------------------
-
-Ubuntu 22.04 includes ocrmypdf 13.4.0 - you can install that with
-``apt install ocrmypdf``. To install a more recent version for the current
-user, follow these steps:
-
-.. code-block:: bash
-
-    sudo apt-get update
-    sudo apt-get -y install ocrmypdf python3-pip
-
-    pip install --user --upgrade ocrmypdf
-
-If you get the message ``WARNING: The script ocrmypdf is installed in
-'/home/$USER/.local/bin' which is not on PATH.``, you may need to re-login
-or open a new shell, or manually adjust your PATH.
-
-To add JBIG2 encoding, see :ref:`jbig2`.
-
-Ubuntu 20.04 LTS
-----------------
-
-Ubuntu 20.04 includes ocrmypdf 9.6.0 - you can install that with ``apt``. The
-most convenient way to install recent OCRmyPDF on older Ubuntu is to use
-Homebrew on Linux (Linuxbrew).
-
-.. code-block:: bash
-
-    brew install ocrmypdf
-
-Arch Linux (AUR)
-----------------
-
-.. image:: https://repology.org/badge/version-for-repo/aur/ocrmypdf.svg
-    :alt: ArchLinux
-    :target: https://repology.org/metapackage/ocrmypdf
-
-There is an `Arch User Repository (AUR) package for OCRmyPDF
-<https://aur.archlinux.org/packages/ocrmypdf/>`__.
-
-Installing AUR packages as root is not allowed, so you must first `setup a
-non-root user
-<https://wiki.archlinux.org/index.php/Users_and_groups#User_management>`__ and
-`configure sudo <https://wiki.archlinux.org/index.php/Sudo#Configuration>`__.
-The standard Docker image, ``archlinux/base:latest``, does **not** have a
-non-root user configured, so users of that image must follow these guides. If
-you are using a VM image, such as `the official Vagrant image
-<https://app.vagrantup.com/archlinux/boxes/archlinux>`__, this work may already
-be completed for you.
-
-Next you should install the `base-devel package group
-<https://archlinux.org/packages/core/any/base-devel/>`__. This includes the
-standard tooling needed to build packages, such as a compiler and binary tools.
-
-.. code-block:: bash
-
-   sudo pacman -S --needed base-devel
-
-Now you are ready to install the OCRmyPDF package.
-
-.. code-block:: bash
-
-   curl -O https://aur.archlinux.org/cgit/aur.git/snapshot/ocrmypdf.tar.gz
-   tar xvzf ocrmypdf.tar.gz
-   cd ocrmypdf
-   makepkg -sri
-
-At this point you will have a working install of OCRmyPDF, but the Tesseract
-install won’t include any OCR language data. You can install `the
-tesseract-data package group
-<https://www.archlinux.org/groups/any/tesseract-data/>`__ to add all supported
-languages, or use that package listing to identify the appropriate package for
-your desired language.
-
-.. code-block:: bash
-
-   sudo pacman -S tesseract-data-eng
-
-As an alternative to this manual procedure, consider using an `AUR helper
-<https://wiki.archlinux.org/index.php/AUR_helpers>`__. Such a tool will
-automatically fetch, build and install the AUR package, resolve dependencies
-(including dependencies on AUR packages), and ease the upgrade procedure.
-
-If you have any difficulties with installation, check the repository package
-page.
-
-.. note::
-
-    The OCRmyPDF AUR package currently omits the JBIG2 encoder. OCRmyPDF works
-    fine without it but will produce larger output files. The encoder is
-    available from `the jbig2enc-git AUR package
-    <https://aur.archlinux.org/packages/jbig2enc-git/>`__ and may be installed
-    using the same series of steps as for the installation OCRmyPDF AUR
-    package. Alternatively, it may be built manually from source following the
-    instructions in :ref:`Installing the JBIG2 encoder <jbig2>`.  If JBIG2 is
-    installed, OCRmyPDF 7.0.0 and later will automatically detect it.
-
-Alpine Linux
-------------
-
-.. image:: https://repology.org/badge/version-for-repo/alpine_edge/ocrmypdf.svg
-    :alt: Alpine Linux
-    :target: https://repology.org/metapackage/ocrmypdf
-
-To install OCRmyPDF for Alpine Linux:
-
-.. code-block:: bash
-
-    apk add ocrmypdf
-
-Gentoo Linux
-------------
-
-.. image:: https://repology.org/badge/version-for-repo/gentoo_ovl_guru/ocrmypdf.svg
-    :alt: Gentoo Linux
-    :target: https://repology.org/metapackage/ocrmypdf
-
-To install OCRmyPDF on Gentoo Linux, use the following commands:
-
-.. code-block:: bash
-
-    eselect repository enable guru
-    emaint sync --repo guru
-    emerge --ask app-text/OCRmyPDF
-
-Other Linux packages
---------------------
-
-See the
-`Repology <https://repology.org/metapackage/ocrmypdf/versions>`__ page.
-
-In general, first install the OCRmyPDF package for your system, then
-optionally use the procedure `Installing with Python
-pip <#installing-with-python-pip>`__ to install a more recent version.
-
-Installing on macOS
-===================
-
-Homebrew
---------
-
-.. image:: https://img.shields.io/homebrew/v/ocrmypdf.svg
-    :alt: homebrew
-    :target: https://formulae.brew.sh/formula/ocrmypdf
-
-OCRmyPDF is now a standard `Homebrew <https://brew.sh>`__ formula. To
-install on macOS:
-
-.. code-block:: bash
-
-    brew install ocrmypdf
-
-This will include only the English language pack. If you need other
-languages you can optionally install them all:
-
-.. code-block:: bash
-
-    brew install tesseract-lang  # Optional: Install all language packs
-
-MacPorts
---------
-
-.. image:: https://img.shields.io/badge/dynamic/json?url=https%3A%2F%2Fports.macports.org%2Fapi%2Fv1%2Fports%2Focrmypdf%2F%3Fformat%3Djson&query=version&label=MacPorts
-   :alt: Macports Version Information
-   :target: https://ports.macports.org/port/ocrmypdf
-
-OCRmyPDF is includes in MacPorts:
-
-.. code-block:: bash
-
-    sudo port install ocrmypdf
-
-Note that while this will install tesseract you will need to install
-the appropriate tesseract `language ports <https://ports.macports.org/search/?selected_facets=categories_exact%3Atextproc&installed_file=&q=tesseract&name=on>`__.
-
-Manual installation on macOS
-----------------------------
-
-These instructions probably work on all macOS supported by Homebrew, and are
-for installing a more current version of OCRmyPDF than is available from
-Homebrew. Note that the Homebrew versions usually track the release versions
-fairly closely.
-
-If it's not already present, `install Homebrew <http://brew.sh/>`__.
-
-Update Homebrew:
-
-.. code-block:: bash
-
-    brew update
-
-Install or upgrade the required Homebrew packages, if any are missing.
-To do this, use ``brew edit ocrmypdf`` to obtain a recent list of Homebrew
-dependencies. You could also check the ``.workflows/build.yml``.
-
-This will include the English, French, German and Spanish language
-packs. If you need other languages you can optionally install them all:
-
-.. _macos-all-languages:
-
-   .. code-block:: bash
-
-    brew install tesseract-lang  # Option 2: for all language packs
-
-Update the homebrew pip:
-
-.. code-block:: bash
-
-    pip install --upgrade pip
-
-You can then install OCRmyPDF from PyPI for the current user:
-
-.. code-block:: bash
-
-    pip install --user ocrmypdf
-
-The command line program should now be available:
-
-.. code-block:: bash
-
-    ocrmypdf --help
-
-Installing on Windows
-=====================
-
-Native Windows
---------------
-
-.. note::
-
-    Administrator privileges will be required for some of these steps.
-
-You must install the following for Windows:
-
-* Python 64-bit
-* Tesseract 64-bit
-* Ghostscript 64-bit
-
-Using the `winget <https://docs.microsoft.com/en-us/windows/package-manager/winget/>`_
-package manager:
-
-* ``winget install -e --id Python.Python.3.11``
-* ``winget install -e --id UB-Mannheim.TesseractOCR``
-
-You will need to install Ghostscript manually, `since it does not support automated
-installs anymore <https://artifex.com/news/ghostscript-10.01.0-disabling-silent-install-option>`_.
-
-* `Ghostscript download page <https://ghostscript.com/releases/gsdnld.html>`_.`
-
-(Or alternately, using the `Chocolatey <https://chocolatey.org/>`_ package manager, install
-the following when running in an Administrator command prompt):
-
-* ``choco install python3``
-* ``choco install --pre tesseract``
-* ``choco install pngquant`` (optional)
-
-Either set of commands will install the required software. At the moment there is no
-single command to install Windows.
-
-You may then use ``pip`` to install ocrmypdf. (This can performed by a user or
-Administrator.):
-
-* ``python3 -m pip install ocrmypdf``
-
-OCRmyPDF will check the Windows Registry and standard locations in your Program Files
-for third party software it needs (specifically, Tesseract and Ghostscript). To
-override the versions OCRmyPDF selects, you can modify the ``PATH`` environment
-variable. `Follow these directions <https://www.computerhope.com/issues/ch000549.htm#dospath>`_
-to change the PATH.
-
-.. warning::
-
-    As of early 2021, users have reported problems with the Microsoft Store version of
-    Python and OCRmyPDF. These issues affect many other third party Python packages.
-    Please download Python from Python.org or a package manager instead of the
-    Microsoft Store version.
-
-.. warning::
-
-    32-bit Windows is not supported.
-
-Windows Subsystem for Linux
----------------------------
-
-#. Install Ubuntu 22.04 for Windows Subsystem for Linux, if not already installed.
-#. Follow the procedure to install :ref:`OCRmyPDF on Ubuntu 22.04 <ubuntu-lts-latest>`.
-#. Open the Windows command prompt and create a symlink:
-
-.. code-block:: powershell
-
-    wsl sudo ln -s  /home/$USER/.local/bin/ocrmypdf /usr/local/bin/ocrmypdf
-
-Then confirm that the expected version from PyPI (|latest|) is installed:
-
-.. code-block:: powershell
-
-    wsl ocrmypdf --version
-
-You can then run OCRmyPDF in the Windows command prompt or Powershell, prefixing
-``wsl``, and call it from Windows programs or batch files.
-
-Cygwin64
---------
-
-First install the the following prerequisite Cygwin packages using ``setup-x86_64.exe``::
-
-    python310 (or later)
-    python3?-devel
-    python3?-pip
-    python3?-lxml
-    python3?-imaging
-
-       (where 3? means match the version of python3 you installed)
-
-    gcc-g++
-    ghostscript
-    libexempi3
-    libexempi-devel
-    libffi6
-    libffi-devel
-    pngquant
-    qpdf
-    libqpdf-devel
-    tesseract-ocr
-    tesseract-ocr-devel
-
-Then open a Cygwin terminal (i.e. ``mintty``), run the following commands. Note
-that if you are using the version of ``pip`` that was installed with the Cygwin
-Python package, the command name will be ``pip3``.  If you have since updated
-``pip`` (with, for instance ``pip3 install --upgrade pip``) the the command is
-likely just ``pip`` instead of ``pip3``:
-
-.. code-block:: bash
-
-    pip3 install wheel
-    pip3 install ocrmypdf
-
-The optional dependency "unpaper" that is currently not available under Cygwin.
-Without it, certain options such as ``--clean`` will produce an error message.
-However, the OCR-to-text-layer functionality is available.
-
-Docker
-------
-
-You can also :ref:`Install the Docker <docker>` container on Windows. Ensure that
-your command prompt can run the docker "hello world" container.
-
-Installing on FreeBSD
-=====================
-
-.. image:: https://repology.org/badge/version-for-repo/freebsd/ocrmypdf.svg
-    :alt: FreeBSD
-    :target: https://repology.org/project/ocrmypdf/versions
-
-.. code-block:: bash
-
-    pkg install textproc/py-ocrmypdf
-
-To install a more recent version, you could attempt to first install the system
-version with ``pkg``, then use ``pip install --user ocrmypdf``.
-
-Installing the Docker image
-===========================
-
-For some users, installing the Docker image will be easier than
-installing all of OCRmyPDF's dependencies.
-
-See :ref:`docker` for more information.
-
-Installing with Python pip
-==========================
-
-OCRmyPDF is delivered by PyPI because it is a convenient way to install
-the latest version. However, PyPI and ``pip`` cannot address the fact
-that ``ocrmypdf`` depends on certain non-Python system libraries and
-programs being installed.
-
-For best results, first install `your platform's
-version <https://repology.org/metapackage/ocrmypdf/versions>`__ of
-``ocrmypdf``, using the instructions elsewhere in this document. Then
-you can use ``pip`` to get the latest version if your platform version
-is out of date. Chances are that this will satisfy most dependencies.
-
-Use ``ocrmypdf --version`` to confirm what version was installed.
-
-Then you can install the latest OCRmyPDF from the Python wheels. First
-try:
-
-.. code-block:: bash
-
-    pip install --user ocrmypdf
-
-(If the message appears ``Requirement already satisfied: ocrmypdf in...``,
-you will need to use ``pip install --user --upgrade ocrmypdf``.)
-
-You should then be able to run ``ocrmypdf --version`` and see that the
-latest version was located.
-
-Installing with pipx
-====================
-
-Some users may prefer pipx. As with the method above, you will need to
-satisfy all non-Python dependencies. Then if pipx is installed, you
-can use
-
-.. code-block:: bash
-
-    pipx run ocrmypdf
-
-(If not installed, pipx will install first.)
-
-Requirements for pip and HEAD install
--------------------------------------
-
-OCRmyPDF currently requires these external programs and libraries to be
-installed, and must be satisfied using the operating system package
-manager. ``pip`` cannot provide them.
-
-The following versions are required:
-
--  Python 3.10 or newer
--  Ghostscript 9.54 or newer
--  Tesseract 4.1.1 or newer
--  jbig2enc 0.29 or newer
--  pngquant 2.5 or newer
--  unpaper 6.1
-
-We recommend 64-bit versions of all software. (32-bit versions are not
-supported, although on Linux, they may still work.)
-
-jbig2enc, pngquant, and unpaper are optional. If missing certain
-features are disabled. OCRmyPDF will discover them as soon as they are
-available.
-
-**jbig2enc**, if present, will be used to optimize the encoding of
-monochrome images. This can significantly reduce the file size of the
-output file. It is not required.
-`jbig2enc <https://github.com/agl/jbig2enc>`__ is not generally
-available for Ubuntu or Debian due to lingering concerns about patent
-issues, but can easily be built from source. To add JBIG2 encoding, see
-:ref:`jbig2`.
-
-**pngquant**, if present, is optionally used to optimize the encoding of
-PNG-style images in PDFs (actually, any that are that losslessly
-encoded) by lossily quantizing to a smaller color palette. It is only
-activated then the ``--optimize`` argument is ``2`` or ``3``.
-
-**unpaper**, if present, enables the ``--clean`` and ``--clean-final``
-command line options.
-
-These are in addition to the Python packaging dependencies, meaning that
-unfortunately, the ``pip install`` command cannot satisfy all of them.
-
-Installing HEAD revision from sources
-=====================================
-
-If you have ``git`` and Python 3.10 or newer installed, you can install
-from source. When the ``pip`` installer runs, it will alert you if
-dependencies are missing.
-
-If you prefer to build every from source, you will need to `build
-pikepdf from
-source <https://pikepdf.readthedocs.io/en/latest/installation.html#building-from-source>`__.
-First ensure you can build and install pikepdf.
-
-To install the HEAD revision from sources in the current Python 3
-environment:
-
-.. code-block:: bash
-
-    pip install git+https://github.com/ocrmypdf/OCRmyPDF.git
-
-Or, to install in editable mode
-allowing customization of OCRmyPDF, use the ``-e`` flag:
-
-.. code-block:: bash
-
-    pip install -e git+https://github.com/ocrmypdf/OCRmyPDF.git
-
-You may find it easiest to install in a virtual environment, rather than
-system-wide:
-
-.. code-block:: bash
-
-    git clone -b main https://github.com/ocrmypdf/OCRmyPDF.git
-    python3 -m venv .venv
-    source .venv/bin/activate
-    cd OCRmyPDF
-    pip install .
-
-However, ``ocrmypdf`` will only be accessible on the system PATH when
-you activate the virtual environment.
-
-To run the program:
-
-.. code-block:: bash
-
-    ocrmypdf --help
-
-If not yet installed, the script will notify you about dependencies that
-need to be installed. The script requires specific versions of the
-dependencies. Older version than the ones mentioned in the release notes
-are likely not to be compatible to OCRmyPDF.
-
-For development
----------------
-
-To install all of the development and test requirements:
-
-.. code-block:: bash
-
-    git clone -b main https://github.com/ocrmypdf/OCRmyPDF.git
-    python -m venv .venv
-    source .venv/bin/activate
-    cd OCRmyPDF
-    pip install -e .[test]
-
-To add JBIG2 encoding, see :ref:`jbig2`.
-
-Shell completions
-=================
-
-Completions for ``bash`` and ``fish`` are available in the project's
-``misc/completion`` folder. The ``bash`` completions are likely ``zsh``
-compatible but this has not been confirmed. Package maintainers, please
-install these at the appropriate locations for your system.
-
-To manually install the ``bash`` completion, copy
-``misc/completion/ocrmypdf.bash`` to ``/etc/bash_completion.d/ocrmypdf``
-(rename the file).
-
-To manually install the ``fish`` completion, copy
-``misc/completion/ocrmypdf.fish`` to
-``~/.config/fish/completions/ocrmypdf.fish``.
-
-Note on 32-bit support
-======================
-
-Many Python libraries no longer provide 32-bit binary wheels for Linux. This
-includes many of the libraries that OCRmyPDF depends on, such as
-Pillow. The easiest way to express this to end users is to say we don't
-support 32-bit Linux.
-
-However, if your Linux distribution still supports 32-bit binaries, you
-can still install and use OCRmyPDF. A warning message will appear.
-In practice, OCRmyPDF may need more than 32-bit memory space to run when
-large documents are processed, so there are practical limitations to what
-users can accomplish with it. Still, for the common use case of an 32-bit
-ARM NAS or Raspberry Pi processing small documents, it should work.

docs/introduction.md

@@ -1,10 +1,7 @@
-.. SPDX-FileCopyrightText: 2022 James R. Barlow
-..
-.. SPDX-License-Identifier: CC-BY-SA-4.0
+% SPDX-FileCopyrightText: 2022 James R. Barlow
+% SPDX-License-Identifier: CC-BY-SA-4.0
 
-============
-Introduction
-============
+# Introduction
 
 OCRmyPDF is a Python application and library that adds text "layers" to images in
 PDFs, making scanned image PDFs searchable. It uses OCR to guess the text
@@ -13,31 +10,30 @@ that enable customization of its processing steps, and it is highly tolerant
 of PDFs containing scanned images and "born digital" content that doesn't
 require text recognition.
 
-About OCR
-=========
+## About OCR
 
-`Optical character
-recognition <https://en.wikipedia.org/wiki/Optical_character_recognition>`__
+[Optical character
+recognition](https://en.wikipedia.org/wiki/Optical_character_recognition)
 is a technology that converts images of typed or handwritten text, such as
 in a scanned document, into computer text that can be selected, searched and copied.
 
 OCRmyPDF uses
-`Tesseract <https://github.com/tesseract-ocr/tesseract>`__, a widely
+[Tesseract](https://github.com/tesseract-ocr/tesseract), a widely
 available open source OCR engine, to perform OCR.
 
-.. _raster-vector:
+(raster-vector)=
 
-About PDFs
-==========
+## About PDFs
 
 PDFs are page description files that attempt to preserve a layout
-exactly. They contain `vector
-graphics <http://vector-conversions.com/vectorizing/raster_vs_vector.html>`__
+exactly. They contain [vector
+graphics](http://vector-conversions.com/vectorizing/raster_vs_vector.html)
 that can contain raster objects, such as scanned images. Because PDFs can
 contain multiple pages (unlike many image formats) and can contain fonts
 and text, they are a suitable format for exchanging scanned documents.
 
-|image|
+:::{image} images/bitmap_vs_svg.svg
+:::
 
 A PDF page may contain multiple images, even if it appears to have only
 one image. Some scanners or scanning software may segment pages into
@@ -48,10 +44,9 @@ Rasterizing a PDF is the process of generating corresponding raster images.
 OCR engines like Tesseract work with images, not scalable vector graphics
 or mixed raster-vector-text graphics such as PDF.
 
-About PDF/A
-===========
+## About PDF/A
 
-`PDF/A <https://en.wikipedia.org/wiki/PDF/A>`__ is an ISO-standardized
+[PDF/A](https://en.wikipedia.org/wiki/PDF/A) is an ISO-standardized
 subset of the full PDF specification that is designed for archiving (the
 'A' stands for Archive). PDF/A differs from PDF primarily by omitting
 features that could complicate future file readability,
@@ -63,8 +58,8 @@ of embedded content, it is likely more secure.
 There are various conformance levels and versions, such as "PDF/A-2b".
 
 In general, the preferred format for scanned documents is PDF/A. Some
-governments and jurisdictions, US Courts in particular, `mandate the use
-of PDF/A <https://pdfblog.com/2012/02/13/what-is-pdfa/>`__ for scanned
+governments and jurisdictions, US Courts in particular, [mandate the use
+of PDF/A](https://pdfblog.com/2012/02/13/what-is-pdfa/) for scanned
 documents.
 
 Since most individuals scanning documents aim for long-term readability,
@@ -78,13 +73,12 @@ files can be digitally signed but may not be encrypted to ensure future
 readability. Fortunately, converting from PDF/A to a regular PDF is
 straightforward, and any PDF viewer can handle PDF/A files.
 
