- Tong - on wrote...
| Hi Anthony,
|
| On http://www.imagemagick.org/Usage/photos/, you have a minor
| underexposure example.
|
| Before going into -sigmoidal-contrast operator, maybe it is a good
| idea to first discuss convert's built-in -normalize operator that
| is similar to GIMP's "auto-levels" or "normalize" feature that
| stretch pixel values from darkest to brightest.
|
| convert minor.jpg -normalize minor.normalized.jpg
|
| Also, maybe you'd like to through in how IM can also create the
| three-color histogram out of it:
|
| convert minor.jpg histogram:- | convert - minor.histogram.jpg
|
| Looking at the histogram, I think it may explain what you wrote:
|
Also see the more low level operator discussions on the
'Color Modifications' page...
http://www.imagemagick.org/Usage/colors/
Anthony Thyssen ( System Programmer ) <[EMAIL PROTECTED]>
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