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21 lines
949 B
ReStructuredText
21 lines
949 B
ReStructuredText
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Installing a JBIG2 encoder
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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.
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JBIG2 encoding is recommended for OCRmyPDF and is used to losslessly create smaller PDFs. If JBIG2 encoding not available, lower quality encodings will be used.
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JBIG2 decoding is not patented and is performed automatically by most PDF viewers. It is widely supported has been part of the PDF specification since 2001.
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On macOS, Homebrew packages jbig2enc and OCRmyPDF includes it by default. The Docker image for OCRmyPDF also builds its own JBIG2 encoder from source.
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For all other Linux, you must build a JBIG2 encoder from source:
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.. code-block:: bash
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git clone https://github.com/agl/jbig2enc
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cd jbig2enc
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./autogen.sh
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./configure && make
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[sudo] make install
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