-What OCRmyPDF does
-==================
+## What OCRmyPDF does
 
 OCRmyPDF analyzes each page of a PDF to determine the required colorspace
 and resolution (DPI) for capturing all the information on that page without
 losing content. It uses
-`Ghostscript <http://ghostscript.com/>`__ to rasterize each page and subsequently
+[Ghostscript](http://ghostscript.com/) to rasterize each page and subsequently
 performs OCR on the rasterized image to generate an OCR "layer." This layer
 is then integrated back into the original PDF.
 
@@ -101,10 +95,9 @@ options are utilized, the OCR layer is integrated into the processed image.
 By default, OCRmyPDF generates archival PDFs in the PDF/A format, which is
 a more rigid subset of PDF features designed for long-term archives. If you
 prefer regular PDFs, you can disable this feature using the
-``--output-type pdf`` option.
+`--output-type pdf` option.
 
-Why you shouldn't do this manually
-==================================
+## Why you shouldn't do this manually
 
 A PDF is similar to an HTML file, in that it contains document structure
 along with images. While some PDFs may solely display a full-page image,
@@ -142,55 +135,53 @@ like pikepdf and QPDF, it can auto-repair damaged PDFs. You don't need to
 understand the intricacies of these issues; you should be able to use
 OCRmyPDF with any PDF file, and expect reasonable results.
 
-Limitations
-===========
+## Limitations
 
 OCRmyPDF is subject to limitations imposed by the Tesseract OCR engine.
 These limitations are inherent to any software relying on Tesseract:
 
--  The OCR accuracy may not match that of commercial OCR solutions.
--  It is incapable of recognizing handwriting.
--  It may detect gibberish and report it as OCR output.
--  Results may be subpar when a document contains languages not specified
-   in the ``-l LANG`` argument.
--  Tesseract may struggle to analyze the natural reading order of documents.
-   For instance, it might fail to recognize two columns in a document and
-   attempt to join text across columns.
--  Poor quality scans can result in subpar OCR quality. In other words, the
-   quality of the OCR output depends on the quality of the input.
--  Tesseract does not provide information about the font family to which text
-   belongs.
--  Tesseract does not divide text into paragraphs or headings. It only provides
-   the text and its bounding box. As such, the generated PDF does not
-   contain any information about the document's structure.
+- The OCR accuracy may not match that of commercial OCR solutions.
+- It is incapable of recognizing handwriting.
+- It may detect gibberish and report it as OCR output.
+- Results may be subpar when a document contains languages not specified
+  in the `-l LANG` argument.
+- Tesseract may struggle to analyze the natural reading order of documents.
+  For instance, it might fail to recognize two columns in a document and
+  attempt to join text across columns.
+- Poor quality scans can result in subpar OCR quality. In other words, the
+  quality of the OCR output depends on the quality of the input.
+- Tesseract does not provide information about the font family to which text
+  belongs.
+- Tesseract does not divide text into paragraphs or headings. It only provides
+  the text and its bounding box. As such, the generated PDF does not
+  contain any information about the document's structure.
 
 Ghostscript also imposes some limitations:
 
--  PDFs containing JPEG 2000-encoded content may be converted to JPEG
-   encoding, which may introduce compression artifacts, if Ghostscript
-   PDF/A is enabled.
--  Ghostscript may transcode grayscale and color images, potentially
-   lossily, based on an internal algorithm. This
-   behavior can be suppressed by setting ``--pdfa-image-compression`` to
-   ``jpeg`` or ``lossless`` to set all images to one type or the other.
-   Ghostscript lacks an option to maintain the input image's format.
-   (Modern Ghostscript can copy JPEG images without transcoding them.)
--  Ghostscript's PDF/A conversion removes any XMP metadata that is not
-   one of the standard XMP metadata namespaces for PDFs. In particular,
-   PRISM Metadata is removed.
--  Ghostscript's PDF/A conversion may remove or deactivate
-   hyperlinks and other active content.
+- PDFs containing JPEG 2000-encoded content may be converted to JPEG
+  encoding, which may introduce compression artifacts, if Ghostscript
+  PDF/A is enabled.
+- Ghostscript may transcode grayscale and color images, potentially
+  lossily, based on an internal algorithm. This
+  behavior can be suppressed by setting `--pdfa-image-compression` to
+  `jpeg` or `lossless` to set all images to one type or the other.
+  Ghostscript lacks an option to maintain the input image's format.
+  (Modern Ghostscript can copy JPEG images without transcoding them.)
+- Ghostscript's PDF/A conversion removes any XMP metadata that is not
+  one of the standard XMP metadata namespaces for PDFs. In particular,
+  PRISM Metadata is removed.
+- Ghostscript's PDF/A conversion may remove or deactivate
+  hyperlinks and other active content.
 
-You can use ``--output-type pdf`` to disable PDF/A conversion and produce
+You can use `--output-type pdf` to disable PDF/A conversion and produce
 a standard, non-archival PDF.
 
 Regarding OCRmyPDF itself:
 
--  PDFs using transparency are not currently represented in the test
-   suite
+- PDFs using transparency are not currently represented in the test
+  suite
 
-Similar programs
-================
+## Similar programs
 
 To the author's knowledge, OCRmyPDF is the most feature-rich and
 thoroughly tested command line OCR PDF conversion tool. If it does not
@@ -199,8 +190,7 @@ meet your needs, contributions and suggestions are welcome.
 Ghostscript recently added three "pdfocr" output devices. They work by
 rasterizing all content and converting all pages to a single colour space.
 
-Web front-ends
-==============
+## Web front-ends
 
 The Docker image of OCRmyPDF provides a web service front-end
 that allows files to submitted over HTTP, and the results can be downloaded.
@@ -210,16 +200,14 @@ public internet and does not provide any security measures.
 
 In addition, the following third-party integrations are available:
 
--  `Paperless-ngx <https://docs.paperless-ngx.com/>`__ is a free software
-   document management system that uses OCRmyPDF to perform OCR on
-   uploaded documents.
--  `Nextcloud OCR <https://github.com/janis91/ocr>`__ is a free software
-   plugin for the Nextcloud private cloud software.
+- [Paperless-ngx](https://docs.paperless-ngx.com/) is a free software
+  document management system that uses OCRmyPDF to perform OCR on
+  uploaded documents.
+- [Nextcloud OCR](https://github.com/janis91/ocr) is a free software
+  plugin for the Nextcloud private cloud software.
 
 OCRmyPDF is not designed to be secure against malware-bearing PDFs (see
-`Using OCRmyPDF online <ocr-service>`__). Users should ensure they
+[Using OCRmyPDF online](ocr-service)). Users should ensure they
 comply with OCRmyPDF's licenses and the licenses of all dependencies. In
 particular, OCRmyPDF requires Ghostscript, which is licensed under
 AGPLv3.
-
-.. |image| image:: images/bitmap_vs_svg.svg

docs/jbig2.md

@@ -0,0 +1,74 @@
+% SPDX-FileCopyrightText: 2022 James R. Barlow
+% SPDX-License-Identifier: CC-BY-SA-4.0
+
+{#jbig2}
+
+# Installing the JBIG2 encoder
+
+Most Linux distributions do not include a JBIG2 encoder since JBIG2
+encoding was patented for a long time. All known JBIG2 US patents have
+expired as of 2017, but it is possible that unknown patents exist.
+
+JBIG2 encoding is recommended for OCRmyPDF and is used to losslessly
+create smaller PDFs. If JBIG2 encoding is not available, lower quality
+CCITT encoding will be used for monochrome images.
+
+JBIG2 decoding is not patented and is performed automatically by most
+PDF viewers. It is widely supported and has been part of the PDF
+specification since 2001.
+
+JBIG encoding is automatically provided by these OCRmyPDF packages: -
+Docker image (both Ubuntu and Alpine) - Snap package - ArchLinux AUR
+package - Alpine Linux package - Homebrew on macOS
+
+For all other platforms, you would need to build the JBIG2 encoder from
+source:
+
+:::{code} bash
+git clone https://github.com/agl/jbig2enc
+cd jbig2enc
+./autogen.sh
+./configure && make
+[sudo] make install
+:::
+
+Dependencies include libtoolize and libleptonica, which on Ubuntu
+systems are packaged as libtool and libleptonica-dev. On Fedora (35)
+they are packaged as libtool and leptonica-devel. For this to work,
+please make sure to install `autotools`, `automake`, `libtool` and
+`leptonica` first if not already installed.
+
+:::{code} bash
+[sudo] apt install autotools-dev automake libtool libleptonica-dev
+:::
+
+{#jbig2-lossy}
+
+## Lossy mode JBIG2
+
+OCRmyPDF provides lossy mode JBIG2 as an advanced and potentially
+dangerous feature. Users should [review the technical concerns with
+JBIG2 in lossy mode](https://en.wikipedia.org/wiki/JBIG2#Disadvantages)
+and decide if this feature is acceptable for their use case. In general,
+this mode should not be used for archival purposes, should not be used
+when the original document is not available or will be destroyed, and
+should not be used when numbers present in the document are important,
+because there is a risk of 6/8 and 8/6 substitution errors.
+
+JBIG2 lossy mode does achieve higher compression ratios than any other
+monochrome (bitonal) compression technology; for large text documents
+the savings are considerable. JBIG2 lossless still gives great
+compression ratios and is a major improvement over the older CCITT G4
+standard.
+
+To turn on JBIG2 lossy mode, add the argument `--jbig2-lossy`.
+`--optimize {1,2,3}` are necessary for the argument to take effect also
+required. Also, a JBIG2 encoder must be installed as described in the
+previous section.
+
+You can adjust the threshold for JBIG2 compression with the
+`--jbig2-threshold`. The default is 0.85, meaning that if two symbols
+are 85% similar, they will be compressed together.
+
+*Due to an oversight, ocrmypdf v7.0 and v7.1 used lossy mode by
+default.*

docs/jbig2.rst

@@ -1,83 +0,0 @@
-.. SPDX-FileCopyrightText: 2022 James R. Barlow
-..
-.. SPDX-License-Identifier: CC-BY-SA-4.0
-
-.. _jbig2:
-
-============================
-Installing the JBIG2 encoder
-============================
-
-Most Linux distributions do not include a JBIG2 encoder since JBIG2
-encoding was patented for a long time. All known JBIG2 US patents have
-expired as of 2017, but it is possible that unknown patents exist.
-
-JBIG2 encoding is recommended for OCRmyPDF and is used to losslessly
-create smaller PDFs. If JBIG2 encoding is not available, lower quality
-CCITT encoding will be used for monochrome images.
-
-JBIG2 decoding is not patented and is performed automatically by most
-PDF viewers. It is widely supported and has been part of the PDF
-specification since 2001.
-
-JBIG encoding is automatically provided by these OCRmyPDF packages:
-- Docker image (both Ubuntu and Alpine)
-- Snap package
-- ArchLinux AUR package
-- Alpine Linux package
-- Homebrew on macOS
-
-For all other platforms, you would need to build the JBIG2 encoder from source:
-
-.. code-block:: bash
-
-   git clone https://github.com/agl/jbig2enc
-   cd jbig2enc
-   ./autogen.sh
-   ./configure && make
-   [sudo] make install
-
-.. _jbig2-lossy:
-
-Dependencies include libtoolize and libleptonica, which on Ubuntu systems
-are packaged as libtool and libleptonica-dev. On Fedora (35) they are packaged
-as libtool and leptonica-devel. For this to work, please make sure to install
-``autotools``, ``automake``, ``libtool`` and ``leptonica`` first if not already
-installed.
-
-.. code-block:: bash
-
-    [sudo] apt install autotools-dev automake libtool libleptonica-dev
-..
-
-
-Lossy mode JBIG2
-================
-
-OCRmyPDF provides lossy mode JBIG2 as an advanced and potentially dangerous
-feature. Users should
-`review the technical concerns with JBIG2 in lossy
-mode <https://en.wikipedia.org/wiki/JBIG2#Disadvantages>`__
-and decide if this feature is acceptable for their use case. In general,
-this mode should not be used for archival purposes, should not be used when
-the original document is not available or will be destroyed, and should
-not be used when numbers present in the document are important, because
-there is a risk of 6/8 and 8/6 substitution errors.
-
-JBIG2 lossy mode does achieve higher compression ratios than any other
-monochrome (bitonal) compression technology; for large text documents
-the savings are considerable. JBIG2 lossless still gives great
-compression ratios and is a major improvement over the older CCITT G4
-standard.
-
-To turn on JBIG2 lossy mode, add the argument ``--jbig2-lossy``.
-``--optimize {1,2,3}`` are necessary for the argument to take effect
-also required. Also, a JBIG2 encoder must be installed as described in
-the previous section.
-
-You can adjust the threshold for JBIG2 compression with the
-``--jbig2-threshold``. The default is 0.85, meaning that if two symbols
-are 85% similar, they will be compressed together.
-
-*Due to an oversight, ocrmypdf v7.0 and v7.1 used lossy mode by
-default.*

docs/languages.md

@@ -0,0 +1,129 @@
+% SPDX-FileCopyrightText: 2022 James R. Barlow
+% SPDX-License-Identifier: CC-BY-SA-4.0
+
+(lang-packs)=
+
+# Installing additional language packs
+
+OCRmyPDF uses Tesseract for OCR, and relies on its language packs for all languages.
+On most platforms, English is installed with Tesseract by default, but not always.
+
+Tesseract supports [most
+languages](https://github.com/tesseract-ocr/tesseract/blob/main/doc/tesseract.1.asc#languages).
+Languages are identified by standardized three-letter codes (called ISO 639-2 Alpha-3).
+Tesseract's documentation also lists the three-letter code for your language.
+Some are anglicized, e.g. Spanish is `spa` rather than `esp`, while others
+are not, e.g. German is `deu` and French is `fra`.
+
+Language packs (strictly speaking, Tesseract "traineddata" files) generally correspond
+to the language in question, but different language packs are used in certain
+situations. For German, the "Fraktur" language pack can assist with reading older
+materials in the Fraktur typeface family (`deu_frak`). Some communities have changed
+their script from Cyrillic to Latin; the Cyrillic version of Uzbek is available
+as `uzb_cyrl` and the Latin version is `uzb`.
+
+After you have installed a language pack, you can use it with `ocrmypdf -l <language>`,
+for example `ocrmypdf -l spa`. For multilingual documents, you can specify
+all languages to be expected, e.g. `ocrmypdf -l eng+fra` for English and French.
+English is assumed by default unless other language(s) are specified.
+
+For Linux users, you can often find packages that provide language
+packs.
+
+## Platform install steps
+
+### Debian and Ubuntu (apt)
+
+```bash
+# Display a list of all Tesseract language packs
+apt-cache search tesseract-ocr
+
+# Install Chinese Simplified language pack
+apt-get install tesseract-ocr-chi-sim
+```
+
+You can then pass the `-l LANG` argument to OCRmyPDF to give a hint as
+to what languages it should search for. Multiple languages can be
+requested using either `-l eng+fra` (English and French) or
+`-l eng -l fra`.
+
+### Fedora
+
+```bash
+# Display a list of all Tesseract language packs
+dnf search tesseract
+
+# Install Chinese Simplified language pack
+dnf install tesseract-langpack-chi_sim
+```
+
+You can then pass the `-l LANG` argument to OCRmyPDF to give a hint as
+to what languages it should search for. Multiple languages can be
+requested using either `-l eng+fra` (English and French) or
+`-l eng -l fra`.
+
+### Arch Linux
+
+```bash
+# Display a list of all Tesseract language packs
+pacman -Ss tesseract-data
+
+# Install German language pack
+pacman -S tesseract-data-deu
+```
+
+You can then pass the `-l LANG` argument to OCRmyPDF to give a hint as
+to what languages it should search for. Multiple languages can be
+requested using either `-l eng+fra` (English and French) or
+`-l eng -l fra`.
+
+### Gentoo
+
+On Gentoo the package `app-text/tessdata_fast`, which `app-text/tesseract` depends on, handles Tesseract languages.
+It accepts USE flags to select what languages should be installed, these can be set in `/etc/portage/package.use`.
+Alternatively one can globally set the [L10N use extension](https://wiki.gentoo.org/wiki/Localization/Guide#L10N) in `/etc/portage/make.conf`.
+This enables these languages for all packages (e.g. including aspell).
+
+```bash
+# Display a list of all Tesseract language packs
+equery uses app-text/tessdata_fast
+
+# Add English and German language support for Tesseract only
+echo 'app-text/tessdata_fast l10n_de l10n_en' >> /etc/portage/package.use
+
+# Add global English and German language support (the `l10n_` from equery has to be omitted)
+echo L10N="de en" >> /etc/portage/make.conf
+
+# update system to reflect changed USE flags
+emerge --update --deep --newuse @world
+```
+
+You can then pass the `-l LANG` argument to OCRmyPDF to give a hint as
+to what languages it should search for. Multiple languages can be
+requested using either `-l eng+fra` (English and French) or
+`-l eng -l fra`.
+
+### macOS
+
+You can install additional language packs by
+{ref}`installing Tesseract using Homebrew with all language packs <macos-all-languages>`.
+
+### Docker
+
+Users of the OCRmyPDF Docker image should install language packs into a
+derived Docker image as
+{ref}`described in that section <docker-lang-packs>`.
+
+### Windows
+
+The Tesseract installer provided by Chocolatey currently includes only English language.
+To install other languages, download the respective language pack (`.traineddata` file)
+from <https://github.com/tesseract-ocr/tessdata/> and place it in
+`C:\\Program Files\\Tesseract-OCR\\tessdata` (or wherever Tesseract OCR is installed).
+
+## Custom language packs
+
+If you have fine-tuned or trained Tesseract and generated custom trained data, you can
+copy your `customlang.traineddata` file into your Tesseract "tessdata" folder, and
+then use the `-l customlang` argument to tell OCRmyPDF to pass that language on to
+Tesseract.

docs/languages.rst

@@ -1,141 +0,0 @@
-.. SPDX-FileCopyrightText: 2022 James R. Barlow
-..
-.. SPDX-License-Identifier: CC-BY-SA-4.0
-
-.. _lang-packs:
-
-====================================
-Installing additional language packs
-====================================
-
-OCRmyPDF uses Tesseract for OCR, and relies on its language packs for all languages.
-On most platforms, English is installed with Tesseract by default, but not always.
-
-Tesseract supports `most
-languages <https://github.com/tesseract-ocr/tesseract/blob/main/doc/tesseract.1.asc#languages>`__.
-Languages are identified by standardized three-letter codes (called ISO 639-2 Alpha-3).
-Tesseract's documentation also lists the three-letter code for your language.
-Some are anglicized, e.g. Spanish is ``spa`` rather than ``esp``, while others
-are not, e.g. German is ``deu`` and French is ``fra``.
-
-Language packs (strictly speaking, Tesseract "traineddata" files) generally correspond
-to the language in question, but different language packs are used in certain
-situations. For German, the "Fraktur" language pack can assist with reading older
-materials in the Fraktur typeface family (``deu_frak``). Some communities have changed
-their script from Cyrillic to Latin; the Cyrillic version of Uzbek is available
-as ``uzb_cyrl`` and the Latin version is ``uzb``.
-
-After you have installed a language pack, you can use it with ``ocrmypdf -l <language>``,
-for example ``ocrmypdf -l spa``. For multilingual documents, you can specify
-all languages to be expected, e.g. ``ocrmypdf -l eng+fra`` for English and French.
-English is assumed by default unless other language(s) are specified.
-
-For Linux users, you can often find packages that provide language
-packs.
-
-Platform install steps
-======================
-
-Debian and Ubuntu (apt)
------------------------
-
-.. code-block:: bash
-
-   # Display a list of all Tesseract language packs
-   apt-cache search tesseract-ocr
-
-   # Install Chinese Simplified language pack
-   apt-get install tesseract-ocr-chi-sim
-
-You can then pass the ``-l LANG`` argument to OCRmyPDF to give a hint as
-to what languages it should search for. Multiple languages can be
-requested using either ``-l eng+fra`` (English and French) or
-``-l eng -l fra``.
-
-Fedora
-------
-
-.. code-block:: bash
-
-   # Display a list of all Tesseract language packs
-   dnf search tesseract
-
-   # Install Chinese Simplified language pack
-   dnf install tesseract-langpack-chi_sim
-
-You can then pass the ``-l LANG`` argument to OCRmyPDF to give a hint as
-to what languages it should search for. Multiple languages can be
-requested using either ``-l eng+fra`` (English and French) or
-``-l eng -l fra``.
-
-Archlinux
-------
-
-.. code-block:: bash
-
-   # Display a list of all Tesseract language packs
-   pacman -Ss tesseract-data
-
-   # Install German language pack
-   pacman -S tesseract-data-deu
-
-You can then pass the ``-l LANG`` argument to OCRmyPDF to give a hint as
-to what languages it should search for. Multiple languages can be
-requested using either ``-l eng+fra`` (English and French) or
-``-l eng -l fra``.
-
-Gentoo
-------
-
-On Gentoo the package ``app-text/tessdata_fast``, which ``app-text/tesseract`` depends on, handles Tesseract languages.
-It accepts USE flags to select what languages should be installed, these can be set in ``/etc/portage/package.use``.
-Alternatively one can globally set the `L10N use extension <https://wiki.gentoo.org/wiki/Localization/Guide#L10N>`__ in ``/etc/portage/make.conf``.
-This enables these languages for all packages (e.g. including aspell).
-
-.. code-block:: bash
-
-   # Display a list of all Tesseract language packs
-   equery uses app-text/tessdata_fast
-
-   # Add English and German language support for Tesseract only
-   echo 'app-text/tessdata_fast l10n_de l10n_en' >> /etc/portage/package.use
-
-   # Add global English and German language support (the `l10n_` from equery has to be omitted)
-   echo L10N="de en" >> /etc/portage/make.conf
-
-   # update system to reflect changed USE flags
-   emerge --update --deep --newuse @world
-
-You can then pass the ``-l LANG`` argument to OCRmyPDF to give a hint as
-to what languages it should search for. Multiple languages can be
-requested using either ``-l eng+fra`` (English and French) or
-``-l eng -l fra``.
-
-macOS
------
-
-You can install additional language packs by
-:ref:`installing Tesseract using Homebrew with all language packs <macos-all-languages>`.
-
-Docker
-------
-
-Users of the OCRmyPDF Docker image should install language packs into a
-derived Docker image as
-:ref:`described in that section <docker-lang-packs>`.
-
-Windows
--------
-
-The Tesseract installer provided by Chocolatey currently includes only English language.
-To install other languages, download the respective language pack (``.traineddata`` file)
-from https://github.com/tesseract-ocr/tessdata/ and place it in
-``C:\\Program Files\\Tesseract-OCR\\tessdata`` (or wherever Tesseract OCR is installed).
-
-Custom language packs
-=====================
-
-If you have fine-tuned or trained Tesseract and generated custom trained data, you can
-copy your ``customlang.traineddata`` file into your Tesseract "tessdata" folder, and
-then use the ``-l customlang`` argument to tell OCRmyPDF to pass that language on to
-Tesseract.

