jbig2enc

As I understand, the technology was protected by a patent help by guys at Leptonica and it exprided. There is a crude project for encoding images to jbig2 at https://github.com/agl/jbig2enc. I am sharing my personal scripts here [1] (windows) that wrap that for end to end djvu to pdf for scanned texts using jbig2 compressed images in the pdf instead of jpeg. This combines decent compression with pdf handiness. djvu still compresses better but pdfs can be got under twice the side, that sounds no impressive, but many common available pipelines produce sizes x3, x4 and worse, a particular offender those using ghostscript pdfwriter. The sripts have worked months locally but are given "as is" without testing, with zero support, you deal with python dependencies and having jbig2 and djvu-libre tools in the path. Beyond image compression tech, t

No you can't. For example I use a script to compress scanned PDFs by combining individually processed JBIG2 images and that script hasn't been updated for more than a decade: https://github.com/agl/jbig2enc/blob/master/pdf.py It works and generates perfectly good PDFs. No it doesn't work with Python 3 because it mixes bytes and strings copiously. I could spend half an hour upgrading it to work with Python 3 but there's no reason to. Don't forget the whole reason why Python 3 exists is because it broke compatibility with Python 2. Plenty of old unmaintained scripts were forever stuck in Python 2. Not to mention an old version of Python 3 actually performs worse than Python 2.