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Remove tesseract renderer entirely

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Grafting lets us work with older Tesseract versions as if they could use
sandwich, so there is no point in keeping it. It's been deprecated for a
long time now anyway.
This commit is contained in:
James R. Barlow
2018-05-10 14:06:13 -07:00
parent e0bb898f29
commit b8f3ead541
4 changed files with 8 additions and 53 deletions
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docs/advanced.rst
+2 -2
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@@ -105,7 +105,7 @@ rendering
Creating a new PDF from other data (such as an existing PDF).
OCRmyPDF has three PDF renderers: ``sandwich``, ``hocr``, ``tesseract``. The renderer may be selected using ``--pdf-renderer``. The default is ``auto`` which lets OCRmyPDF select the renderer to use. Currently, ``auto`` selects ``sandwich`` for Tesseract 3.05.01 or newer, or ``hocr`` for older versions of Tesseract.
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`` selects ``sandwich`` for Tesseract 3.05.01 or newer, or ``hocr`` for older versions of Tesseract.
The ``sandwich`` renderer
"""""""""""""""""""""""""
@@ -132,4 +132,4 @@ This works in all versions of Tesseract.
The ``tesseract`` renderer
""""""""""""""""""""""""""
The ``tesseract`` renderer is deprecated, and is now an alias for the ``sandwich`` renderer. The alias will be removed in a future release.
The ``tesseract`` renderer was removed. OCRmyPDF's new approach to text layer grafting makes it functionally equivalent to ``sandwich``.
docs/languages.rst
-15
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@@ -59,18 +59,3 @@ If you wish to add a single language pack, you could do the following:
.. code-block:: bash
host$ docker commit <container_id> ocrmypdf-tess4-heb
Known limitations
-----------------
As of v4.2, users of ocrmypdf working languages outside the Latin alphabet should use the following syntax:
.. code-block:: bash
ocrmypdf -l eng+gre --output-type pdf --pdf-renderer tesseract
The reasons for this are:
* The latest version of Ghostscript (9.19 as of this writing) has unfixed bugs in Unicode handling that generate invalid character maps, so Ghostscript cannot be used for PDF/A conversion
* The default "hocr" PDF renderer does not handle Asian fonts properly