docs/maintainers.md

@@ -0,0 +1,71 @@
+% SPDX-FileCopyrightText: 2022 James R. Barlow
+% SPDX-License-Identifier: CC-BY-SA-4.0
+
+# Maintainer notes
+
+This is for those who package OCRmyPDF for downstream use. (Thank you
+for your hard work.)
+
+## Known ports/packagers
+
+OCRmyPDF has been ported to many platforms already. If you are
+interesting in porting to a new platform, check with
+[Repology](https://repology.org/projects/?search=ocrmypdf) to see the
+status of that platform.
+
+### Make sure you can package pikepdf
+
+pikepdf, created by the same author, is a mixed Python and C++14 package
+with much stiffer build requirements. If you want to use OCRmyPDF on
+some novel platform or distribution, first make sure you can package
+pikepdf.
+
+### Non-Python dependencies
+
+Note that we have non-Python dependencies. In particular, OCRmyPDF
+requires Ghostscript and Tesseract OCR to be installed and needs to be
+able to locate their binaries on the system PATH. On Windows, OCRmyPDF
+will also check the registry for their locations.
+
+Tesseract OCR relies on SIMD for performance and only has proper support
+for this on ARM and x86\_64. Performance may be poor on other processor
+architectures.
+
+### Versioning scheme
+
+OCRmyPDF uses hatch-vcs for versioning, which derives the version from
+Git as a single source of truth. This may be unsuitable for some
+distributions, e.g. to indicate that your distribution modifies OCRmyPDF
+in some way.
+
+You can patch the `__version__` variable in `src/ocrmypdf/_version.py`
+if necessary, or set the environment variable
+`SETUPTOOLS_SCM_PRETEND_VERSION` to the required version, if you need to
+override versioning for some reason.
+
+### jbig2enc
+
+OCRmyPDF will use jbig2enc, a JBIG2 encoder, if one can be found. Some
+distributions have shied away from packaging JBIG2 because it contains
+patented algorithms, but all patents have expired since 2017. If
+possible, consider packaging it too to improve OCRmyPDF\'s compression.
+
+### Command line completions
+
+Please ensure that command line completions are installed, as described
+in the installation documentation.
+
+### 32-bit Linux support
+
+If you maintain a Linux distribution that supports 32-bit x86 or ARM,
+OCRmyPDF should continue to work as long as all of its dependencies
+continue to be available in 32-bit form. Please note we do not test on
+32-bit platforms.
+
+### HEIF/HEIC
+
+OCRmyPDF defaults to installing the pi-heif PyPI package, which supports
+converting HEIF (High Efficiency Image File Format) images to PDF from
+the command line. If your distribution does not have this library
+available, you can exclude it and OCRmyPDF will gracefully degrade
+automatically, losing only support for this feature.

docs/maintainers.rst

@@ -1,77 +0,0 @@
-.. SPDX-FileCopyrightText: 2022 James R. Barlow
-..
-.. SPDX-License-Identifier: CC-BY-SA-4.0
-
-================
-Maintainer notes
-================
-
-This is for those who package OCRmyPDF for downstream use.  (Thank you
-for your hard work.)
-
-Known ports/packagers
-=====================
-
-OCRmyPDF has been ported to many platforms already. If you are interesting in
-porting to a new platform, check with
-`Repology <https://repology.org/projects/?search=ocrmypdf>`__ to see the status
-of that platform.
-
-Make sure you can package pikepdf
----------------------------------
-
-pikepdf, created by the same author, is a mixed Python and C++14 package with
-much stiffer build requirements. If you want to use OCRmyPDF on some novel platform
-or distribution, first make sure you can package pikepdf.
-
-Non-Python dependencies
------------------------
-
-Note that we have non-Python dependencies. In particular, OCRmyPDF requires
-Ghostscript and Tesseract OCR to be installed and needs to be able to locate their
-binaries on the system PATH. On Windows, OCRmyPDF will also check the registry
-for their locations.
-
-Tesseract OCR relies on SIMD for performance and only has proper support for this
-on ARM and x86_64. Performance may be poor on other processor architectures.
-
-Versioning scheme
------------------
-
-OCRmyPDF uses hatch-vcs for versioning, which derives the version from
-Git as a single source of truth. This may be unsuitable for some distributions, e.g.
-to indicate that your distribution modifies OCRmyPDF in some way.
-
-You can patch the ``__version__`` variable in ``src/ocrmypdf/_version.py`` if
-necessary, or set the environment variable ``SETUPTOOLS_SCM_PRETEND_VERSION``
-to the required version, if you need to override versioning for some reason.
-
-jbig2enc
---------
-
-OCRmyPDF will use jbig2enc, a JBIG2 encoder, if one can be found. Some distributions
-have shied away from packaging JBIG2 because it contains patented algorithms, but
-all patents have expired since 2017. If possible, consider packaging it too to
-improve OCRmyPDF's compression.
-
-Command line completions
-------------------------
-
-Please ensure that command line completions are installed, as described in the
-installation documentation.
-
-32-bit Linux support
---------------------
-
-If you maintain a Linux distribution that supports 32-bit x86 or ARM, OCRmyPDF
-should continue to work as long as all of its dependencies continue to be
-available in 32-bit form. Please note we do not test on 32-bit platforms.
-
-HEIF/HEIC
----------
-
-OCRmyPDF defaults to installing the pi-heif PyPI package, which supports converting
-HEIF (High Efficiency Image File Format) images to PDF from the command line.
-If your distribution does not have this library available, you can exclude it and
-OCRmyPDF will gracefully degrade automatically, losing only support for this
-feature.

docs/optimizer.md

@@ -0,0 +1,111 @@
+% SPDX-FileCopyrightText: 2022 James R. Barlow
+% SPDX-License-Identifier: CC-BY-SA-4.0
+
+# PDF optimization
+
+OCRmyPDF includes an image-oriented PDF optimizer. By default, the
+optimizer runs with safe settings with the goal of improving compression
+at no loss of quality. At higher optimization levels, lossy
+optimizations may be applied and tuned. Optimization occurs after OCR,
+and only if OCR succeeded. It does not perform other possible
+optimizations such as deduplicating resources, consolidating fonts,
+simplifying vector drawings, or anything of that nature.
+
+:::{list-table} OCRmyPDF optimization settings
+---
+widths: 33 6 60
+header-rows: 1
+---
+
+* - Optimization level
+  - Shorthand
+  - Description
+* - ``--optimize 0``
+  - ``-O0``
+  - Disable most optimizations.
+* - ``--optimize 1`` (default)
+  - ``-O1``
+  - Enables lossless optimizations, such as transcoding images to more
+      efficient formats. Also compress other uncompressed objects in the
+      PDF and enables the more efficient "object streams" within the PDF.
+      (If ``--jbig2-lossy`` is issued, then lossy JBIG2 optimization is used.
+      The decision to use lossy JBIG2 is separate from standard optimization
+      settings.)
+* - ``--optimize 2``
+  - ``-O2``
+  - All of the above, and enables lossy optimizations and color quantization.
+* - ``--optimize 3``
+  - ``-O3``
+  - All of the above, and enables more aggressive optimizations and targets lower
+      image quality.
+:::
+
+The exact type of optimizations performed will vary over time, and
+depend on what third party tools are installed.
+
+Despite optimizations, OCRmyPDF might still increase the overall file
+size, since it must embed information about the recognized text, and
+depending on the settings chosen, may not be able to represent the
+output file as compactly as the input file.
+
+## Optimizations that always occurs
+
+OCRmyPDF will automatically replace obsolete or inferior compression
+schemes such as RLE or LZW with superior schemes such as Deflate, and
+convert monochrome images to CCITT G4. Since this is lossless, it always
+occurs and there is no way to disable it. Other non-image compressed
+objects are compressed as well.
+
+## Fast web view
+
+OCRmyPDF automatically optimizes PDFs for \"fast web view\" in Adobe
+Acrobat\'s parlance, or equivalently, linearizes PDFs so that the
+resources they reference are presented in the order a viewer needs them
+for sequential display. This reduces the latency of viewing a PDF both
+online and from local storage, in exchange for a slight increase in file
+size.
+
+To disable this optimization and all others, use
+`ocrmypdf --optimize 0 ...` or the shorthand `-O0`.
+
+Adobe Acrobat might not report the file as being \"fast web view\".
+
+## Lossless optimizations
+
+At optimization level `-O1` (the default), OCRmyPDF will also attempt
+lossless image optimization.
+
+If a JBIG2 encoder is available, then monochrome images will be
+converted to JBIG2, with the potential for huge savings on large black
+and white images, since JBIG2 is far more efficient than any other
+monochrome (bi-level) compression. (All known US patents related to
+JBIG2 have probably expired, but it remains the responsibility of the
+user to supply a JBIG2 encoder such as
+[jbig2enc](https://github.com/agl/jbig2enc). OCRmyPDF does not implement
+JBIG2 encoding on its own.)
+
+OCRmyPDF currently does not attempt to recompress losslessly compressed
+objects more aggressively.
+
+## Lossy optimizations
+
+At optimization level `-O1`, `-O2` and `-O3`, OCRmyPDF will some attempt
+loss image optimization.
+
+If Ghostscript is used to create a PDF/A (the default), Ghostscript will
+optimize some images by converting them to JPEG, which are lossy. If
+`--output-type pdf` is used, there are no lossy optimizations. Ghostscript's
+JPEG conversion is quite safe.
+
+If `pngquant` is installed, OCRmyPDF will use it to perform quantize
+paletted images to reduce their size.
+
+The quality of JPEGs may be lowered, on the assumption that a lower
+quality image may be suitable for storage after OCR.
+
+It is not possible to optimize all image types. Uncommon image types may
+be skipped by the optimizer.
+
+OCRmyPDF provides `lossy mode JBIG2 <jbig2-lossy>`{.interpreted-text
+role="ref"} as an advanced feature that additional requires the argument
+`--jbig2-lossy`.

docs/optimizer.rst

@@ -1,100 +0,0 @@
-.. SPDX-FileCopyrightText: 2022 James R. Barlow
-..
-.. SPDX-License-Identifier: CC-BY-SA-4.0
-
-================
-PDF optimization
-================
-
-OCRmyPDF includes an image-oriented PDF optimizer. By default, the optimizer
-runs with safe settings with the goal of improving compression at no loss of
-quality. At higher optimization levels, lossy optimizations may be applied and
-tuned. Optimization occurs after OCR, and only if OCR succeeded.  It does not
-perform other possible optimizations such as deduplicating resources,
-consolidating fonts, simplifying vector drawings, or anything of that nature.
-
-.. list-table:: Title
-   :widths: 33 6 60
-   :header-rows: 1
-
-    * - Optimization level
-      - Shorthand
-      - Description
-    * - ``--optimize 0``
-      - ``-O0``
-      - Disable most optimizations.
-    * - ``--optimize 1`` (default)
-      - ``-O1``
-      - Safe and lossless optimizations.
-    * - ``--optimize 2``
-      - ``-O2``
-      - Safe and lossy optimizations.
-    * - ``--optimize 3``
-      - ``-O3``
-      - Aggressive lossy optimizations.
-
-The exact type of optimizations performed will vary over time, and depend on
-the availability of third-party tools.
-
-Despite optimizations, OCRmyPDF might still increase the overall file size,
-since it must embed information about the recognized text, and depending on the
-settings chosen, may not be able to represent the output file as compactly as
-the input file.
-
-Optimizations that always occurs
-================================
-
-OCRmyPDF will automatically replace obsolete or inferior compression schemes
-such as RLE or LZW with superior schemes such as Deflate, and convert
-monochrome images to CCITT G4. Since this is lossless, it always occurs and there
-is no way to disable it. Other non-image compressed objects are compressed as
-well.
-
-Fast web view
-=============
-
-OCRmyPDF automatically optimizes PDFs for "fast web view" in Adobe Acrobat's
-parlance, or equivalently, linearizes PDFs so that the resources they reference
-are presented in the order a viewer needs them for sequential display. This
-reduces the latency of viewing a PDF both online and from local storage, in
-exchange for a slight increase in file size.
-
-To disable this optimization and all others, use ``ocrmypdf --optimize 0 ...``
-or the shorthand ``-O0``.
-
-Adobe Acrobat might not report the file as being "fast web view".
-
-Lossless optimizations
-======================
-
-At optimization level ``-O1`` (the default), OCRmyPDF will also attempt lossless
-image optimization.
-
-If a JBIG2 encoder is available, then monochrome images will be converted to
-JBIG2, with the potential for huge savings on large black and white images,
-since JBIG2 is far more efficient than any other monochrome (bi-level)
-compression. (All known US patents related to JBIG2 have probably expired, but
-it remains the responsibility of the user to supply a JBIG2 encoder such as
-`jbig2enc <https://github.com/agl/jbig2enc>`__. OCRmyPDF does not implement
-JBIG2 encoding on its own.)
-
-OCRmyPDF currently does not attempt to recompress losslessly compressed objects
-more aggressively.
-
-Lossy optimizations
-===================
-
-At optimization level ``-O2`` and ``-O3``, OCRmyPDF will some attempt lossy
-image optimization.
-
-If ``pngquant`` is installed, OCRmyPDF will use it to perform quantize paletted
-images to reduce their size.
-
-The quality of JPEGs may be lowered, on the assumption that a lower quality
-image may be suitable for storage after OCR.
-
-It is not possible to optimize all image types. Uncommon image types may be
-skipped by the optimizer.
-
-OCRmyPDF provides :ref:`lossy mode JBIG2 <jbig2-lossy>` as an advanced feature
-that additional requires the argument ``--jbig2-lossy``.

docs/pdfsecurity.md

@@ -1,13 +1,9 @@
-.. SPDX-FileCopyrightText: 2022 James R. Barlow
-..
-.. SPDX-License-Identifier: CC-BY-SA-4.0
+(security)=
 
-===================
-PDF security issues
-===================
+# PDF security issues
 
-   OCRmyPDF should only be used on PDFs you trust. It is not designed to
-   protect you against malware.
+> OCRmyPDF should only be used on PDFs you trust. It is not designed to
+> protect you against malware.
 
 Recognizing that many users have an interest in handling PDFs and
 applying OCR to PDFs they did not generate themselves, this article
@@ -16,89 +12,84 @@ themselves.
 
 The disclaimer applies: this software has no warranties of any kind.
 
-PDFs may contain malware
-========================
+## PDFs may contain malware
 
 PDF is a rich, complex file format. The official PDF 1.7 specification,
 ISO 32000:2008, is hundreds of pages long and references several annexes
 each of which are similar in length. PDFs can contain video, audio, XML,
 JavaScript and other programming, and forms. In some cases, they can
-open internet connections to pre-selected URLs. All of these are possible
-attack vectors.
+open internet connections to pre-selected URLs. All of these are
+possible attack vectors.
 
-In short, PDFs `may contain
-viruses <https://security.stackexchange.com/questions/64052/can-a-pdf-file-contain-a-virus>`__.
+In short, PDFs [may contain
+viruses](https://security.stackexchange.com/questions/64052/can-a-pdf-file-contain-a-virus).
 
 If you do not trust a PDF or its source, do not open it or use OCRmyPDF
 on it. Consider using a Docker container or virtual machine to isolate
 an untrusted PDF from your system.
 
-How OCRmyPDF processes PDFs
-===========================
+## How OCRmyPDF processes PDFs
 
 OCRmyPDF must open and interpret your PDF in order to insert an OCR
 layer. First, it runs all PDFs through
-`pikepdf <https://github.com/pikepdf/pikepdf>`__, a library based on
-`QPDF <https://github.com/qpdf/qpdf>`__, a program that repairs PDFs
-with syntax errors. This is done because, in the author's experience, a
+[pikepdf](https://github.com/pikepdf/pikepdf), a library based on
+[QPDF](https://github.com/qpdf/qpdf), a program that repairs PDFs with
+syntax errors. This is done because, in the author\'s experience, a
 significant number of PDFs in the wild, especially those created by
 scanners, are not well-formed files. QPDF makes it more likely that
 OCRmyPDF will succeed, but offers no security guarantees. QPDF is also
 used to split the PDF into single page PDFs.
 
 Finally, OCRmyPDF rasterizes each page of the PDF using
-`Ghostscript <http://ghostscript.com/>`__ in ``-dSAFER`` mode.
+[Ghostscript](http://ghostscript.com/) in `-dSAFER` mode.
 
 Depending on the options specified, OCRmyPDF may graft the OCR layer
-into the existing PDF or it may essentially reconstruct ("re-fry") a
+into the existing PDF or it may essentially reconstruct (\"re-fry\") a
 visually identical PDF that may be quite different at the binary level.
 That said, OCRmyPDF is not a tool designed for sanitizing PDFs.
 
-Password protected PDFs
-=======================
+## Password protected PDFs
 
 Password protected PDFs usually have two passwords, and owner and user
 password. When the user password is set to empty, PDF readers will open
-the file automatically and mark it as "(SECURED)". Password security can
-also request certain restrictions on the PDF, but anyone can remove these
-restrictions if they have either the owner *or* user password. Passwords
-mainly present a barrier for casual users.
+the file automatically and mark it as \"(SECURED)\". Password security
+can also request certain restrictions on the PDF, but anyone can remove
+these restrictions if they have either the owner *or* user password.
+Passwords mainly present a barrier for casual users.
 
 OCRmyPDF cannot remove passwords from PDFs. If you want to remove a
-password from a PDF, you must use other software, such as ``qpdf``.
+password from a PDF, you must use other software, such as `qpdf`.
 
-If the owner and user password are set, a
-password is required for ``qpdf``. If only the owner password is set, then the
-password can be stripped, even if one does not have the owner password. To
-remove the password from a using QPDF, use:
+If the owner and user password are set, a password is required for
+`qpdf`. If only the owner password is set, then the password can be
+stripped, even if one does not have the owner password. To remove the
+password from a using QPDF, use:
 
-.. code-block:: bash
-
-   qpdf --decrypt --password='abc123' input.pdf no_password.pdf
+:::{code} bash
+qpdf --decrypt --password='abc123' input.pdf no_password.pdf
+:::
 
 Then you can run OCRmyPDF on the file.
 
-In its default mode, OCRmyPDF generates PDF/A. Passwords may not be set on PDF/A
-documents. If you want to set a password on the output PDF, you must
-specify ``--output-type pdf``.
+In its default mode, OCRmyPDF generates PDF/A. Passwords may not be set
+on PDF/A documents. If you want to set a password on the output PDF, you
+must specify `--output-type pdf`.
 
-Signature images
-================
+## Signature images
 
-Many programs exist which are capable of inserting an image of someone's
-signature. On its own, this offers no security guarantees. It is trivial
-to remove the signature image and apply it to other files. This practice
-offers no real security.
+Many programs exist which are capable of inserting an image of
+someone\'s signature. On its own, this offers no security guarantees. It
+is trivial to remove the signature image and apply it to other files.
+This practice offers no real security.
 
-Digital signatures
-==================
+## Digital signatures
 
 Important documents can be digitally signed and certified to attest to
 their authorship, approval or execution of a legal agreement. OCRmyPDF
 will detect signed PDFs and will not modify them, unless the
-``--invalidate-digital-signatures`` option is used, which will
-invalidate any signatures. (The signature may still be present in the PDF
-if opened, but PDF readers will not validate it.)
+`--invalidate-digital-signatures` option is used, which will invalidate
+any signatures. (The signature may still be present in the PDF if
+opened, but PDF readers will not validate it.)
 
 A digital signature adds a cryptographic hash of the document to the
 document, so tamper protection is provided. That also precludes OCRmyPDF
@@ -106,20 +97,19 @@ from modifying the document and preserving the signature.
 
 Digital signatures are not the same as a signature image. A digital
 signature is a cryptographic hash of the document that is encrypted with
-the author's private key. The signature is decrypted with the author's
+the author\'s private key. The signature is decrypted with the author\'s
 public key. The public key is usually distributed by a certificate
 authority. The signature is then verified by the PDF reader. If the
 document is modified, the signature will be invalidated.
 
-Certificate-encrypted PDFs
-==========================
+## Certificate-encrypted PDFs
 
 PDFs can be encrypted with a certificate. This is a more secure form of
 encryption than a password. The certificate is usually issued by a
-certificate authority. A certificate is used to encrypt the document using
-the public key for the benefit of a specific recipient who possesses
-the private key.
+certificate authority. A certificate is used to encrypt the document
+using the public key for the benefit of a specific recipient who
+possesses the private key.
 
