Quote:
Originally Posted by csr
I am trying to produce some reasonably well-formatted, attractive ebooks from scanned public domain works from Internet Archive, [...] But the images, which were generally b & w sketches, have a very yellowed background. What is the simplest way to get rid of the yellowing?
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Wrote a little about this last year:
2020: "How to handle images in books while doing OCR of books?"
But especially see the 2 older threads I linked to by GrannyGrump + SBT... they both explain how they use photo editors to get rid of the yellow background + do a better grayscale conversion.