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b8f3ead541
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.
62 lines
2.1 KiB
ReStructuredText
62 lines
2.1 KiB
ReStructuredText
.. _lang-packs:
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Installing additional language packs
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====================================
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OCRmyPDF uses Tesseract for OCR, and relies on its language packs for languages other than English.
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Tesseract supports `most languages <https://github.com/tesseract-ocr/tesseract/blob/master/doc/tesseract.1.asc#languages>`_.
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For Linux users, you can often find packages that provide language packs:
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Debian and Ubuntu users
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-----------------------
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.. code-block:: bash
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# Display a list of all Tesseract language packs
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apt-cache search tesseract-ocr
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# Debian/Ubuntu users
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apt-get install tesseract-ocr-chi-sim # Example: Install Chinese Simplified language back
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You can then pass the ``-l LANG`` argument to OCRmyPDF to give a hint as to what languages it should search for. Multiple
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languages can be requested using either ``-l eng+fre`` (English and French) or ``-l eng -l fre``.
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macOS users
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-----------
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You can install additional language packs by :ref:`installing Tesseract using Homebrew with all language packs <macos-all-languages>`.
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Docker users
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------------
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Users of the Docker image may use the alternative :ref:`"polyglot" container <docker-polyglot>` which includes all languages.
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Adding individual language packs to a Docker image
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""""""""""""""""""""""""""""""""""""""""""""""""""
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If you wish to add a single language pack, you could do the following:
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* Download the desired ``.trainedata`` file from the `tessdata <https://github.com/tesseract-ocr/tessdata>`_ repository. Let's use Hebrew in this example (``heb.traineddata``)
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* Copy the file to ``/home/user/downloads/heb.traineddata``.
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* Create a new container based on the ocrmypdf-tess4 image and jump into it with a terminal:
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.. code-block:: bash
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host$ docker run -v /home/user/downloads:/home/docker -it --entrypoint /bin/bash ocrmypdf-tess4
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* Put the file where Tesseract expects it:
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.. code-block:: bash
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docker$ cp /home/docker/heb.traineddata /usr/share/tesseract-ocr/tessdata
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* Note the container id, and save it as a new image (in this example, ``ocrmypdf-tess4-heb``)
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.. code-block:: bash
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host$ docker commit <container_id> ocrmypdf-tess4-heb
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