 OCRmyPDF cannot open certificate-encrypted PDFs. If you have the
-certificate, you can use other PDF software, such as Acrobat, to
-decrypt the PDF.
+certificate, you can use other PDF software, such as Acrobat, to decrypt
+the PDF.

docs/performance.md

@@ -0,0 +1,24 @@
+% SPDX-FileCopyrightText: 2022 James R. Barlow
+% SPDX-License-Identifier: CC-BY-SA-4.0
+
+# Performance
+
+Some users have noticed that current versions of OCRmyPDF do not run as
+quickly as some older versions (specifically 6.x and older). This is
+because OCRmyPDF added image optimization as a postprocessing step, and
+it is enabled by default.
+
+## Speed
+
+If running OCRmyPDF quickly is your main goal, you can use settings such
+as:
+
+-   `--optimize 0` to disable file size optimization
+-   `--output-type pdf` to disable PDF/A generation
+-   `--fast-web-view 999999` to disable fast web view optimization
+-   `--skip-big` to skip large images, if some pages have large images
+
+You can also avoid:
+
+-   `--force-ocr`
+-   Image preprocessing

docs/performance.rst

@@ -1,26 +0,0 @@
-.. SPDX-FileCopyrightText: 2022 James R. Barlow
-..
-.. SPDX-License-Identifier: CC-BY-SA-4.0
-
-===========
-Performance
-===========
-
-Some users have noticed that current versions of OCRmyPDF do not run as quickly
-as some older versions (specifically 6.x and older). This is because OCRmyPDF
-added image optimization as a postprocessing step, and it is enabled by default.
-
-Speed
-=====
-
-If running OCRmyPDF quickly is your main goal, you can use settings such as:
-
-* ``--optimize 0`` to disable file size optimization
-* ``--output-type pdf`` to disable PDF/A generation
-* ``--fast-web-view 999999`` to disable fast web view optimization
-* ``--skip-big`` to skip large images, if some pages have large images
-
-You can also avoid:
-
-* ``--force-ocr``
-* Image preprocessing

docs/plugins.md

@@ -1,15 +1,12 @@
-.. SPDX-FileCopyrightText: 2022 James R. Barlow
-..
-.. SPDX-License-Identifier: CC-BY-SA-4.0
+% SPDX-FileCopyrightText: 2022 James R. Barlow
+% SPDX-License-Identifier: CC-BY-SA-4.0
 
-=======
-Plugins
-=======
+# Plugins
 
-    The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL
-    NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED",  "MAY", and
-    "OPTIONAL" in this document are to be interpreted as described in
-    RFC 2119.
+> The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL
+> NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and
+> "OPTIONAL" in this document are to be interpreted as described in
+> RFC 2119.
 
 You can use plugins to customize the behavior of OCRmyPDF at certain points of
 interest.
@@ -24,75 +21,71 @@ Currently, it is possible to:
 - replace Ghostscript with another PDF to image converter (rasterizer) or
   PDF/A generator
 
-OCRmyPDF plugins are based on the Python ``pluggy`` package and conform to its
+OCRmyPDF plugins are based on the Python `pluggy` package and conform to its
 conventions. Note that: plugins installed with as setuptools entrypoints are
 not checked currently, because OCRmyPDF assumes you may not want to enable
 plugins for all files.
 
-See [OCRmyPDF-EasyOCR](https://github.com/ocrmypdf/OCRmyPDF-EasyOCR) for an
+See \[OCRmyPDF-EasyOCR\](<https://github.com/ocrmypdf/OCRmyPDF-EasyOCR>) for an
 example of a straightforward, fully working plugin.
 
-Script plugins
-==============
+## Script plugins
 
 Script plugins may be called from the command line, by specifying the name of a file.
 Script plugins may be convenient for informal or "one-off" plugins, when a certain
 batch of files needs a special processing step for example.
 
-.. code-block:: bash
+```bash
+ocrmypdf --plugin ocrmypdf_example_plugin.py input.pdf output.pdf
+```
 
-    ocrmypdf --plugin ocrmypdf_example_plugin.py input.pdf output.pdf
+Multiple plugins may be installed by issuing the `--plugin` argument multiple times.
 
-Multiple plugins may be installed by issuing the ``--plugin`` argument multiple times.
-
-Packaged plugins
-================
+## Packaged plugins
 
 Installed plugins may be installed into the same virtual environment as OCRmyPDF
 is installed into. They may be invoked using Python standard module naming.
 If you are intending to distribute a plugin, please package it.
 
-.. code-block:: bash
-
-    ocrmypdf --plugin ocrmypdf_fancypants.pockets.contents input.pdf output.pdf
+```bash
+ocrmypdf --plugin ocrmypdf_fancypants.pockets.contents input.pdf output.pdf
+```
 
 OCRmyPDF does not automatically import plugins, because the assumption is that
 plugins affect different files differently and you may not want them activated
-all the time. The command line or ``ocrmypdf.ocr(plugin='...')`` must call
+all the time. The command line or `ocrmypdf.ocr(plugin='...')` must call
 for them.
 
 Third parties that wish to distribute packages for ocrmypdf should package them
-as packaged plugins, and these modules should begin with the name ``ocrmypdf_``
-similar to ``pytest`` packages such as ``pytest-cov`` (the package) and
-``pytest_cov`` (the module).
+as packaged plugins, and these modules should begin with the name `ocrmypdf_`
+similar to `pytest` packages such as `pytest-cov` (the package) and
+`pytest_cov` (the module).
 
-.. note::
+:::{note}
+We recommend plugin authors name their plugins with the prefix
+`ocrmypdf-` (for the package name on PyPI) and `ocrmypdf_` (for the
+module), just like pytest plugins. At the same time, please make it clear
+that your package is not official.
+:::
 
-    We recommend plugin authors name their plugins with the prefix
-    ``ocrmypdf-`` (for the package name on PyPI) and ``ocrmypdf_`` (for the
-    module), just like pytest plugins. At the same time, please make it clear
-    that your package is not official.
-
-Plugins
-=======
+## Plugins
 
 You can also create a plugin that OCRmyPDF will always automatically load if both are
 installed in the same virtual environment, using a project entrypoint.
 OCRmyPDF uses the entrypoint namespace "ocrmypdf".
 
-For example, ``pyproject.toml`` would need to contain the following, for a plugin named
-``ocrmypdf-exampleplugin``:
+For example, `pyproject.toml` would need to contain the following, for a plugin named
+`ocrmypdf-exampleplugin`:
 
-.. code-block:: toml
+```toml
+[project]
+name = "ocrmypdf-exampleplugin"
 
-    [project]
-    name = "ocrmypdf-exampleplugin"
+[project.entry-points."ocrmypdf"]
+exampleplugin = "exampleplugin.pluginmodule"
+```
 
-    [project.entry-points."ocrmypdf"]
-    exampleplugin = "exampleplugin.pluginmodule"
-
-Plugin requirements
-===================
+## Plugin requirements
 
 OCRmyPDF generally uses multiple worker processes. When a new worker is started,
 Python will import all plugins again, including all plugins that were imported earlier.
@@ -103,14 +96,14 @@ to obtain a reference to shared state prepared by another hook implementation.
 Plugins must expect that other instances of the plugin will be running
 simultaneously.
 
-The ``context`` object that is passed to many hooks can be used to share information
+The `context` object that is passed to many hooks can be used to share information
 about a file being worked on. Plugins must write private, plugin-specific data to
-a subfolder named ``{options.work_folder}/ocrmypdf-plugin-name``. Plugins MAY
-read and write files in ``options.work_folder``, but should be aware that their
+a subfolder named `{options.work_folder}/ocrmypdf-plugin-name`. Plugins MAY
+read and write files in `options.work_folder`, but should be aware that their
 semantics are subject to change.
 
-OCRmyPDF will delete ``options.work_folder`` when it has finished OCRing
-a file, unless invoked with ``--keep-temporary-files``.
+OCRmyPDF will delete `options.work_folder` when it has finished OCRing
+a file, unless invoked with `--keep-temporary-files`.
 
 The documentation for some plugin hooks contain a detailed description of the
 execution context in which they will be called.
@@ -119,114 +112,139 @@ Plugins should be prepared to work whether executed in worker threads or worker
 processes. Generally, OCRmyPDF uses processes, but has a semi-hidden threaded
 argument that simplifies debugging.
 
-
-Plugin hooks
-============
+## Plugin hooks
 
 A plugin may provide the following hooks. Hooks must be decorated with
-``ocrmypdf.hookimpl``, for example:
+`ocrmypdf.hookimpl`, for example:
 
-.. code-block:: python
+```python
+from ocrmpydf import hookimpl
 
-    from ocrmpydf import hookimpl
-
-    @hookimpl
-    def add_options(parser):
-        pass
+@hookimpl
+def add_options(parser):
+    pass
+```
 
 The following is a complete list of hooks that are available, and when
 they are called.
 
-.. _firstresult:
+(firstresult)=
 
 **Note on firstresult hooks**
 
 If multiple plugins install implementations for this hook, they will be called in
 the reverse of the order in which they are installed (i.e., last plugin wins).
 When each hook implementation is called in order, the first implementation that
-returns a value other than ``None`` will "win" and prevent execution of all other
+returns a value other than `None` will "win" and prevent execution of all other
 hooks. As such, you cannot "chain" a series of plugin filters together in this
 way. Instead, a single hook implementation should be responsible for any such
 chaining operations.
 
-Examples
-========
+## Examples
 
-* OCRmyPDF's test suite contains several plugins that are used to simulate certain
+- OCRmyPDF's test suite contains several plugins that are used to simulate certain
   test conditions.
-* `ocrmypdf-papermerge <https://github.com/papermerge/OCRmyPDF_papermerge>`_ is
+- [ocrmypdf-papermerge](https://github.com/papermerge/OCRmyPDF_papermerge) is
   a production plugin that integrates OCRmyPDF and the Papermerge document
   management system.
 
+### Suppressing or overriding other plugins
 
-Suppressing or overriding other plugins
----------------------------------------
-
+```{eval-rst}
 .. autofunction:: ocrmypdf.pluginspec.initialize
+```
 
-Custom command line arguments
------------------------------
+### Custom command line arguments
 
+```{eval-rst}
 .. autofunction:: ocrmypdf.pluginspec.add_options
+```
 
+```{eval-rst}
 .. autofunction:: ocrmypdf.pluginspec.check_options
+```
 
-Execution and progress reporting
---------------------------------
+### Execution and progress reporting
 
+```{eval-rst}
 .. autoclass:: ocrmypdf.pluginspec.ProgressBar
     :members:
     :special-members: __init__, __enter__, __exit__
+```
 
+```{eval-rst}
 .. autoclass:: ocrmypdf.pluginspec.Executor
     :members:
     :special-members: __call__
+```
 
+```{eval-rst}
 .. autofunction:: ocrmypdf.pluginspec.get_logging_console
+```
 
+```{eval-rst}
 .. autofunction:: ocrmypdf.pluginspec.get_executor
+```
 
+```{eval-rst}
 .. autofunction:: ocrmypdf.pluginspec.get_progressbar_class
+```
 
-Applying special behavior before processing
--------------------------------------------
+### Applying special behavior before processing
 
+```{eval-rst}
 .. autofunction:: ocrmypdf.pluginspec.validate
+```
 
-PDF page to image
------------------
+### PDF page to image
 
+```{eval-rst}
 .. autofunction:: ocrmypdf.pluginspec.rasterize_pdf_page
+```
 
-Modifying intermediate images
------------------------------
+### Modifying intermediate images
 
+```{eval-rst}
 .. autofunction:: ocrmypdf.pluginspec.filter_ocr_image
+```
 
+```{eval-rst}
 .. autofunction:: ocrmypdf.pluginspec.filter_page_image
+```
 
+```{eval-rst}
 .. autofunction:: ocrmypdf.pluginspec.filter_pdf_page
+```
 
-OCR engine
-----------
+### OCR engine
 
+```{eval-rst}
 .. autofunction:: ocrmypdf.pluginspec.get_ocr_engine
+```
 
+```{eval-rst}
 .. autoclass:: ocrmypdf.pluginspec.OcrEngine
     :members:
 
     .. automethod:: __str__
+```
 
+```{eval-rst}
 .. autoclass:: ocrmypdf.pluginspec.OrientationConfidence
+```
 
-PDF/A production
-----------------
+### PDF/A production
 
+```{eval-rst}
 .. autofunction:: ocrmypdf.pluginspec.generate_pdfa
+```
 
-PDF optimization
-----------------
+### PDF optimization
 
+```{eval-rst}
 .. autofunction:: ocrmypdf.pluginspec.optimize_pdf
+```
 
-.. autofunction:: ocrmypdf.pluginspec.is_optimization_enabled
+```{eval-rst}
+.. autofunction:: ocrmypdf.pluginspec.is_optimization_enabled
+```

misc/_webservice.py

@@ -0,0 +1,239 @@
+# SPDX-FileCopyrightText: 2025 James R. Barlow
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+"""This is a simple web service/HTTP wrapper for OCRmyPDF.
+
+This may be more convenient than the command line tool for some Docker users.
+Note that OCRmyPDF uses Ghostscript, which is licensed under AGPLv3+. While
+OCRmyPDF is under GPLv3, this file is distributed under the Affero GPLv3+ license,
+to emphasize that SaaS deployments should make sure they comply with
+Ghostscript's license as well as OCRmyPDF's.
+"""
+
+from __future__ import annotations
+
+import os
+import subprocess
+import sys
+from functools import partial
+from operator import getitem
+from pathlib import Path
+from tempfile import NamedTemporaryFile
+
+import pikepdf
+import streamlit as st
+
+from ocrmypdf._defaults import DEFAULT_ROTATE_PAGES_THRESHOLD
+
+
+def get_host_url_with_port(port: int) -> str:
+    """Get the host URL for the web service. Hacky."""
+    host_url = st.context.headers["host"]
+    try:
+        host, _streamlit_port = host_url.split(":", maxsplit=1)
+    except ValueError:
+        host = host_url
+    return f"//{host}:{port}"  # Use the same protocol
+
+
+st.title("OCRmyPDF Web Service")
+
+uploaded = st.file_uploader("Upload input PDF or image", type=["pdf"], key="file")
+
+mode = st.selectbox("Mode", options=["normal", "skip-text", "force-ocr", "redo-ocr"])
+
+pages = st.text_input(
+    "Pages", value="", help="Comma-separated list of pages to process"
+)
+
+with st.expander("Input options"):
+    invalidate_digital_signatures = st.checkbox(
+        "Invalidate digital signatures", value=False
+    )
+    language = st.selectbox("Language", options=["eng", "deu", "fra", "spa"])
+
+    image_dpi = st.slider(
+        "Image DPI", value=300, key="image_dpi", min_value=1, max_value=5000, step=50
+    )
+with st.expander("Preprocessing"):
+    skip_big = st.checkbox("Skip OCR on big pages", value=False, key="skip_big")
+    oversample = st.slider("Oversample", min_value=0, max_value=5000, value=0, step=50)
+    rotate_pages = st.checkbox("Rotate pages", value=False, key="rotate")
+    deskew = st.checkbox("Deskew pages", value=False, key="deskew")
+    clean = st.checkbox("Clean pages before OCR", value=False, key="clean")
+    clean_final = st.checkbox("Clean final", value=False, key="clean_final")
+    remove_vectors = st.checkbox("Remove vectors", value=False, key="remove_vectors")
+
+
+with st.expander("Output options"):
+    output_type = st.selectbox(
+        "Output type", options=["pdfa", "pdf", "pdfa-1", "pdfa-2", "pdfa-3", "none"]
+    )
+
+    pdf_renderer = st.selectbox(
+        "PDF renderer", options=["auto", "hocr", "hocrdebug", "sandwich"]
+    )
+
+    optimize = st.selectbox("Optimize", options=["0", "1", "2", "3"])
+
+    st.selectbox("PDF/A compression", options=["auto", "jpeg", "lossless"])
+
+with st.expander("Metadata"):
+    title = author = keywords = subject = None
+    if uploaded:
+        with pikepdf.open(uploaded) as pdf, pdf.open_metadata() as meta:
+            st.code(str(meta), language="xml")
+            title = st.text_input("Title", value=meta.get('dc:title', ''))
+            author = st.text_input("Author", value=meta.get('dc:creator', ''))
+            keywords = st.text_input("Keywords", value=meta.get('dc:subject', ''))
+            subject = st.text_input("Subject", value=meta.get('dc:description', ''))
+
+
+with st.expander("Optimization after OCR"):
+    jpeg_quality = st.slider(
+        "JPEG quality", min_value=0, max_value=100, value=75, key="jpeg_quality"
+    )
+    png_quality = st.slider(
+        "PNG quality", min_value=0, max_value=100, value=75, key="png_quality"
+    )
+    jbig2_lossy = st.checkbox("JBIG2 lossy (dangerous)", value=False, key="jbig2_lossy")
+    jbig2_threshold = st.number_input("JBIG2 threshold", value=0, key="jbig2_threshold")
+
+with st.expander("Advanced options"):
+    jobs = st.slider(
+        "Threads",
+        min_value=1,
+        max_value=os.cpu_count(),
+        value=os.cpu_count(),
+        key="threads",
+    )
+    max_image_mpixels = st.number_input(
+        "Max image size",
+        value=250.0,
+        min_value=0.0,
+        help="Maximum image size in megapixels",
+    )
+    rotate_pages_threshold = st.number_input(
+        "Rotate pages threshold",
+        value=DEFAULT_ROTATE_PAGES_THRESHOLD,
+        min_value=0.0,
+        max_value=1000.0,
+        help="Threshold for automatic page rotation",
+    )
+    fast_web_view = st.number_input(
+        "Fast web view",
+        value=1.0,
+        min_value=0.0,
+        help="Linearize files above this size in MB",
+    )
+    continue_on_soft_render_error = st.checkbox(
+        "Continue on soft render error", value=True
+    )
+    verbose_labels = ["quiet", "default", "debug", "debug_all"]
+    verbose = st.selectbox(
+        "Verbosity level",
+        options=[-1, 0, 1, 2],
+        index=1,
+        format_func=partial(getitem, verbose_labels),
+    )
+
+if uploaded:
+    args = []
+    if mode and mode != 'normal':
+        args.append(f"--{mode}")
+    if language:
+        args.append(f"--language={language}")
+    if not uploaded.name.lower().endswith(".pdf") and image_dpi:
+        args.append(f"--image-dpi={image_dpi}")
+    if skip_big:
+        args.append("--skip-big")
+    if oversample:
+        args.append(f"--oversample={oversample}")
+    if rotate_pages:
+        args.append("--rotate-pages")
+    if deskew:
+        args.append("--deskew")
+    if clean:
+        args.append("--clean")
+    if clean_final:
+        args.append("--clean-final")
+    if remove_vectors:
+        args.append("--remove-vectors")
+    if output_type:
+        args.append(f"--output-type={output_type}")
+    if pdf_renderer:
+        args.append(f"--pdf-renderer={pdf_renderer}")
+    if optimize:
+        args.append(f"--optimize={optimize}")
+    if title:
+        args.append(f"--title={title}")
+    if author:
+        args.append(f"--author={author}")
+    if keywords:
+        args.append(f"--keywords={keywords}")
+    if subject:
+        args.append(f"--subject={subject}")
+    if pages:
+        args.append(f"--pages={pages}")
+    if max_image_mpixels:
+        args.append(f"--max-image-mpixels={max_image_mpixels}")
+    if rotate_pages_threshold:
+        args.append(f"--rotate-pages-threshold={rotate_pages_threshold}")
+    if fast_web_view:
+        args.append(f"--fast-web-view={fast_web_view}")
+    if continue_on_soft_render_error:
+        args.append("--continue-on-soft-render-error")
+    if verbose:
+        args.append(f"--verbose={verbose}")
+    if optimize > '0' and jpeg_quality:
+        args.append(f"--jpeg-quality={jpeg_quality}")
+    if optimize > '0' and png_quality:
+        args.append(f"--png-quality={png_quality}")
+    if jbig2_lossy:
+        args.append("--jbig2-lossy")
+    if jbig2_threshold:
+        args.append(f"--jbig2-threshold={jbig2_threshold}")
+    if jobs:
+        args.append(f"--jobs={jobs}")
+    input_file = NamedTemporaryFile(delete=True, suffix=f"_{uploaded.name}")
+    input_file.write(uploaded.getvalue())
+    input_file.flush()
+    input_file.seek(0)
+    args.append(str(input_file.name))
+    output_file = NamedTemporaryFile(delete=True, suffix=".pdf")
+    args.append(str(output_file.name))
+
+    st.session_state['running'] = (
+        'run_button' in st.session_state and st.session_state.run_button
+    )
+    if st.button(
+        "Run OCRmyPDF",
+        disabled=st.session_state.get("running", False),
+        key='run_button',
+    ):
+        st.session_state['running'] = True
+        args = [sys.executable, '-u', '-m', "ocrmypdf"] + args
+
+        proc = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        with st.container(border=True):
+            while proc.poll() is None:
+                line = proc.stderr.readline()
+                if line:
+                    st.html("<code>" + line.decode().strip() + "</code>")
+
+        if proc.returncode != 0:
+            st.error(f"ocrmypdf failed with exit code {proc.returncode}")
+            st.session_state['running'] = False
+            st.stop()
+
+        if Path(output_file.name).stat().st_size == 0:
+            st.error("No output PDF file was generated")
+            st.stop()
+
+        st.download_button(
+            label="Download output PDF",
+            data=output_file.read(),
+            file_name=uploaded.name,
+            mime="application/pdf",
+        )
+        st.session_state['running'] = False

