[aidenn0]

https://github.com/internetarchive/archive-pdf-tools

Though note that this uses j2k by default and jpegoptim for JPEGs. For pages that are mostly just images (e.g. color comics) I prefer to use cjpegli on each page and img2pdf to combine them to a PDF.

Modifying archive-pdf-tools to allow use of cjpegli is something I keep meaning to look into[1], but not at the top of my list.

1: In my tests, cjpegli is more consistent than j2k compressors; that is, for each image there is a setting that j2k does as good, or better, than JPEG, but there is no setting for which j2k averages better than cjpegli because cjpegli just does such a good job of aggressively compressing while always looking good