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Old 05-10-2012, 04:50 AM   #6
SBT
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Posts: 503
Karma: 560981
Join Date: Sep 2010
Location: Norway
Device: prs-t1, phone/Cool Reader, tablet/BlueFire, Nook Simple
Hmm... isn't this a good idea for a wiki page?
I've previously suggested using imagemagick. Though excellent if you need to batch-process dozens of files, it's rather demanding to master.

Gimp isn't the most user-friendly either, but you get decent results with it:
  1. Load image
  2. Rotate as necessary [From toolbox]
  3. Crop as necessary [Select rectangle tool in toolbox, then Image->crop to selection]
  4. Choose Tools->Color->desaturate to get B&W
  5. Choose Tools->Color->levels:
  6. Tweak black and white levels by:
    • selecting the black or white eyedropper tools and click on a region of the image that should be black/white.
    • and/or Use the sliders beneath the histogram.
    • and/or click on 'Edit as curves' to get even more control.

I also like to use Filters->Unsharp to enhance the image.
There's also an excellent wavelet denoising plugin that can be installed which works wonders on grainy images.
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