misc/bisect_pdf.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python3
+# SPDX-FileCopyrightText: 2024 James R. Barlow
+# SPDX-License-Identifier: MIT
+
+"""Helper script for bisecting PDFs to find a page with an issue."""
+
+import sys
+
+import pikepdf
+
+if len(sys.argv) != 2:
+    print(f"Usage: {sys.argv[0]} <input.pdf>")
+    sys.exit(1)
+
+with pikepdf.open(sys.argv[1]) as pdf:
+    num_pages = len(pdf.pages)
+    low = 0
+    high = num_pages - 1
+    while low <= high:
+        mid = (low + high) // 2
+        with pikepdf.new() as new_pdf:
+            new_pdf.pages.extend(pdf.pages[low : mid + 1])
+            new_pdf.save(f"bisect-issue-{low + 1}-{mid + 1}.pdf")
+        print(f"Is bisect-issue-{low + 1}-{mid + 1}.pdf good or bad?", end=" ")
+        while True:
+            response = input().lower()
+            if response == "good":
+                low = mid + 1
+                break
+            elif response == "bad":
+                high = mid - 1
+                break
+            else:
+                print("Please respond with 'good' or 'bad'.")
+    print(f"The issue is on page {low + 1} of the original PDF.")
+    with pikepdf.new() as new_pdf:
+        new_pdf.pages.extend(pdf.pages[low])
+        new_pdf.save(f"bisect-issue-bad-{low + 1}.pdf")
+    with pikepdf.new() as new_pdf:
+        new_pdf.pages.extend(pdf.pages[:low])
+        new_pdf.pages.extend(pdf.pages[low + 1 :])
+        new_pdf.save(f"bisect-issue-good-{low + 1}.pdf")

misc/ocrmypdf_compare.py

@@ -0,0 +1,128 @@
+# SPDX-FileCopyrightText: 2025 James R. Barlow
+# SPDX-License-Identifier: MIT
+
+"""Run OCRmyPDF on the same PDF with different options."""
+
+from __future__ import annotations
+
+import os
+import shlex
+from io import BytesIO
+from pathlib import Path
+from subprocess import check_output, run
+from tempfile import TemporaryDirectory
+
+import pikepdf
+import pymupdf
+import streamlit as st
+from lxml import etree
+from streamlit_pdf_viewer import pdf_viewer
+
+
+def do_column(label, suffix, d):
+    cli = st.text_area(
+        f"Command line arguments for {label}",
+        key=f"args{suffix}",
+        value="ocrmypdf {in_} {out}",
+    )
+    env_text = st.text_area(f"Environment variables for {label}", key=f"env{suffix}")
+    env = os.environ.copy()
+    for line in env_text.splitlines():
+        if line:
+            try:
+                k, v = line.split("=", 1)
+            except ValueError:
+                st.error(f"Invalid environment variable: {line}")
+                break
+            env[k] = v
+    args = shlex.split(
+        cli.format(
+            in_=os.path.join(d, "input.pdf"),
+            out=os.path.join(d, f"output{suffix}.pdf"),
+        )
+    )
+    with st.expander("Environment variables", expanded=bool(env_text.strip())):
+        st.code('\n'.join(f"{k}={v}" for k, v in env.items()))
+    st.code(shlex.join(args))
+    return env, args
+
+
+def main():
+    st.set_page_config(layout="wide")
+
+    st.title("OCRmyPDF Compare")
+    st.write("Run OCRmyPDF on the same PDF with different options.")
+    st.warning("This is a testing tool and is not intended for production use.")
+
+    uploaded_pdf = st.file_uploader("Upload a PDF", type=["pdf"])
+    if uploaded_pdf is None:
+        return
+
+    pdf_bytes = uploaded_pdf.read()
+
+    with pikepdf.open(BytesIO(pdf_bytes)) as p, TemporaryDirectory() as d:
+        with st.expander("PDF Metadata"):
+            with p.open_metadata() as meta:
+                xml_txt = str(meta)
+                parser = etree.XMLParser(remove_blank_text=True)
+                tree = etree.fromstring(xml_txt, parser=parser)
+                st.code(
+                    etree.tostring(tree, pretty_print=True).decode("utf-8"),
+                    language="xml",
+                )
+            st.write(p.docinfo)
+            st.write("Number of pages:", len(p.pages))
+
+        col1, col2 = st.columns(2)
+        with col1:
+            env1, args1 = do_column("A", "1", d)
+        with col2:
+            env2, args2 = do_column("B", "2", d)
+
+        if not st.button("Execute and Compare"):
+            return
+        with st.spinner("Executing..."):
+            Path(d, "input.pdf").write_bytes(pdf_bytes)
+            run(args1, env=env1)
+            run(args2, env=env2)
+
+            col1, col2 = st.columns(2)
+            with col1:
+                st.text(
+                    "Ghostscript version A: "
+                    + check_output(
+                        ["gs", "--version"],
+                        env=env1,
+                        text=True,
+                    )
+                )
+            with col2:
+                st.text(
+                    "Ghostscript version B: "
+                    + check_output(
+                        ["gs", "--version"],
+                        env=env2,
+                        text=True,
+                    )
+                )
+
+            doc1 = pymupdf.open(os.path.join(d, "output1.pdf"))
+            doc2 = pymupdf.open(os.path.join(d, "output2.pdf"))
+            for i, page1_2 in enumerate(zip(doc1, doc2)):
+                st.write(f"Page {i+1}")
+                page1, page2 = page1_2
+                col1, col2 = st.columns(2)
+                with col1, st.container(border=True):
+                    st.write(page1.get_text())
+                with col2, st.container(border=True):
+                    st.write(page2.get_text())
+
+            col1, col2 = st.columns(2)
+            with col1, st.expander("PDF Viewer"):
+                pdf_viewer(Path(d, "output1.pdf"))
+            with col2, st.expander("PDF Viewer"):
+                pdf_viewer(Path(d, "output2.pdf"))
+
+
+if __name__ == "__main__":
+    main()

misc/pdf_compare.py

@@ -0,0 +1,83 @@
+# SPDX-FileCopyrightText: 2025 James R. Barlow
+# SPDX-License-Identifier: MIT
+
+"""Compare two PDFs."""
+
+from __future__ import annotations
+
+import os
+from io import BytesIO
+from pathlib import Path
+from tempfile import TemporaryDirectory
+
+import pikepdf
+import pymupdf
+import streamlit as st
+from lxml import etree
+from streamlit_pdf_viewer import pdf_viewer
+
+
+def do_metadata(pdf):
+    with pikepdf.open(pdf) as pdf:
+        with pdf.open_metadata() as meta:
+            xml_txt = str(meta)
+            parser = etree.XMLParser(remove_blank_text=True)
+            tree = etree.fromstring(xml_txt, parser=parser)
+            st.code(
+                etree.tostring(tree, pretty_print=True).decode("utf-8"),
+                language="xml",
+            )
+        st.write(pdf.docinfo)
+        st.write("Number of pages:", len(pdf.pages))
+
+
+def main():
+    st.set_page_config(layout="wide")
+
+    st.title("PDF Compare")
+    st.write("Compare two PDFs.")
+
+    col1, col2 = st.columns(2)
+    with col1:
+        uploaded_pdf1 = st.file_uploader("Upload a PDF", type=["pdf"], key='pdf1')
+    with col2:
+        uploaded_pdf2 = st.file_uploader("Upload a PDF", type=["pdf"], key='pdf2')
+    if uploaded_pdf1 is None or uploaded_pdf2 is None:
+        return
+
+    pdf_bytes1 = uploaded_pdf1.getvalue()
+    pdf_bytes2 = uploaded_pdf2.getvalue()
+
+    with st.expander("PDF Metadata"):
+        col1, col2 = st.columns(2)
+        with col1:
+            do_metadata(BytesIO(pdf_bytes1))
+        with col2:
+            do_metadata(BytesIO(pdf_bytes2))
+
+    with TemporaryDirectory() as d:
+        Path(d, "1.pdf").write_bytes(pdf_bytes1)
+        Path(d, "2.pdf").write_bytes(pdf_bytes2)
+
+        with st.expander("Text"):
+            doc1 = pymupdf.open(os.path.join(d, "1.pdf"))
+            doc2 = pymupdf.open(os.path.join(d, "2.pdf"))
+            for i, page1_2 in enumerate(zip(doc1, doc2)):
+                st.write(f"Page {i+1}")
+                page1, page2 = page1_2
+                col1, col2 = st.columns(2)
+                with col1, st.container(border=True):
+                    st.write(page1.get_text())
+                with col2, st.container(border=True):
+                    st.write(page2.get_text())
+
+        with st.expander("PDF Viewer"):
+            col1, col2 = st.columns(2)
+            with col1:
+                pdf_viewer(Path(d, "1.pdf"), key='pdf_viewer1', render_text=True)
+            with col2:
+                pdf_viewer(Path(d, "2.pdf"), key='pdf_viewer2', render_text=True)
+
+
+if __name__ == "__main__":
+    main()

misc/pdf_text_diff.py

@@ -0,0 +1,46 @@
+# SPDX-FileCopyrightText: 2025 James R. Barlow
+# SPDX-License-Identifier: MPL-2.0
+
+"""Compare text in PDFs."""
+
+from __future__ import annotations
+
+from subprocess import run
+from tempfile import NamedTemporaryFile
+from typing import Annotated
+
+import typer
+
+
+def main(
+    pdf1: Annotated[typer.FileBinaryRead, typer.Argument()],
+    pdf2: Annotated[typer.FileBinaryRead, typer.Argument()],
+    engine: Annotated[str, typer.Option()] = 'pdftotext',
+):
+    """Compare text in PDFs."""
+
+    text1 = run(
+        ['pdftotext', '-layout', '-', '-'], stdin=pdf1, capture_output=True, check=True
+    )
+    text2 = run(
+        ['pdftotext', '-layout', '-', '-'], stdin=pdf2, capture_output=True, check=True
+    )
+
+    with NamedTemporaryFile() as f1, NamedTemporaryFile() as f2:
+        f1.write(text1.stdout)
+        f1.flush()
+        f2.write(text2.stdout)
+        f2.flush()
+        diff = run(
+            ['diff', '--color=always', '--side-by-side', f1.name, f2.name],
+            capture_output=True,
+        )
+        run(['less', '-R'], input=diff.stdout, check=True)
+        if text1.stdout.strip() != text2.stdout.strip():
+            return 1
+
+    return 0
+
+
+if __name__ == '__main__':
+    typer.run(main)

misc/webservice.py

@@ -1,107 +1,29 @@
-#!/usr/bin/env python3
-# SPDX-FileCopyrightText: 2019 James R. Barlow
+#!/usr/bin/env python
+# SPDX-FileCopyrightText: 2025 James R. Barlow
 # SPDX-License-Identifier: AGPL-3.0-or-later
 
-"""This is a simple web service/HTTP wrapper for OCRmyPDF.
-
-This may be more convenient than the command line tool for some Docker users.
-Note that OCRmyPDF uses Ghostscript, which is licensed under AGPLv3+. While
-OCRmyPDF is under GPLv3, this file is distributed under the Affero GPLv3+ license,
-to emphasize that SaaS deployments should make sure they comply with
-Ghostscript's license as well as OCRmyPDF's.
-"""
-
-from __future__ import annotations
+"""Run the OCRmyPDF web service."""
 
 import os
-import shlex
-from subprocess import run
-from tempfile import TemporaryDirectory
+import sys
 
-from flask import Flask, Response, request, send_from_directory
-from werkzeug.utils import secure_filename
+try:
+    import streamlit  # noqa: F401
+except ImportError:
+    raise ImportError(
+        'You need to install streamlit in the Python environment '
+        'to run the web service.\n'
+    )
 
-app = Flask(__name__)
-app.secret_key = "secret"
-app.config['MAX_CONTENT_LENGTH'] = 50_000_000
-app.config.from_envvar("OCRMYPDF_WEBSERVICE_SETTINGS", silent=True)
-
-ALLOWED_EXTENSIONS = {"pdf"}
-
-
-def allowed_file(filename):
-    return "." in filename and filename.rsplit(".", 1)[1].lower() in ALLOWED_EXTENSIONS
-
-
-def do_ocrmypdf(file):
-    uploaddir = TemporaryDirectory(prefix="ocrmypdf-upload")
-    downloaddir = TemporaryDirectory(prefix="ocrmypdf-download")
-
-    filename = secure_filename(file.filename)
-    up_file = os.path.join(uploaddir.name, filename)
-    file.save(up_file)
-
-    down_file = os.path.join(downloaddir.name, filename)
-
-    cmd_args = [arg for arg in shlex.split(request.form["params"])]
-    if "--sidecar" in cmd_args:
-        return Response("--sidecar not supported", 501, mimetype='text/plain')
-
-    ocrmypdf_args = ["ocrmypdf", *cmd_args, up_file, down_file]
-    proc = run(ocrmypdf_args, capture_output=True, encoding="utf-8", check=False)
-    if proc.returncode != 0:
-        stderr = proc.stderr
-        return Response(stderr, 400, mimetype='text/plain')
-
-    return send_from_directory(downloaddir.name, filename)
-
-
-@app.route("/", methods=["GET", "POST"])
-def upload_file():
-    if request.method == "POST":
-        if "file" not in request.files:
-            return Response("No file in POST", 400, mimetype='text/plain')
-        file = request.files["file"]
-        if file.filename == "":
-            return Response("Empty filename", 400, mimetype='text/plain')
-        if not allowed_file(file.filename):
-            return Response("Invalid filename", 400, mimetype='text/plain')
-        if file and allowed_file(file.filename):
-            return do_ocrmypdf(file)
-        return Response("Some other problem", 400, mimetype='text/plain')
-
-    return """
-    <!doctype html>
-    <title>OCRmyPDF webservice</title>
-    <h1>Upload a PDF (debug UI)</h1>
-    <form method=post enctype=multipart/form-data>
-      <label for="args">Command line parameters</label>
-      <input type=textbox name=params>
-      <label for="file">File to upload</label>
-      <input type=file name=file>
-      <input type=submit value=Upload>
-    </form>
-    <h4>Notice</h2>
-    <div style="font-size: 70%; max-width: 34em;">
-    <p>This is a webservice wrapper for OCRmyPDF.</p>
-    <p>Copyright 2019 James R. Barlow</p>
-    <p>This program is free software: you can redistribute it and/or modify
-    it under the terms of the GNU Affero General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-    </p>
-    <p>This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-    </p>
-    <p>
-    You should have received a copy of the GNU Affero General Public License
-    along with this program.  If not, see &lt;http://www.gnu.org/licenses/&gt;.
-    </p>
-    </div>
-    """
-
-
-if __name__ == "__main__":
-    app.run(host='0.0.0.0', port=5000)
+if __name__ == '__main__':
+    os.execvp(
+        sys.executable,
+        [
+            sys.executable,
+            '-m',
+            'streamlit',
+            'run',
+            'misc/_webservice.py',
+            *sys.argv[1:],
+        ],
+    )

pyproject.toml

@@ -9,7 +9,7 @@ name = "ocrmypdf"
 dynamic = ["version"]
 description = "OCRmyPDF adds an OCR text layer to scanned PDF files, allowing them to be searched"
 readme = "README.md"
-license = { text = "MPL-2.0" }
+license = "MPL-2.0"
 requires-python = ">=3.10"
 dependencies = [
   "deprecation>=2.1.0",
@@ -29,7 +29,6 @@ classifiers = [
   "Intended Audience :: End Users/Desktop",
   "Intended Audience :: Science/Research",
   "Intended Audience :: System Administrators",
-  "License :: OSI Approved :: Mozilla Public License 2.0 (MPL 2.0)",
   "Operating System :: MacOS",
   "Operating System :: Microsoft :: Windows",
   "Operating System :: POSIX",
@@ -49,7 +48,12 @@ Tracker = "https://github.com/ocrmypdf/OCRmyPDF/issues"
 Changelog = "https://github.com/ocrmypdf/OCRmyPDF/docs/release_notes.rst"
 
 [project.optional-dependencies]
-docs = ["sphinx", "sphinx-issues", "sphinx-rtd-theme"]
+docs = [
+    "myst-parser>=4.0.1",
+    "sphinx",
+ "sphinx-issues",
+ "sphinx-rtd-theme",
+]
 extended_test = ["PyMuPDF>=1.19.1"]
 test = [
   "coverage[toml]>=6.2",
@@ -63,7 +67,7 @@ test = [
   "types-humanfriendly",
 ]
 watcher = ["watchdog>=1.0.2", "typer-slim[standard]", "python-dotenv"]
-webservice = ["Flask>=2.0.1"]
+webservice = ["streamlit>=1.41.0"]
 
 [project.scripts]
 ocrmypdf = "ocrmypdf.__main__:run"
@@ -118,8 +122,6 @@ filterwarnings = [
 [[tool.mypy.overrides]]
 module = [
   'pluggy',
-  'tqdm',
-  'coloredlogs',
   'img2pdf',
   'pdfminer.*',
   'reportlab.*',
@@ -155,3 +157,12 @@ convention = "google"
 
 [tool.ruff.format]
 quote-style = "preserve"
+
+[dependency-groups]
+dev = [
+  "mypy>=1.13.0",
+  "pymupdf>=1.24.14",
+  "streamlit-pdf-viewer>=0.0.19",
+  "streamlit>=1.40.2",
+  "ipykernel>=6.29.5",
+]

src/ocrmypdf/_annots.py

@@ -0,0 +1,66 @@
+# SPDX-FileCopyrightText: 2024 James R. Barlow
+# SPDX-License-Identifier: MPL-2.0
+
+"""OCRmyPDF PDF annotation cleanup."""
+
+from __future__ import annotations
+
+import logging
+
+from pikepdf import Dictionary, Name, NameTree, Pdf
+
+log = logging.getLogger(__name__)
+
+
+def remove_broken_goto_annotations(pdf: Pdf) -> bool:
+    """Remove broken goto annotations from a PDF.
+
+    If a PDF contains a GoTo Action that points to a named destination that does not
+    exist, Ghostscript PDF/A conversion will fail. In any event, a named destination
+    that is not defined is not useful.
+
+    Args:
+        pdf: Opened PDF file.
+
+    Returns:
+        bool: True if the file was modified, False if not.
+    """
+    modified = False
+
+    # Check if there are any named destinations
+    if Name.Names not in pdf.Root:
+        return modified
+    if Name.Dests not in pdf.Root[Name.Names]:
+        return modified
+
+    dests = pdf.Root[Name.Names][Name.Dests]
+    if not isinstance(dests, Dictionary):
+        return modified
+    nametree = NameTree(dests)
+
+    # Create a set of all named destinations
+    names = set(k for k in nametree.keys())
+
+    for n, page in enumerate(pdf.pages):
+        if Name.Annots not in page:
+            continue
+        for annot in page[Name.Annots]:
+            if not isinstance(annot, Dictionary):
+                continue
+            if Name.A not in annot or Name.D not in annot[Name.A]:
+                continue
+            # We found an annotation that points to a named destination
+            named_destination = str(annot[Name.A][Name.D])
+            if named_destination not in names:
+                # If there is no corresponding named destination, remove the
+                # annotation. Having no destination set is still valid and just
+                # makes the link non-functional.
+                log.warning(
+                    f"Disabling a hyperlink annotation on page {n + 1} to a "
+                    "non-existent named destination "
+                    f"{named_destination}."
+                )
+                del annot[Name.A][Name.D]
+                modified = True
+
+    return modified

src/ocrmypdf/_exec/ghostscript.py

@@ -17,7 +17,11 @@ from subprocess import PIPE, CalledProcessError
 from packaging.version import Version
 from PIL import Image, UnidentifiedImageError
 
-from ocrmypdf.exceptions import ColorConversionNeededError, SubprocessOutputError
+from ocrmypdf.exceptions import (
+    ColorConversionNeededError,
+    InputFileError,
+    SubprocessOutputError,
+)
 from ocrmypdf.helpers import Resolution
 from ocrmypdf.subprocess import get_version, run, run_polling_stderr
 
@@ -111,7 +115,6 @@ def rasterize_pdf(
     args_gs = (
         [
             GS,
-            '-dQUIET',
             '-dSAFER',
             '-dBATCH',
             '-dNOPAUSE',
@@ -125,7 +128,7 @@ def rasterize_pdf(
         + (['-dPDFSTOPONERROR'] if stop_on_error else [])
         + [
             '-o',
-            '-',
+            fspath(output_file),
             '-sstdout=%stderr',  # Literal %s, not string interpolation
             '-dAutoRotatePages=/None',  # Probably has no effect on raster
             '-f',
@@ -137,14 +140,23 @@ def rasterize_pdf(
         p = run(args_gs, stdout=PIPE, stderr=PIPE, check=True)
     except CalledProcessError as e:
         log.error(e.stderr.decode(errors='replace'))
-        raise SubprocessOutputError('Ghostscript rasterizing failed') from e
-    else:
-        stderr = p.stderr.decode(errors='replace')
-        if _gs_error_reported(stderr):
-            log.error(stderr)
+        Path(output_file).unlink(missing_ok=True)
+        raise SubprocessOutputError("Ghostscript rasterizing failed") from e
+
+    stderr = p.stderr.decode(errors='replace')
+    if _gs_error_reported(stderr):
+        log.error(stderr)
+        if stop_on_error and "recoverable image error" in stderr:
+            Path(output_file).unlink(missing_ok=True)
+            raise InputFileError(
+                "Ghostscript rasterizing failed. The input file contains errors that "
+                "cause PDF viewers to interpret it differently and incorrectly. "
+                "Try using --continue-on-soft-render-error and manually inspect the "
+                "input and output files to check for visual differences or errors."
+            )
 
     try:
-        with Image.open(BytesIO(p.stdout)) as im:
+        with Image.open(output_file) as im:
             if rotation is not None:
                 log.debug("Rotating output by %i", rotation)
                 # rotation is a clockwise angle and Image.ROTATE_* is
@@ -157,13 +169,19 @@ def rasterize_pdf(
                     im = im.transpose(Image.Transpose.ROTATE_270)
                 if rotation % 180 == 90:
                     page_dpi = page_dpi.flip_axis()
-            im.save(fspath(output_file), dpi=page_dpi)
+            im.save(output_file, dpi=page_dpi)
     except UnidentifiedImageError:
         log.error(
             f"Ghostscript (using {raster_device} at {raster_dpi} dpi) produced "
             "an invalid page image file."
         )
         raise
+    except OSError as e:
+        log.error(
+            f"Ghostscript (using {raster_device} at {raster_dpi} dpi) produced "
+            "an invalid page image file."
+        )
+        raise UnidentifiedImageError() from e
 
 
 class GhostscriptFollower:
@@ -271,19 +289,15 @@ def generate_pdfa(
             f"-dPDFA={pdfa_part}",
             "-dPDFACompatibilityPolicy=1",
             "-o",
-            "-",
+            fspath(output_file),
             "-sstdout=%stderr",  # Literal %s, not string interpolation
         ]
     )
     args_gs.extend(fspath(s) for s in pdf_pages)  # Stringify Path objs
     try:
-        with (
-            Path(output_file).open('wb') as output,
-            GhostscriptFollower(progressbar_class) as pbar,
-        ):
+        with GhostscriptFollower(progressbar_class) as pbar:
             p = run_polling_stderr(
                 args_gs,
-                stdout=output,
                 stderr=PIPE,
                 check=True,
                 text=True,

src/ocrmypdf/_exec/unpaper.py

@@ -48,7 +48,7 @@ class UnpaperImageTooLargeError(Exception):
 
 
 def version() -> Version:
-    return Version(get_version('unpaper'))
+    return Version(get_version('unpaper', regex=r'(?m).*?(\d+(\.\d+)(\.\d+)?)'))
 
