Thread: whiten gray paper in pdf?
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Old 02-01-2021, 05:33 PM   #3
Tex2002ans
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Quote:
Originally Posted by prom king View Post
I have some scanned papers with text in pdf and paper is kind of yellowed, so is there a way to somehow whiten the paper and perhaps blacken the letters and drawings?
ScanTailor Advanced is one of the best tools for this:

https://github.com/4lex4/scantailor-...es/tag/v1.0.16

What you'll need to do is split your PDF into individual images, then ScanTailor Advanced should be able to do the "unyellowing" and straightening and everything else.

I wrote about that last year in:
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