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docs: some mild improvements

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James R. Barlow
2020-02-25 22:23:58 -08:00
parent 43a23e3695
commit 0417610f9b
4 changed files with 15 additions and 6 deletions
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docs/index.rst
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OCRmyPDF documentation
======================
OCRmyPDF adds an OCR text layer to scanned PDF files, allowing them to
be searched.
OCRmyPDF adds an optical charcter 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
docs/installation.rst
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| |fedora-29| |fedora-30| |fedora-rawhide| |
+-----------------------------------------------+
Users of Fedora 29 later may simply
Users of Fedora 29 or later may simply
.. code-block:: bash
docs/introduction.rst
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`Optical character
recognition <https://en.wikipedia.org/wiki/Optical_character_recognition>`__
is technology that converts images of typed or handwritten text, such as
in a scanned document, to computer text that can be searched and copied.
in a scanned document, to computer text that can be selected, searched and copied.
OCRmyPDF uses
`Tesseract <https://github.com/tesseract-ocr/tesseract>`__, the best
docs/languages.rst
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Installing additional language packs
====================================
OCRmyPDF uses Tesseract for OCR, and relies on its language packs for
languages other than English.
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/master/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``.
After you have installed a language pack, you can use it ``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: