I'd be interested if anything open source exists that can do jbig/jpeg2k pdfs (separation + compression) like DjVU. I think archive.org ships PDFs like this, bu

I'd be interested if anything open source exists that can do jbig/jpeg2k pdfs (separation + compression) like DjVU. I think archive.org ships PDFs like this, but don't know what they're using to do it (possibly something commercial?).