Hi. I have such an hot request. Would it be possible to create the possibility of modifying the image in terms of gamma correction? In the "Image" section, there is already a "Brightness/Contrast" correction, but "Gamma" would give the possibility of correction, which is hard to do by adjusting the brightness and contrast ... Many thanks in advance :)
Michael
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Most frequently, I scan receipts, which have notoriously variable ink density.
The page on the left is untouched, the page on the right is a rescan. I selected that preview, then ran Image > Document Correction. Unless I'm misunderstanding the feature, Document Correction makes no visible difference to the naked eye.
Oh yeah that's not a color balance issue that can be corrected with post-processing (Document Correction helps when things are grey instead of proper white/black). It's a scan issue, and NAPS2 doesn't yet allow custom SANE options which presumably help here.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Hi. I have such an hot request. Would it be possible to create the possibility of modifying the image in terms of gamma correction? In the "Image" section, there is already a "Brightness/Contrast" correction, but "Gamma" would give the possibility of correction, which is hard to do by adjusting the brightness and contrast ... Many thanks in advance :)
Michael
Bumping this post. My scanner is unsupported in recent MacOS versions but Xsane on arm64 Ubuntu VM seems to do gamma correction
There's no manual gamma option, but you could try "Document Correction" under the "Image" menu, which does an automatic adjustment.
Most frequently, I scan receipts, which have notoriously variable ink density.
The page on the left is untouched, the page on the right is a rescan. I selected that preview, then ran Image > Document Correction. Unless I'm misunderstanding the feature, Document Correction makes no visible difference to the naked eye.
Oh yeah that's not a color balance issue that can be corrected with post-processing (Document Correction helps when things are grey instead of proper white/black). It's a scan issue, and NAPS2 doesn't yet allow custom SANE options which presumably help here.
You could try scanning "Grayscale" instead of "Black and White" (then follow it up with "Document Correction").
Grayscale is the key. Pure B&W would be ideal but this will do.
For posterity, I've attached the workflow other visitors might be familiar with and expecting.