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How do I normalize all pixel values such that all pixel values are 'pulled towards' the mean?

A levels adjustment would likely be the best option for you. This can be done in software such as Photoshop (not free) or GIMP (free). In Photoshop do Image > Adjustments > Levels In GIMP do ...
Billy Kerr's user avatar
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How do I normalize all pixel values such that all pixel values are 'pulled towards' the mean?

Photoshop's 'Threshold' is good for that kind of task - though I'm not sure how you could automate it. Having said that, Readiris can do it too - & no doubt other OCR software.
Tetsujin's user avatar
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