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I've had to deal with image scans and my own approach lately has been to quantize to 16-color (grayscale via pngquant) and oxipng with zopfli set to max. Mostly so that the output can be easily used in a browser UI.

Will definitely have to look into your solution with JBIG2 next time. Though I may keep with png just for compatibility sake.

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Yeah, I had Claude generate me the jbig2 to 1-bit png wasm module from the jbig2 source so that there'd be no dependencies on zlib or libpng. Then I aggressively removed functions from 97kb down to 17kb. So if it's missing functions you need you may need to reset the files to the .bak and recompile.

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