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join:2001-05-08
1 edit | reply to Andrew J
Re: Punch Up Those Photos (Gimp Style)
From the link you provided Andrew J  :
"Local contrast enhancement, as with sharpening, can also create unwanted color changes if performed on all three color channels. In addition, Local contrast enhancement can increase color saturation significantly. You can eliminate these unwanted effects by either performing local contrast enhancement in the lightness channel of the LAB color space, or in a separate layer (while still in an RGB working space) and blending using "luminosity" in the layers window.
Local contrast enhancement can also clip highlights in regions which are both very bright and adjacent to a darker region. For this reason, it should be performed before adjusting levels (if levels are used bring tones to the extreme highlights within the image histogram). This allows for a "buffer zone" when local contrast enhancement extends the lightest and darkest tones to full white or black, respectively.
Care should also be taken when using this technique because it can detract from the "smoothness" of tones within your image-- thereby changing its mood. Portrait photography is one area where one should be particularly cautious with this technique".
Nice link Andrew J . |