 
 @contextmanager

src/ocrmypdf/_graft.py

@@ -61,19 +61,31 @@ def strip_invisible_text(pdf: Pdf, page: Page):
     stream = []
     in_text_obj = False
     render_mode = 0
+    render_mode_stack = []
     text_objects = []
 
     for operands, operator in parse_content_stream(page, ''):
+        if operator == Operator('Tr'):
+            render_mode = operands[0]
+
+        if operator == Operator('q'):
+            render_mode_stack.append(render_mode)
+
+        if operator == Operator('Q'):
+            try:
+                render_mode = render_mode_stack.pop()
+            except IndexError:
+                # Stack underflow: content stream is malformed
+                # but try to carry on
+                pass
+
         if not in_text_obj:
             if operator == Operator('BT'):
                 in_text_obj = True
-                render_mode = 0
                 text_objects.append((operands, operator))
             else:
                 stream.append((operands, operator))
         else:
-            if operator == Operator('Tr'):
-                render_mode = operands[0]
             text_objects.append((operands, operator))
             if operator == Operator('ET'):
                 in_text_obj = False

src/ocrmypdf/_logging.py

@@ -26,5 +26,5 @@ class PageNumberFilter(logging.Filter):
 class RichLoggingHandler(RichHandler):
     def __init__(self, console: Console, **kwargs):
         super().__init__(
-            console=console, show_level=False, show_time=False, markup=True, **kwargs
+            console=console, show_level=False, show_time=False, markup=False, **kwargs
         )

src/ocrmypdf/_metadata.py

@@ -15,6 +15,7 @@ from pikepdf import Dictionary, Name, Pdf
 from pikepdf import __version__ as PIKEPDF_VERSION
 from pikepdf.models.metadata import PdfMetadata, encode_pdf_date
 
+from ocrmypdf._annots import remove_broken_goto_annotations
 from ocrmypdf._defaults import PROGRAM_NAME
 from ocrmypdf._jobcontext import PdfContext
 from ocrmypdf._version import __version__ as OCRMYPF_VERSION

src/ocrmypdf/_pipeline.py

@@ -79,6 +79,14 @@ def triage_image_file(input_file: Path, output_file: Path, options) -> None:
     except OSError as e:
         # Recover the original filename
         log.error(str(e).replace(str(input_file), str(options.input_file)))
+        if not input_file.exists():
+            log.error("Input file does not exist: %s", input_file)
+        if input_file.is_dir():
+            log.error("Input file is a directory: %s", input_file)
+        if input_file.is_file():
+            log.error("Input file is a file: %s", input_file)
+        if input_file.stat().st_size == 0:
+            log.error("Input file is empty: %s", input_file)
         raise UnsupportedImageFormatError() from e
 
     with im:
@@ -159,8 +167,13 @@ def triage(
                     "Argument --image-dpi is being ignored because the "
                     "input file is a PDF, not an image."
                 )
-            # Origin file is a pdf create a symlink with pdf extension
-            safe_symlink(input_file, output_file)
+            try:
+                with pikepdf.open(input_file) as pdf:
+                    pdf.save(output_file)
+            except pikepdf.PdfError as e:
+                raise InputFileError() from e
+            except pikepdf.PasswordError as e:
+                raise EncryptedPdfError() from e
             return output_file
     except OSError as e:
         log.debug(f"Temporary file was at: {input_file}")
@@ -854,7 +867,7 @@ def fix_pagepdf_boxes(
             page.CropBox = cropbox
             page.TrimBox = trimbox
         pdf.save(out_file)
-    return pdf
+    return out_file
 
 
 def generate_postscript_stub(context: PdfContext) -> Path:

src/ocrmypdf/_pipelines/_common.py

@@ -20,7 +20,9 @@ from pathlib import Path
 from typing import NamedTuple, cast
 
 import PIL
+from pikepdf import Pdf
 
+from ocrmypdf._annots import remove_broken_goto_annotations
 from ocrmypdf._concurrent import Executor, setup_executor
 from ocrmypdf._jobcontext import PageContext, PdfContext
 from ocrmypdf._logging import PageNumberFilter
@@ -33,6 +35,7 @@ from ocrmypdf._pipeline import (
     generate_postscript_stub,
     get_orientation_correction,
     get_pdf_save_settings,
+    get_pdfinfo,
     optimize_pdf,
     preprocess_clean,
     preprocess_deskew,
@@ -51,9 +54,12 @@ from ocrmypdf.helpers import (
     available_cpu_count,
     check_pdf,
     pikepdf_enable_mmap,
+    running_in_docker,
+    running_in_snap,
     samefile,
 )
 from ocrmypdf.pdfa import file_claims_pdfa
+from ocrmypdf.pdfinfo import PdfInfo
 
 log = logging.getLogger(__name__)
 tls = threading.local()
@@ -100,6 +106,23 @@ class PageResult(NamedTuple):
     """Orientation correction in degrees."""
 
 
+class HOCRResultEncoder(json.JSONEncoder):
+    def default(self, obj):
+        if isinstance(obj, Path):
+            return {'Path': str(obj)}
+        return super().default(obj)
+
+
+class HOCRResultDecoder(json.JSONDecoder):
+    def __init__(self, *args, **kwargs):
+        super().__init__(object_hook=self.dict_to_object, *args, **kwargs)
+
+    def dict_to_object(self, d):
+        if 'Path' in d:
+            return Path(d['Path'])
+        return d
+
+
 @dataclass
 class HOCRResult:
     """Result when hOCR is finished processing."""
@@ -119,38 +142,14 @@ class HOCRResult:
     orientation_correction: int = 0
     """Orientation correction in degrees."""
 
-    def __getstate__(self):
-        """Return state values to be pickled."""
-        return {
-            k: (
-                ('Path://' + str(v))
-                if k in ('pdf_page_from_image', 'hocr', 'textpdf') and v is not None
-                else v
-            )
-            for k, v in self.__dict__.items()
-        }
-
-    def __setstate__(self, state):
-        """Restore state from the unpickled state values."""
-        self.__dict__.update(
-            {
-                k: (
-                    Path(v.removeprefix('Path://'))
-                    if k in ('pdf_page_from_image', 'hocr', 'textpdf') and v is not None
-                    else v
-                )
-                for k, v in state.items()
-            }
-        )
-
     @classmethod
     def from_json(cls, json_str: str) -> HOCRResult:
         """Create an instance from a dict."""
-        return cls(**json.loads(json_str))
+        return cls(**json.loads(json_str, cls=HOCRResultDecoder))
 
     def to_json(self) -> str:
         """Serialize to a JSON string."""
-        return json.dumps(self.__getstate__())
+        return json.dumps(self.__dict__, cls=HOCRResultEncoder)
 
 
 def configure_debug_logging(
@@ -183,7 +182,7 @@ def configure_debug_logging(
     return log_file_handler, remover
 
 
-def worker_init(max_pixels: int) -> None:
+def worker_init(max_pixels: int | None) -> None:
     """Initialize a worker thread or process."""
     # In Windows, child process will not inherit our change to this value in
     # the parent process, so ensure workers get it set. Not needed when running
@@ -215,6 +214,22 @@ def manage_debug_log_handler(
             remover()
 
 
+def _print_temp_folder_location(work_folder: Path):
+    """Print the location of the temporary work folder."""
+    msgs = [f"Temporary working files retained at:\n{work_folder}"]
+    if running_in_docker():  # pragma: no cover
+        msgs.append(
+            "OCRmyPDF is running in a Docker container, "
+            "so the files will be inside the container."
+        )
+    elif running_in_snap():  # pragma: no cover
+        msgs.append(
+            "OCRmyPDF is running in a Snap container, "
+            "so the files will be inside the container."
+        )
+    print('\n'.join(msgs), file=sys.stderr)
+
+
 @contextmanager
 def manage_work_folder(*, work_folder: Path, retain: bool, print_location: bool):
     try:
@@ -222,10 +237,7 @@ def manage_work_folder(*, work_folder: Path, retain: bool, print_location: bool)
     finally:
         if retain:
             if print_location:
-                print(
-                    f"Temporary working files retained at:\n{work_folder}",
-                    file=sys.stderr,
-                )
+                _print_temp_folder_location(work_folder)
         else:
             shutil.rmtree(work_folder, ignore_errors=True)
 
@@ -300,6 +312,20 @@ def setup_pipeline(
     return executor
 
 
+def do_get_pdfinfo(
+    pdf_path: Path, executor: Executor, options: argparse.Namespace
+) -> PdfInfo:
+    return get_pdfinfo(
+        pdf_path,
+        executor=executor,
+        detailed_analysis=options.redo_ocr,
+        progbar=options.progress_bar,
+        max_workers=options.jobs,
+        use_threads=options.use_threads,
+        check_pages=options.pages,
+    )
+
+
 def preprocess(
     page_context: PageContext,
     image: Path,
@@ -414,7 +440,14 @@ def postprocess(
     pdf_file: Path, context: PdfContext, executor: Executor
 ) -> tuple[Path, Sequence[str]]:
     """Postprocess the PDF file."""
-    pdf_out = pdf_file
+    # pdf_out = pdf_file
+    with Pdf.open(pdf_file) as pdf:
+        fix_annots = context.get_path('fix_annots.pdf')
+        if remove_broken_goto_annotations(pdf):
+            pdf.save(fix_annots)
+            pdf_out = fix_annots
+        else:
+            pdf_out = pdf_file
     if context.options.output_type.startswith('pdfa'):
         ps_stub_out = generate_postscript_stub(context)
         pdf_out = convert_to_pdfa(pdf_out, ps_stub_out, context)

src/ocrmypdf/_pipelines/hocr_to_ocr_pdf.py

@@ -19,11 +19,11 @@ from ocrmypdf._graft import OcrGrafter
 from ocrmypdf._jobcontext import PageContext, PdfContext
 from ocrmypdf._pipeline import (
     copy_final,
-    get_pdfinfo,
     render_hocr_page,
 )
 from ocrmypdf._pipelines._common import (
     HOCRResult,
+    do_get_pdfinfo,
     manage_work_folder,
     postprocess,
     report_output_pdf,
@@ -117,15 +117,7 @@ def run_hocr_to_ocr_pdf_pipeline(
         origin_pdf = work_folder / 'origin.pdf'
 
         # Gather pdfinfo and create context
-        pdfinfo = get_pdfinfo(
-            origin_pdf,
-            executor=executor,
-            detailed_analysis=options.redo_ocr,
-            progbar=options.progress_bar,
-            max_workers=options.jobs,
-            use_threads=options.use_threads,
-            check_pages=options.pages,
-        )
+        pdfinfo = do_get_pdfinfo(origin_pdf, executor, options)
         context = PdfContext(options, work_folder, origin_pdf, pdfinfo, plugin_manager)
         plugin_manager.hook.check_options(options=options)
         optimize_messages = exec_hocr_to_ocr_pdf(context, executor)

src/ocrmypdf/_pipelines/ocr.py

@@ -21,7 +21,6 @@ from ocrmypdf._graft import OcrGrafter
 from ocrmypdf._jobcontext import PageContext, PdfContext
 from ocrmypdf._pipeline import (
     copy_final,
-    get_pdfinfo,
     is_ocr_required,
     merge_sidecars,
     ocr_engine_hocr,
@@ -33,6 +32,7 @@ from ocrmypdf._pipeline import (
 from ocrmypdf._pipelines._common import (
     PageResult,
     cli_exception_handler,
+    do_get_pdfinfo,
     manage_debug_log_handler,
     manage_work_folder,
     postprocess,
@@ -171,16 +171,7 @@ def _run_pipeline(
         )
 
         # Gather pdfinfo and create context
-        pdfinfo = get_pdfinfo(
-            origin_pdf,
-            executor=executor,
-            detailed_analysis=options.redo_ocr,
-            progbar=options.progress_bar,
-            max_workers=options.jobs,
-            use_threads=options.use_threads,
-            check_pages=options.pages,
-        )
-
+        pdfinfo = do_get_pdfinfo(origin_pdf, executor, options)
         context = PdfContext(options, work_folder, origin_pdf, pdfinfo, plugin_manager)
 
         # Validate options are okay for this pdf

src/ocrmypdf/_pipelines/pdf_to_hocr.py

@@ -17,13 +17,13 @@ import PIL
 from ocrmypdf._concurrent import Executor
 from ocrmypdf._jobcontext import PageContext, PdfContext
 from ocrmypdf._pipeline import (
-    get_pdfinfo,
     is_ocr_required,
     ocr_engine_hocr,
     validate_pdfinfo_options,
 )
 from ocrmypdf._pipelines._common import (
     HOCRResult,
+    do_get_pdfinfo,
     manage_work_folder,
     process_page,
     set_thread_pageno,
@@ -94,18 +94,11 @@ def run_hocr_pipeline(
         work_folder=options.output_folder, retain=True, print_location=False
     ) as work_folder:
         executor = setup_pipeline(options, plugin_manager)
-        shutil.copy2(options.input_file, work_folder / 'origin.pdf')
+        origin_pdf = work_folder / 'origin.pdf'
+        shutil.copy2(options.input_file, origin_pdf)
 
         # Gather pdfinfo and create context
-        pdfinfo = get_pdfinfo(
-            options.input_file,
-            executor=executor,
-            detailed_analysis=options.redo_ocr,
-            progbar=options.progress_bar,
-            max_workers=options.jobs,
-            use_threads=options.use_threads,
-            check_pages=options.pages,
-        )
+        pdfinfo = do_get_pdfinfo(origin_pdf, executor, options)
         context = PdfContext(
             options, work_folder, options.input_file, pdfinfo, plugin_manager
         )

src/ocrmypdf/_progressbar.py

@@ -32,12 +32,76 @@ class ProgressBar(Protocol):
     The progress bar is held in the main process/thread and not updated by child
     process/threads. When a child notifies the parent of completed work, the
     parent updates the progress bar.
-
     Progress bars should never write to ``sys.stdout``, or they will corrupt the
     output if OCRmyPDF writes a PDF to standard output.
 
-    The type of events that OCRmyPDF reports to a progress bar may change in
+    Note:
+        The type of events that OCRmyPDF reports to a progress bar may change in
     minor releases.
+
+    Args:
+        total (int | float | None):
+            The total number of work units expected. If ``None``, the total is unknown.
+            For example, if you are processing pages, this might be the number of pages,
+            or if you are measuring overall progress in percent, this might be 100.
+        desc (str | None):
+            A brief description of the current step (e.g. "Scanning contents",
+            "OCR", "PDF/A conversion"). OCRmyPDF updates this before each major step.
+        unit (str | None):
+            A short label for the type of work being tracked (e.g. "page", "%", "image").
+        disable (bool):
+            If ``True``, progress updates are suppressed (no output). Defaults to ``False``.
+        **kwargs:
+            Future or extra parameters that OCRmyPDF might pass. Implementations
+            should accept and ignore unrecognized keywords gracefully.
+
+    Example:
+        A simple plugin implementation could look like this:
+
+        .. code-block:: python
+
+            from ocrmypdf.pluginspec import ProgressBar
+            from ocrmypdf import hookimpl
+
+            class ConsoleProgressBar(ProgressBar):
+                def __init__(self, *, total=None, desc=None, unit=None, disable=False, **kwargs):
+                    self.total = total
+                    self.desc = desc
+                    self.unit = unit
+                    self.disable = disable
+                    self.current = 0
+
+                def __enter__(self):
+                    if not self.disable:
+                        print(f"Starting {self.desc or 'an OCR task'} (total={self.total} {self.unit})")
+                    return self
+
+                def __exit__(self, exc_type, exc_value, traceback):
+                    if not self.disable:
+                        if exc_type is None:
+                            print("Completed successfully.")
+                        else:
+                            print(f"Task ended with error: {exc_value}")
+                    return False  # Let OCRmyPDF raise any exceptions
+
+                def update(self, n=1, *, completed=None):
+                    if completed is not None:
+                        # If 'completed' is given, you could set self.current = completed
+                        # but let's just read it to show usage
+                        print(f"Absolute completion reported: {completed}")
+                    # Otherwise, we increment by 'n'
+                    self.current += n
+                    if not self.disable:
+                        if self.total:
+                            percent = (self.current / self.total) * 100
+                            print(f"{self.desc}: {self.current}/{self.total} ({percent:.1f}%)")
+                        else:
+                            print(f"{self.desc}: {self.current} units done")
+
+            @hookimpl
+            def get_progressbar_class():
+                return MyProgressBar
+
     """
 
     def __init__(
@@ -51,13 +115,22 @@ class ProgressBar(Protocol):
     ):
         """Initialize a progress bar.
 
-        *total* indicates the total number of work units. If None, the total
-        number of work units is unknown. If *disable* is True, the progress bar
-        should be disabled. *unit* is a description of the work unit.
-        *desc* is a description of the overall task to be performed.
+        This is called once before any work is done. OCRmyPDF supplies the total
+        number of units (or None if unknown), a description of the work, and the
+        type of units. The ``disable`` parameter can be used to turn off progress
+        reporting. Unrecognized keyword arguments should be ignored.
 
-        Unrecognized keyword arguments must be ignored, as the list of keyword
-        arguments may grow with time.
+        Args:
+            total (int | float | None):
+                The total amount of work. If ``None``, the total is unknown.
+            desc (str | None):
+                A description of the current task. May change for different stages.
+            unit (str | None):
+                A short label for the unit of work.
+            disable (bool):
+                If ``True``, no output or logging should be displayed.
+            **kwargs:
+                Extra parameters that may be passed by OCRmyPDF in future versions.
         """
 
     def __enter__(self):
@@ -66,10 +139,32 @@ class ProgressBar(Protocol):
     def __exit__(self, *args):
         """Exit a progress bar context."""
 
-    def update(self, n=1, *, completed=None):
-        """Update the progress bar by an increment.
+    def update(self, n: float = 1, *, completed: float | None = None):
+        """Increment the progress bar by ``n`` units, or set an absolute completion.
 
