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And of course the PDF spec later added the successor to DjVu's JBIG compression as an option, the JBIG2 compression. It can be x4 better than TIFF for 2 level images like text or fax.
However I think most scan to PDF software free on Windows doesn't use it, judging from the size.
If we were re-inventing Topaz, then JBIG2 is freely available.
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