Thread: Improving images in ebooks
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Old 08-19-2021, 12:35 PM   #4
j.p.s
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Join Date: Apr 2011
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archive.org grayscale PDFs from scans compose pages from 2 PBM files and a PGM file. One of the PBM files is a mask which allows the background of the page to be made pure white. Details in the post at:

https://www.mobileread.com/forums/sh...94&postcount=3
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