-        For use within a progress bar context.
+        OCRmyPDF calls this method repeatedly while processing pages or other tasks.
+        If your total is known and you track it, you might do something like:
+
+        .. code-block:: python
+
+            self.current += n
+            percent = (self.current / total) * 100
+
+        The ``completed`` argument can indicate an absolute position, which is
+        particularly helpful if you're tracking a percentage of work (e.g., 0 to 100)
+        and want precise updates. In contrast, the incremental parameter ``n`` is
+        often more useful for page-based increments.
+
+        Args:
+            n (float, optional):
+                The amount to increment the progress by. Defaults to 1. May be
+                fractional if OCRmyPDF performs partial steps. If you are tracking
+                pages, this is typically how many pages have been processed in the
+                most recent step.
+            completed (float | None, optional):
+                The absolute amount of work completed so far. This can override or
+                supplement the simple increment logic. It's particularly useful
+                for percentage-based tracking (e.g., when ``total`` is 100).
         """
 
 

src/ocrmypdf/_validation.py

@@ -28,7 +28,13 @@ from ocrmypdf.exceptions import (
     MissingDependencyError,
     OutputFileAccessError,
 )
-from ocrmypdf.helpers import is_file_writable, monotonic, safe_symlink
+from ocrmypdf.helpers import (
+    is_file_writable,
+    monotonic,
+    running_in_docker,
+    running_in_snap,
+    safe_symlink,
+)
 from ocrmypdf.subprocess import check_external_program
 
 log = logging.getLogger(__name__)
@@ -237,18 +243,6 @@ def check_options(options: Namespace, plugin_manager: PluginManager) -> None:
     _check_plugin_options(options, plugin_manager)
 
 
-def _in_docker():
-    return Path('/.dockerenv').exists()
-
-
-def _in_snap():
-    try:
-        cgroup_text = Path('/proc/self/cgroup').read_text()
-        return 'snap.ocrmypdf' in cgroup_text
-    except FileNotFoundError:
-        return False
-
-
 def create_input_file(options: Namespace, work_folder: Path) -> tuple[Path, str]:
     if options.input_file == '-':
         # stdin
@@ -272,7 +266,7 @@ def create_input_file(options: Namespace, work_folder: Path) -> tuple[Path, str]
             return target, os.fspath(options.input_file)
         except FileNotFoundError as e:
             msg = f"File not found - {options.input_file}"
-            if _in_docker():  # pragma: no cover
+            if running_in_docker():  # pragma: no cover
                 msg += (
                     "\nDocker cannot access your working directory unless you "
                     "explicitly share it with the Docker container and set up"
@@ -282,7 +276,7 @@ def create_input_file(options: Namespace, work_folder: Path) -> tuple[Path, str]
                     "\tdocker run -i --rm jbarlow83/ocrmypdf - - <input.pdf >output.pdf"
                     "\n"
                 )
-            elif _in_snap():  # pragma: no cover
+            elif running_in_snap():  # pragma: no cover
                 msg += (
                     "\nSnap applications cannot access files outside of "
                     "your home directory unless you explicitly allow it. "

src/ocrmypdf/api.py

@@ -14,7 +14,7 @@ from collections.abc import Iterable, Sequence
 from enum import IntEnum
 from io import IOBase
 from pathlib import Path
-from typing import AnyStr, BinaryIO
+from typing import BinaryIO
 from warnings import warn
 
 import pluggy
@@ -28,7 +28,7 @@ from ocrmypdf._validation import check_options
 from ocrmypdf.cli import ArgumentParser, get_parser
 from ocrmypdf.helpers import is_iterable_notstr
 
-StrPath = Path | AnyStr
+StrPath = Path | str | bytes
 PathOrIO = BinaryIO | StrPath
 
 # Installing plugins affects the global state of the Python interpreter,
@@ -140,9 +140,9 @@ def configure_logging(
 
 def _kwargs_to_cmdline(
     *, defer_kwargs: set[str], **kwargs
-) -> tuple[list[str], dict[str, AnyStr]]:
+) -> tuple[list[str | bytes], dict[str, str | bytes]]:
     """Convert kwargs to command line arguments."""
-    cmdline = []
+    cmdline: list[str | bytes] = []
     deferred = {}
     for arg, val in kwargs.items():
         if val is None:
@@ -279,7 +279,7 @@ def ocr(  # noqa: D417
     fast_web_view: float | None = None,
     continue_on_soft_render_error: bool | None = None,
     invalidate_digital_signatures: bool | None = None,
-    plugins: Iterable[StrPath] | None = None,
+    plugins: Iterable[Path | str] | None = None,
     plugin_manager=None,
     keep_temporary_files: bool | None = None,
     progress_bar: bool | None = None,
@@ -420,7 +420,7 @@ def _pdf_to_hocr(  # noqa: D417
     continue_on_soft_render_error: bool | None = None,
     invalidate_digital_signatures: bool | None = None,
     plugin_manager=None,
-    plugins: Sequence[StrPath] | None = None,
+    plugins: Sequence[Path | str] | None = None,
     keep_temporary_files: bool | None = None,
     **kwargs,
 ):
@@ -491,7 +491,7 @@ def _hocr_to_ocr_pdf(  # noqa: D417
     color_conversion_strategy: str | None = None,
     fast_web_view: float | None = None,
     plugin_manager=None,
-    plugins: Sequence[StrPath] | None = None,
+    plugins: Sequence[Path | str] | None = None,
     **kwargs,
 ):
     """Run OCRmyPDF on a work folder and produce an output PDF.

src/ocrmypdf/helpers.py

@@ -335,3 +335,17 @@ def pikepdf_enable_mmap() -> None:
         )
     except AttributeError:
         log.debug("pikepdf mmap not available")
+
+
+def running_in_docker() -> bool:
+    """Returns True if we seem to be running in a Docker container."""
+    return Path('/.dockerenv').exists()
+
+
+def running_in_snap() -> bool:
+    """Returns True if we seem to be running in a Snap container."""
+    try:
+        cgroup_text = Path('/proc/self/cgroup').read_text()
+        return 'snap.ocrmypdf' in cgroup_text
+    except FileNotFoundError:
+        return False

src/ocrmypdf/hocrtransform/_hocr.py

@@ -1,6 +1,7 @@
 # SPDX-FileCopyrightText: 2010 Jonathan Brinley
 # SPDX-FileCopyrightText: 2013-2014 Julien Pfefferkorn
 # SPDX-FileCopyrightText: 2023 James R. Barlow
+# SPDX-FileCopyrightText: 2025 Odin Dahlström
 # SPDX-License-Identifier: MIT
 
 """hOCR transform implementation."""
@@ -13,7 +14,7 @@ import re
 import unicodedata
 from dataclasses import dataclass
 from itertools import pairwise
-from math import atan, cos, pi
+from math import atan, pi
 from pathlib import Path
 from xml.etree import ElementTree
 
@@ -82,6 +83,13 @@ class HocrTransform:
         ''',
         re.VERBOSE,
     )
+    textangle_pattern = re.compile(
+        r'''
+        textangle \s+
+        ([\-\+]?\d*\.?\d*)  # +/- decimal float
+        ''',
+        re.VERBOSE,
+    )
 
     def __init__(
         self,
@@ -156,6 +164,14 @@ class HocrTransform:
             return (0.0, 0.0)
         return float(matches.group(1)), int(matches.group(2))
 
+    @classmethod
+    def textangle(cls, element: Element) -> float:
+        """Get text angle of an element."""
+        matches = cls.textangle_pattern.search(element.attrib.get('title', ''))
+        if not matches:
+            return 0.0
+        return float(matches.group(1))
+
     def _child_xpath(self, html_tag: str, html_class: str | None = None) -> str:
         xpath = f".//{self.xmlns}{html_tag}"
         if html_class:
@@ -210,7 +226,7 @@ class HocrTransform:
                     for element in par.iterfind(self._child_xpath('span'))
                     if 'class' in element.attrib
                     and element.attrib['class']
-                    in {'ocr_header', 'ocr_line', 'ocr_textfloat'}
+                    in {'ocr_header', 'ocr_line', 'ocr_textfloat', 'ocr_caption'}
                 ):
                     found_lines = True
                     direction = self._get_text_direction(par)
@@ -247,9 +263,13 @@ class HocrTransform:
 
     def _get_text_direction(self, par):
         """Get the text direction of the paragraph.
-
+    
         Arabic, Hebrew, Persian, are right-to-left languages.
+        When the paragraph element is None, defaults to left-to-right.
         """
+        if par is None:
+            return TextDirection.LTR
+            
         return (
             TextDirection.RTL
             if par.attrib.get('dir', 'ltr') == 'rtl'
@@ -290,50 +310,69 @@ class HocrTransform:
         """
         if line is None:
             return
-        line_box = self.element_coordinates(line)
-        if not line_box:
+        # line_min_aabb (which is created from the "bbox" hOCR property) is so named
+        # because a Rectangle instance is always an AABB (it has no orientation).
+        # However, this means that for non-zero values of the "textangle" hOCR
+        # property, line_min_aabb is not the true bounding box of the hOCR line,
+        # but rather the minimum AABB that encloses the bounding box of the line.
+        # The true bounding box of the line must be seen as an OBB, due to the
+        # existance of the "textangle" hOCR property.
+        line_min_aabb = self.element_coordinates(line)
+        if not line_min_aabb:
             return
-        if line_box.ury <= line_box.lly:
+        if line_min_aabb.ury <= line_min_aabb.lly:
             log.error(
                 "line box is invalid so we cannot render it: box=%s text=%s",
-                line_box,
+                line_min_aabb,
                 self._get_element_text(line),
             )
             return
+        self._debug_draw_line_bbox(canvas, line_min_aabb)
 
-        self._debug_draw_line_bbox(canvas, line_box)
+        # Even though line_min_aabb is not the true bounding box of the line,
+        # it is still possible to derive an AABB (Rectangle) from it that is
+        # the same size as the true bounding box of the line,
+        # if we use a coordinate system that is axis-aligned with respect to
+        # the rotation of the OBB (textangle).
+        # line_size_aabb_matrix is a transform matrix for such a coordinate
+        # system, and line_size_aabb is thus an AABB with the same
+        # size as the true bounding box of the line.
+        top_left_corner = (line_min_aabb.llx, line_min_aabb.lly)
+        line_size_aabb_matrix = (
+            Matrix()
+            .translated(*top_left_corner)
+            # Note: negative sign (textangle is counter-clockwise, see hOCR spec)
+            .rotated(-self.textangle(line))
+        )
+        line_size_aabb = line_size_aabb_matrix.inverse().transform(line_min_aabb)
 
-        # Baseline is a polynomial (usually straight line) that describes the
-        # text baseline relative to the bottom left corner of the line bounding
-        # box.
-        bottom_left_corner = line_box.llx, line_box.ury
         slope, intercept = self.baseline(line)
         if abs(slope) < 0.005:
             slope = 0.0
-        angle = atan(slope)
+        slope_angle = atan(slope)
 
-        # Setup a new coordinate system on the line box's intercept and rotated by
-        # its slope.
-        line_matrix = (
-            Matrix()
-            .translated(*bottom_left_corner)
+        # Final PDF-perspective (bottom-left corner) transform matrix for the
+        # text baseline, which has an intercept and slope relative to the OBB.
+        # See "bbox", "textangle" and "baseline" in the hOCR spec for more details.
+        baseline_matrix = (
+            line_size_aabb_matrix
+            # Translate from hOCR perspective (top-left corner) to PDF perspective
+            # (bottom-left corner).
+            # Note: it would be incorrect to use line_min_aabb.height here because
+            # it is not the true height of the OBB of the line, if textangle != 0.
+            .translated(0, line_size_aabb.height)
             .translated(0, intercept)
-            .rotated(angle / pi * 180)
+            .rotated(slope_angle / pi * 180)
         )
-        log.debug(line_matrix)
-        with canvas.do.save_state(cm=line_matrix):
-            text = Text(direction=text_direction)
 
-            # Don't allow the font to break out of the bounding box. Division by
-            # cos_a accounts for extra clearance between the glyph's vertical axis
-            # on a sloped baseline and the edge of the bounding box.
-            line_box_height = abs(line_box.height) / cos(angle)
-            fontsize = line_box_height + intercept
+        with canvas.do.save_state(cm=baseline_matrix):
+            text = Text(direction=text_direction)
+            fontsize = line_size_aabb.height + intercept
             text.font(self._fontname, fontsize)
             text.render_mode(3 if invisible_text else 0)
 
             self._debug_draw_baseline(
-                canvas, line_matrix.inverse().transform(line_box), 0
+                canvas, baseline_matrix.inverse().transform(line_min_aabb), 0
             )
 
             canvas.do.fill_color(BLACK)  # text in black
@@ -341,7 +380,7 @@ class HocrTransform:
             for elem, next_elem in pairwise(elements + [None]):
                 self._do_line_word(
                     canvas,
-                    line_matrix,
+                    baseline_matrix,
                     text,
                     fontsize,
                     elem,
@@ -357,7 +396,7 @@ class HocrTransform:
         line_matrix: Matrix,
         text: Text,
         fontsize: float,
-        elem: Element,
+        elem: Element | None,
         next_elem: Element | None,
         text_direction: TextDirection,
         inject_word_breaks: bool,
@@ -396,7 +435,7 @@ class HocrTransform:
         )
         if hocr_next_box is None:
             return
-        # Render a space this word and the next word. The explicit space helps
+        # Render a space between this word and the next word. The explicit space helps
         # PDF viewers identify the word break, and horizontally scaling it to
         # occupy the space the between the words helps the PDF viewer
         # avoid combiningthewordstogether.
@@ -409,7 +448,7 @@ class HocrTransform:
             space_box = Rectangle(next_box.urx, box.lly, box.llx, next_box.ury)
         self._debug_draw_space_bbox(canvas, space_box)
         space_width = self._font.text_width(' ', fontsize)
-        if space_width > 0:
+        if space_width > 0 and space_box.width > 0:
             if text_direction == TextDirection.LTR:
                 text.text_transform(Matrix(1, 0, 0, -1, space_box.llx, 0))
             elif text_direction == TextDirection.RTL:
@@ -434,7 +473,7 @@ class HocrTransform:
                 if ocr_par is None:
                     continue
                 canvas.do.rect(
-                    ocr_par.llx, ocr_par.lly, ocr_par.width, ocr_par.height, fill=0
+                    ocr_par.llx, ocr_par.lly, ocr_par.width, ocr_par.height, fill=False
                 )
 
     def _debug_draw_line_bbox(self, canvas: Canvas, line_box: Rectangle, color=BLUE):
@@ -443,7 +482,7 @@ class HocrTransform:
             return
         with canvas.do.save_state():
             canvas.do.stroke_color(color).line_width(0.15).rect(
-                line_box.llx, line_box.lly, line_box.width, line_box.height, fill=0
+                line_box.llx, line_box.lly, line_box.width, line_box.height, fill=False
             )
 
     def _debug_draw_word_triangle(
@@ -467,7 +506,7 @@ class HocrTransform:
             return
         with canvas.do.save_state():
             canvas.do.stroke_color(color).line_width(line_width).rect(
-                box.llx, box.lly, box.width, box.height, fill=0
+                box.llx, box.lly, box.width, box.height, fill=False
             )
 
     def _debug_draw_space_bbox(
@@ -478,7 +517,7 @@ class HocrTransform:
             return
         with canvas.do.save_state():
             canvas.do.fill_color(color).line_width(line_width).rect(
-                box.llx, box.lly, box.width, box.height, fill=1
+                box.llx, box.lly, box.width, box.height, fill=True
             )
 
     def _debug_draw_baseline(

src/ocrmypdf/optimize.py

@@ -75,10 +75,15 @@ def extract_image_filter(
     """Determine if an image is extractable."""
     if image.Subtype != Name.Image:
         return None
-    if image.Length < 100:
+    if not isinstance(image.Length, int) or image.Length < 100:
         log.debug(f"xref {xref}: skipping image with small stream size")
         return None
-    if image.Width < 8 or image.Height < 8:  # Issue 732
+    if (
+        not isinstance(image.Width, int)
+        or not isinstance(image.Height, int)
+        or image.Width < 8
+        or image.Height < 8
+    ):  # Issue 732
         log.debug(f"xref {xref}: skipping image with unusually small dimensions")
         return None
 
@@ -154,7 +159,10 @@ def extract_image_jbig2(
                 imgname = root / f'{xref:08d}'
                 with imgname.open('wb') as f:
                     ext = pim.extract_to(stream=f)
-                imgname.rename(imgname.with_suffix(ext))
+                # Rename the file so it has .prejbig2.ext extension
+                # Making it unique avoids problems with Windows if the
+                # same image is extracted multiple times
+                imgname.rename(imgname.with_suffix(".prejbig2" + ext))
             except NotImplementedError as e:
                 if '/Decode' in str(e):
                     log.debug(
@@ -170,7 +178,7 @@ def extract_image_jbig2(
                     pim.obj.ColorSpace = colorspace
                 else:
                     del pim.obj.ColorSpace
-            return XrefExt(xref, ext)
+            return XrefExt(xref, ".prejbig2" + ext)
     return None
 
 

src/ocrmypdf/pdfinfo/info.py

@@ -12,7 +12,7 @@ import re
 import statistics
 from collections import defaultdict
 from collections.abc import Callable, Container, Iterable, Iterator, Mapping, Sequence
-from contextlib import contextmanager
+from contextlib import contextmanager, nullcontext
 from decimal import Decimal
 from enum import Enum, auto
 from functools import partial
@@ -24,6 +24,7 @@ from warnings import warn
 
 from pdfminer.layout import LTPage, LTTextBox
 from pikepdf import (
+    Dictionary,
     Matrix,
     Name,
     Object,
@@ -40,7 +41,12 @@ from ocrmypdf._concurrent import Executor, SerialExecutor
 from ocrmypdf._progressbar import ProgressBar
 from ocrmypdf.exceptions import EncryptedPdfError, InputFileError
 from ocrmypdf.helpers import Resolution, available_cpu_count, pikepdf_enable_mmap
-from ocrmypdf.pdfinfo.layout import LTStateAwareChar, get_page_analysis, get_text_boxes
+from ocrmypdf.pdfinfo.layout import (
+    LTStateAwareChar,
+    PdfMinerState,
+    get_page_analysis,
+    get_text_boxes,
+)
 
 logger = logging.getLogger()
 
@@ -378,14 +384,15 @@ class ImageInfo:
             # itself. Some PDF writers use this to create a grayscale stencil
             # mask. For our purposes, the effective size is the size of the
             # larger component (image or smask).
-            self._width = max(smask.get(Name.Width, 0), self._width)
-            self._height = max(smask.get(Name.Height, 0), self._height)
+            if isinstance(smask, Stream | Dictionary):
+                self._width = max(smask.get(Name.Width, 0), self._width)
+                self._height = max(smask.get(Name.Height, 0), self._height)
         if (mask := pim.obj.get(Name.Mask, None)) is not None:
             # If the image has a /Mask entry, it has an explicit mask.
             # /Mask can be a Stream or an Array. If it's a Stream,
             # use its /Width and /Height if they are larger than the main
             # image's.
-            if isinstance(mask, Stream):
+            if isinstance(mask, Stream | Dictionary):
                 self._width = max(mask.get(Name.Width, 0), self._width)
                 self._height = max(mask.get(Name.Height, 0), self._height)
 
@@ -700,13 +707,13 @@ def _page_has_text(text_blocks: Iterable[FloatRect], page_width, page_height) ->
 
 
 def simplify_textboxes(
-    miner: LTPage, textbox_getter: Callable[[LTPage], Iterator[LTTextBox]]
+    miner_page: LTPage, textbox_getter: Callable[[LTPage], Iterator[LTTextBox]]
 ) -> Iterator[TextboxInfo]:
     """Extract only limited content from text boxes.
 
     We do this to save memory and ensure that our objects are pickleable.
     """
-    for box in textbox_getter(miner):
+    for box in textbox_getter(miner_page):
         first_line = box._objs[0]  # pylint: disable=protected-access
         first_char = first_line._objs[0]  # pylint: disable=protected-access
         if not isinstance(first_char, LTStateAwareChar):
@@ -753,9 +760,12 @@ def _pdf_pageinfo_sync(
     infile: Path,
     check_pages: Container[int],
     detailed_analysis: bool,
+    miner_state: PdfMinerState | None,
 ) -> PageInfo:
     with _pdf_pageinfo_sync_pdf(thread_pdf, infile) as pdf:
-        return PageInfo(pdf, pageno, infile, check_pages, detailed_analysis)
+        return PageInfo(
+            pdf, pageno, infile, check_pages, detailed_analysis, miner_state
+        )
 
 
 def _pdf_pageinfo_concurrent(
@@ -767,6 +777,7 @@ def _pdf_pageinfo_concurrent(
     progbar,
     check_pages,
     detailed_analysis: bool = False,
+    miner_state: PdfMinerState | None = None,
 ) -> Sequence[PageInfo | None]:
     pages: list[PageInfo | None] = [None] * len(pdf.pages)
 
@@ -798,7 +809,8 @@ def _pdf_pageinfo_concurrent(
     initial_pdf = pdf if use_threads else None
 
     contexts = (
-        (n, initial_pdf, infile, check_pages, detailed_analysis) for n in range(total)
+        (n, initial_pdf, infile, check_pages, detailed_analysis, miner_state)
+        for n in range(total)
     )
     assert n_workers == 1 if use_threads else n_workers >= 1, "Not multithreadable"
     logger.debug(
@@ -865,12 +877,15 @@ class PageInfo:
         infile: PathLike,
         check_pages: Container[int],
         detailed_analysis: bool = False,
+        miner_state: PdfMinerState | None = None,
     ):
         """Initialize a PageInfo object."""
         self._pageno = pageno
         self._infile = infile
         self._detailed_analysis = detailed_analysis
-        self._gather_pageinfo(pdf, pageno, infile, check_pages, detailed_analysis)
+        self._gather_pageinfo(
+            pdf, pageno, infile, check_pages, detailed_analysis, miner_state
+        )
 
     def _gather_pageinfo(
         self,
@@ -879,6 +894,7 @@ class PageInfo:
         infile: PathLike,
         check_pages: Container[int],
         detailed_analysis: bool,
+        miner_state: PdfMinerState | None,
     ):
         page: Page = pdf.pages[pageno]
         mediabox = [Decimal(d) for d in page.mediabox.as_list()]
@@ -894,10 +910,11 @@ class PageInfo:
         check_this_page = pageno in check_pages
 
         if check_this_page and detailed_analysis:
-            pscript5_mode = str(pdf.docinfo.get(Name.Creator)).startswith('PScript5')
-            miner = get_page_analysis(infile, pageno, pscript5_mode)
-            if miner is not None:
-                self._textboxes = list(simplify_textboxes(miner, get_text_boxes))
+            page_analysis = miner_state.get_page_analysis(pageno)
+            if page_analysis is not None:
+                self._textboxes = list(
+                    simplify_textboxes(page_analysis, get_text_boxes)
+                )
             else:
                 self._textboxes = []
             bboxes = (box.bbox for box in self._textboxes)
@@ -1150,16 +1167,26 @@ class PdfInfo:
         with Pdf.open(infile) as pdf:
             if pdf.is_encrypted:
                 raise EncryptedPdfError()  # Triggered by encryption with empty passwd
-            self._pages = _pdf_pageinfo_concurrent(
-                pdf,
-                executor,
-                max_workers,
-                use_threads,
-                infile,
-                progbar,
-                check_pages=check_pages,
-                detailed_analysis=detailed_analysis,
+            pscript5_mode = str(pdf.docinfo.get(Name.Creator, "")).startswith(
+                'PScript5'
             )
+            self._miner_state = (
+                PdfMinerState(infile, pscript5_mode)
+                if detailed_analysis
+                else nullcontext()
+            )
+            with self._miner_state as miner_state:
+                self._pages = _pdf_pageinfo_concurrent(
+                    pdf,
+                    executor,
+                    max_workers,
+                    use_threads,
+                    infile,
+                    progbar,
+                    check_pages=check_pages,
+                    detailed_analysis=detailed_analysis,
+                    miner_state=miner_state,
+                )
             self._needs_rendering = pdf.Root.get(Name.NeedsRendering, False)
             if Name.AcroForm in pdf.Root:
                 if len(pdf.Root.AcroForm.get(Name.Fields, [])) > 0:

src/ocrmypdf/pdfinfo/layout.py

@@ -18,6 +18,7 @@ import pdfminer.encodingdb
 import pdfminer.pdfdevice
 import pdfminer.pdfinterp
 import pdfminer.psparser
+from deprecation import deprecated
 from pdfminer.converter import PDFLayoutAnalyzer
 from pdfminer.layout import LAParams, LTChar, LTPage, LTTextBox
 from pdfminer.pdfcolor import PDFColorSpace
@@ -289,6 +290,7 @@ def patch_pdfminer(pscript5_mode: bool):
         yield
 
