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When doing scans, gimp does a lovely job of slightly enhancing the resulting scan from the menu: tools->color tools->levels and then pressing the 'auto' button. Does anyone know an ImageMagick ...
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  1. #1
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    ImageMagick equivalent to gimp tools->color tools->levels->auto


    When doing scans, gimp does a lovely job of slightly enhancing the resulting scan from the menu: tools->color tools->levels and then pressing the 'auto' button.

    Does anyone know an ImageMagick equivalent for this that I can include in the scan script I already use, without having to fire up gimp on each scan?

    Even with the gimp source, I'm can't seem to figure out exactly what it's doing when you hit the 'auto' button.

  2. #2
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    It seems to do the same thing as ImageMagick's -normalize, but on each channel separately. You can do that with ImageMagick by adding something like -channel All, but do you really want to do this? It causes a color shift that looks really bad in some images. Only using -normalize seems better to me.

  3. #3
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    Cool. I'll play with that, thank you.

    Also, my scanner is ancient, so that may be an issue too. It takes a while to warm up, and the first scan always looks bad and goes to the bit bucket right away.

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