 
+@deprecated(deprecated_in='16.6.0', details='Use PdfMinerState instead.')
 def get_page_analysis(
     infile: PathLike, pageno: int, pscript5_mode: bool
 ) -> LTPage | None:
@@ -319,6 +321,68 @@ def get_page_analysis(
     return dev.get_result()
 
 
+class PdfMinerState:
+    """Provide a context manager for using pdfminer.six.
+
+    This ensures that the file is closed. It also provides a cache of pages
+    from the PDF so that they can be reused if needed, to improve performance.
+    """
+
+    def __init__(self, infile: Path, pscript5_mode: bool) -> None:
+        """Initialize the context manager.
+
+        Args:
+            infile: The path to the PDF file to be analyzed.
+            pscript5_mode: Whether the PDF was generated by PScript5.dll.
+        """
+        self.infile = infile
+        self.rman = pdfminer.pdfinterp.PDFResourceManager(caching=True)
+        self.disable_boxes_flow = None
+        self.page_iter = None
+        self.page_cache: list[PDFPage] = []
+        self.pscript5_mode = pscript5_mode
+        self.file = None
+
+    def __enter__(self):
+        """Enter the context manager."""
+        self.file = Path(self.infile).open('rb')
+        self.page_iter = PDFPage.get_pages(self.file)
+        return self
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        """Exit the context manager."""
+        if self.file:
+            self.file.close()
+        return True
+
+    def get_page_analysis(self, pageno: int):
+        """Get the page analysis for a given page."""
+        while len(self.page_cache) <= pageno:
+            try:
+                self.page_cache.append(next(self.page_iter))
+            except StopIteration:
+                raise InputFileError(
+                    f"pdfminer did not find page {pageno} in the input file."
+                )
+        page = self.page_cache[pageno]
+        if not page:
+            raise InputFileError(
+                f"pdfminer could not process page {pageno} (counting from 0)."
+            )
+        dev = TextPositionTracker(
+            self.rman,
+            laparams=LAParams(
+                all_texts=True, detect_vertical=True, boxes_flow=self.disable_boxes_flow
+            ),
+        )
+        interp = pdfminer.pdfinterp.PDFPageInterpreter(self.rman, dev)
+
+        with patch_pdfminer(self.pscript5_mode):
+            interp.process_page(page)
+
+        return dev.get_result()
+
+
 def get_text_boxes(obj) -> Iterator[LTTextBox]:
     """Get the text boxes attached to the current node."""
     for child in obj:

src/ocrmypdf/pluginspec.py

@@ -145,13 +145,15 @@ def get_progressbar_class() -> type[ProgressBar]:
     The class returned by this function must be compatible with the
     :class:`ProgressBar` protocol.
 
-    Here is how OCRmyPDF will use the progress bar:
-
     Example:
-        pbar_class = pm.hook.get_progressbar_class()
-        with pbar_class(**progress_kwargs) as pbar:
-            ...
-            pbar.update(1)
+        Here is how OCRmyPDF will use the progress bar:
+
+        .. code-block:: python
+
+            pbar_class = pm.hook.get_progressbar_class()
+            with pbar_class(**progress_kwargs) as pbar:
+                ... # do some work
+                pbar.update(1)
     """
 
 

src/ocrmypdf/subprocess/__init__.py

@@ -215,8 +215,10 @@ to have {found_version}.  Please update this program.
 
 OLD_VERSION_REQUIRED_FOR = '''
 OCRmyPDF requires '{program}' {need_version} or higher when run with the
-{required_for} arguments.  If you omit these arguments, OCRmyPDF may be able to
-proceed.  For best results, install the program.
+{required_for} arguments.  {program} {found_version} is installed.
+
+If you omit these arguments, OCRmyPDF may be able to
+proceed.  For best results, update the program.
 '''
 
 OSX_INSTALL_ADVICE = '''

tests/conftest.py

@@ -24,11 +24,6 @@ def is_macos():
     return platform.system() == 'Darwin'
 
 
-def running_in_docker():
-    # Docker creates a file named /.dockerenv in all supported versions
-    return Path('/.dockerenv').exists()
-
-
 def have_unpaper():
     try:
         unpaper.version()

tests/test_annots.py

@@ -0,0 +1,31 @@
+# SPDX-FileCopyrightText: 2024 James R. Barlow
+# SPDX-License-Identifier: MPL-2.0
+
+from __future__ import annotations
+
+import pytest
+from pikepdf import Array, Dictionary, Name, NameTree, Pdf
+
+from ocrmypdf._annots import remove_broken_goto_annotations
+
+
+def test_remove_broken_goto_annotations(resources):
+    with Pdf.open(resources / 'link.pdf') as pdf:
+        assert not remove_broken_goto_annotations(pdf), "File should not be modified"
+
+        # Construct Dests nametree
+        nt = NameTree.new(pdf)
+        names = pdf.Root[Name.Names] = pdf.make_indirect(Dictionary())
+        names[Name.Dests] = nt.obj
+        # Create a broken named destination
+        nt['Invalid'] = pdf.make_indirect(Dictionary())
+        # Create a valid named destination
+        nt['Valid'] = Array([pdf.pages[0].obj, Name.XYZ, 0, 0, 0])
+
+        pdf.pages[0].Annots[0].A.D = 'Missing'
+        pdf.pages[1].Annots[0].A.D = 'Valid'
+
+        assert remove_broken_goto_annotations(pdf), "File should be modified"
+
+        assert Name.D not in pdf.pages[0].Annots[0].A
+        assert Name.D in pdf.pages[1].Annots[0].A

tests/test_api.py

@@ -3,6 +3,7 @@
 
 from __future__ import annotations
 
+import pickle
 from io import BytesIO
 from pathlib import Path
 
@@ -10,6 +11,7 @@ import pytest
 from pdfminer.high_level import extract_text
 
 import ocrmypdf
+import ocrmypdf._pipelines
 import ocrmypdf.api
 
 
@@ -35,7 +37,7 @@ def test_sidecar_stringio(resources: Path, outdir: Path, outpdf: Path):
         resources / 'ccitt.pdf',
         outpdf,
         plugins=['tests/plugins/tesseract_cache.py'],
-        sidecar=s
+        sidecar=s,
     )
     s.seek(0)
     assert b'the' in s.getvalue()
@@ -75,3 +77,29 @@ def test_hocr_to_pdf_api(resources: Path, outdir: Path, outpdf: Path):
     text = extract_text(outpdf)
     assert 'hocr' in text and 'the' not in text
 
+
+def test_hocr_result_json():
+    result = ocrmypdf._pipelines._common.HOCRResult(
+        pageno=1,
+        pdf_page_from_image=Path('a'),
+        hocr=Path('b'),
+        textpdf=Path('c'),
+        orientation_correction=180,
+    )
+    assert (
+        result.to_json()
+        == '{"pageno": 1, "pdf_page_from_image": {"Path": "a"}, "hocr": {"Path": "b"}, '
+        '"textpdf": {"Path": "c"}, "orientation_correction": 180}'
+    )
+    assert ocrmypdf._pipelines._common.HOCRResult.from_json(result.to_json()) == result
+
+
+def test_hocr_result_pickle():
+    result = ocrmypdf._pipelines._common.HOCRResult(
+        pageno=1,
+        pdf_page_from_image=Path('a'),
+        hocr=Path('b'),
+        textpdf=Path('c'),
+        orientation_correction=180,
+    )
+    assert result == pickle.loads(pickle.dumps(result))

tests/test_completion.py

@@ -8,7 +8,7 @@ from subprocess import run
 
 import pytest
 
-from .conftest import running_in_docker
+from ocrmypdf.helpers import running_in_docker
 
 pytestmark = pytest.mark.skipif(
     running_in_docker(),

tests/test_ghostscript.py

@@ -11,10 +11,12 @@ from unittest.mock import patch
 
 import pikepdf
 import pytest
+from packaging.version import Version
 from PIL import Image, UnidentifiedImageError
 
+from ocrmypdf._exec import ghostscript
 from ocrmypdf._exec.ghostscript import DuplicateFilter, rasterize_pdf
-from ocrmypdf.exceptions import ColorConversionNeededError, ExitCode
+from ocrmypdf.exceptions import ColorConversionNeededError, ExitCode, InputFileError
 from ocrmypdf.helpers import Resolution
 
 from .conftest import check_ocrmypdf, run_ocrmypdf_api
@@ -139,7 +141,7 @@ def test_ghostscript_mandatory_color_conversion(resources, outpdf):
 
 def test_rasterize_pdf_errors(resources, no_outpdf, caplog):
     with patch('ocrmypdf._exec.ghostscript.run') as mock:
-        # ghostscript can produce
+        # ghostscript can produce empty files with return code 0
         mock.return_value = subprocess.CompletedProcess(
             ['fakegs'], returncode=0, stdout=b'', stderr=b'error this is an error'
         )
@@ -208,3 +210,71 @@ class TestDuplicateFilter:
         assert caplog.records[1].msg == "another error message"
         assert caplog.records[2].msg == "(suppressed 5 repeated lines)"
         assert caplog.records[3].msg == "yet another error message"
+
+
+@pytest.fixture
+def pdf_with_invalid_image(outdir):
+    # issue 1451
+    Name = pikepdf.Name
+    pdf = pikepdf.new()
+    pdf.add_blank_page()
+    pdf.pages[0].Contents = pdf.make_stream(b'612 0 0 612 0 0 cm /Image Do')
+    # Create an invalid image object that has both ColorSpace and ImageMask set
+    pdf.pages[0].Resources = pikepdf.Dictionary(
+        XObject=pdf.make_indirect(
+            pikepdf.Dictionary(
+                Image=pdf.make_stream(
+                    b"\xf0\x0f" * 8,
+                    ColorSpace=Name.DeviceGray,
+                    BitsPerComponent=1,
+                    Width=8,
+                    Height=8,
+                    ImageMask=True,
+                    Subtype=Name.Image,
+                    Type=Name.XObject,
+                )
+            )
+        )
+    )
+    pdf.save(outdir / 'invalid_image.pdf')
+    pdf.save('invalid_image.pdf')
+    return outdir / 'invalid_image.pdf'
+
+
+@pytest.mark.xfail(
+    ghostscript.version() < Version('10.04.0'),
+    reason="Older Ghostscript behavior is different",
+)
+def test_recoverable_image_error(pdf_with_invalid_image, outdir, caplog):
+    # When stop_on_error is False, we expect Ghostscript to print an error
+    # but continue
+    rasterize_pdf(
+        outdir / 'invalid_image.pdf',
+        outdir / 'out.png',
+        raster_device='pngmono',
+        raster_dpi=Resolution(10, 10),
+        stop_on_error=False,
+    )
+    assert 'Image has both ImageMask and ColorSpace' in caplog.text
+
+
+@pytest.mark.xfail(
+    ghostscript.version() < Version('10.04.0'),
+    reason="Older Ghostscript behavior is different",
+)
+def test_recoverable_image_error_with_stop(pdf_with_invalid_image, outdir, caplog):
+    # When stop_on_error is True, Ghostscript will print an error and exit
+    # but still produce a viable image. We intercept this case and raise
+    # InputFileError because it will contain an image of the whole page minus
+    # the image we are rendering.
+    with pytest.raises(
+        InputFileError, match="Try using --continue-on-soft-render-error"
+    ):
+        rasterize_pdf(
+            outdir / 'invalid_image.pdf',
+            outdir / 'out.png',
+            raster_device='pngmono',
+            raster_dpi=Resolution(100, 100),
+            stop_on_error=True,
+        )
+    # out2.png will not be created; if it were it would be blank.

tests/test_graft.py

@@ -40,3 +40,72 @@ def test_links(resources, outpdf):
         p2 = pdf.pages[1]
         assert p1.Annots[0].A.D[0].objgen == p2.objgen
         assert p2.Annots[0].A.D[0].objgen == p1.objgen
+
+
+def test_strip_invisble_text():
+    pdf = pikepdf.Pdf.new()
+    print(pikepdf.parse_content_stream(pikepdf.Stream(pdf, b'3 Tr')))
+    page = pdf.add_blank_page()
+    visible_text = [
+        pikepdf.ContentStreamInstruction((), pikepdf.Operator('BT')),
+        pikepdf.ContentStreamInstruction(
+            (pikepdf.Name('/F0'), 12), pikepdf.Operator('Tf')
+        ),
+        pikepdf.ContentStreamInstruction((288, 720), pikepdf.Operator('Td')),
+        pikepdf.ContentStreamInstruction(
+            (pikepdf.String('visible'),), pikepdf.Operator('Tj')
+        ),
+        pikepdf.ContentStreamInstruction((), pikepdf.Operator('ET')),
+    ]
+    invisible_text = [
+        pikepdf.ContentStreamInstruction((), pikepdf.Operator('BT')),
+        pikepdf.ContentStreamInstruction(
+            (pikepdf.Name('/F0'), 12), pikepdf.Operator('Tf')
+        ),
+        pikepdf.ContentStreamInstruction((288, 720), pikepdf.Operator('Td')),
+        pikepdf.ContentStreamInstruction(
+            (pikepdf.String('invisible'),), pikepdf.Operator('Tj')
+        ),
+        pikepdf.ContentStreamInstruction((), pikepdf.Operator('ET')),
+    ]
+    invisible_text_setting_tr = [
+        pikepdf.ContentStreamInstruction((), pikepdf.Operator('BT')),
+        pikepdf.ContentStreamInstruction([3], pikepdf.Operator('Tr')),
+        pikepdf.ContentStreamInstruction(
+            (pikepdf.Name('/F0'), 12), pikepdf.Operator('Tf')
+        ),
+        pikepdf.ContentStreamInstruction((288, 720), pikepdf.Operator('Td')),
+        pikepdf.ContentStreamInstruction(
+            (pikepdf.String('invisible'),), pikepdf.Operator('Tj')
+        ),
+        pikepdf.ContentStreamInstruction((), pikepdf.Operator('ET')),
+    ]
+    stream = [
+        pikepdf.ContentStreamInstruction([], pikepdf.Operator('q')),
+        pikepdf.ContentStreamInstruction([3], pikepdf.Operator('Tr')),
+        *invisible_text,
+        pikepdf.ContentStreamInstruction([], pikepdf.Operator('Q')),
+        *visible_text,
+        *invisible_text_setting_tr,
+        *invisible_text,
+    ]
+    content_stream = pikepdf.unparse_content_stream(stream)
+    page.Contents = pikepdf.Stream(pdf, content_stream)
+
+    def count(string, page):
+        return len(
+            [
+                True
+                for operands, operator in pikepdf.parse_content_stream(page)
+                if operator == pikepdf.Operator('Tj')
+                and operands[0] == pikepdf.String(string)
+            ]
+        )
+
+    nr_visible_pre = count('visible', page)
+    ocrmypdf._graft.strip_invisible_text(pdf, page)
+    nr_visible_post = count('visible', page)
+    assert (
+        nr_visible_pre == nr_visible_post
+    ), 'Number of visible text elements did not change'
+    assert count('invisible', page) == 0, 'No invisible elems left'

tests/test_helpers.py

@@ -13,8 +13,7 @@ import pytest
 from packaging.version import Version
 
 from ocrmypdf import helpers
-
-from .conftest import running_in_docker
+from ocrmypdf.helpers import running_in_docker
 
 needs_symlink = pytest.mark.skipif(os.name == 'nt', reason='needs posix symlink')
 windows_only = pytest.mark.skipif(os.name != 'nt', reason="Windows test")

tests/test_hocrtransform.py

@@ -84,13 +84,19 @@ def test_hocrtransform_matches_sandwich(resources, outdir):
     def clean(s):
         s = re.sub(r'\s+', ' ', s)
         words = s.split(' ')
-        return '\n'.join(sorted(words))
+        return set(words)
 
-    hocr_txt = clean(text_from_pdf(outdir / 'hocr.pdf'))
-    tess_txt = clean(text_from_pdf(outdir / 'tess.pdf'))
+    hocr_words = clean(text_from_pdf(outdir / 'hocr.pdf'))
+    tess_words = clean(text_from_pdf(outdir / 'tess.pdf'))
+
+    similarity = len(hocr_words & tess_words) / len(hocr_words | tess_words)
 
     # from pathlib import Path
-    # Path('hocr.txt').write_text(hocr_txt)
-    # Path('tess.txt').write_text(tess_txt)
 
-    assert hocr_txt == tess_txt
+    # Path('hocr.txt').write_text(sorted('\n'.join(hocr_words)))
+    # Path('tess.txt').write_text(sorted('\n'.join(tess_words)))
+    # Path('mismatch.txt').write_text(
+    #     '\n'.join(sorted(hocr_words ^ tess_words)), encoding='utf8'
+    # )
+
+    assert similarity > 0.99

tests/test_main.py

@@ -18,6 +18,7 @@ from PIL import Image
 import ocrmypdf
 from ocrmypdf._exec import tesseract
 from ocrmypdf.exceptions import ExitCode, MissingDependencyError
+from ocrmypdf.helpers import running_in_docker
 from ocrmypdf.pdfa import file_claims_pdfa
 from ocrmypdf.pdfinfo import Colorspace, Encoding, PdfInfo
 from ocrmypdf.subprocess import get_version
@@ -29,7 +30,6 @@ from .conftest import (
     is_macos,
     run_ocrmypdf,
     run_ocrmypdf_api,
-    running_in_docker,
 )
 
 # pylint: disable=redefined-outer-name

tests/test_metadata.py

@@ -398,42 +398,3 @@ def test_prevent_gs_invalid_xml(resources, outdir):
     # Ensure we did not carry the nul forward.
     assert contents.find(b'�', xmp_start, xmp_end) == -1, "found escaped nul"
     assert contents.find(b'\x00', xmp_start, xmp_end) == -1
-
-
-@pytest.mark.xfail(
-    ghostscript.version() >= Version('10.01.2'),
-    reason=(
-        "Ghostscript now exits with an error on invalid DocumentInfo, defeating "
-        "this test.",
-    ),
-)
-def test_malformed_docinfo(caplog, resources, outdir):
-    generate_pdfa_ps(outdir / 'pdfa.ps')
-
-    with pikepdf.open(resources / 'trivial.pdf') as pdf:
-        pdf.trailer.Info = pikepdf.Stream(pdf, b"<xml></xml>")
-        pdf.save(outdir / 'layers.rendered.pdf', fix_metadata_version=False)
-
-    _, options, _ = get_parser_options_plugins(
-        args=[
-            '-j',
-            '1',
-            '--output-type',
-            'pdfa-2',
-            'a.pdf',
-            'b.pdf',
-        ]
-    )
-    pdfinfo = PdfInfo(outdir / 'layers.rendered.pdf')
-    context = PdfContext(
-        options, outdir, outdir / 'layers.rendered.pdf', pdfinfo, get_plugin_manager([])
-    )
-
-    convert_to_pdfa(
-        str(outdir / 'layers.rendered.pdf'), str(outdir / 'pdfa.ps'), context
-    )
-
-    print(caplog.records)
-    assert any(
-        'malformed DocumentInfo block' in record.message for record in caplog.records
-    )

tests/test_pdfinfo.py

@@ -208,12 +208,13 @@ def test_pages_issue700(monkeypatch, resources):
     monkeypatch.setattr(PDFPage, 'get_pages', get_no_pages)
 
     with pytest.raises(InputFileError, match="pdfminer"):
-        pdfinfo.PdfInfo(
+        pi = pdfinfo.PdfInfo(
             resources / 'cardinal.pdf',
             detailed_analysis=True,
             progbar=False,
             max_workers=1,
         )
+        pi._miner_state.get_page_analysis(0)
 
 
 @pytest.fixture

tests/test_unpaper.py

@@ -5,7 +5,7 @@ from __future__ import annotations
 
 import logging
 from os import fspath
-from unittest.mock import patch
+from unittest.mock import Mock, patch
 
 import pytest
 from packaging.version import Version
@@ -48,6 +48,19 @@ def test_old_unpaper(resources, no_outpdf):
         mock.assert_called()
 
 
+def test_unpaper_version_chatter(resources, no_outpdf):
+    input_ = fspath(resources / "c02-22.pdf")
+    output = fspath(no_outpdf)
+
+    _parser, options, pm = get_parser_options_plugins(["--clean", input_, output])
+    with patch("ocrmypdf.subprocess.run") as mock:
+        mock.return_value = Mock(stdout='Warning: using insecure memory!\n7.0.0\n')
+
+        with pytest.raises(MissingDependencyError):
+            check_options(options, pm)
+        mock.assert_called()
+
+
 @needs_unpaper
 def test_clean(resources, outpdf):
     check_ocrmypdf(