Re: Punch Up Those Photos (Gimp Style)

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Andrew J Premium join:2001-11-09 Lancaster, PA clubs: ·Comcast ·Vonage ·Verizon Online DSL	Re: Punch Up Those Photos (Gimp Style) You seem to be doing a slight variation of this adjustment that takes 3 seconds in Elements and 16 bit: »www.cambridgeincolour.com/tutori···ment.htm -- Best Team.
	permalink · 2006-01-05 09:22:38 ·

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Re: Punch Up Those Photos (Gimp Style)

This does so much more than local contrast enhancement, though. Disregarding the color change, it may have a somewhat similar effect, but this method is for more than "stretching out" the color DR, which is all LCE really does. This method actually differentiates between hues. Read through some of ET's past LAB links.
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permalink · 2006-01-05 13:12:28 ·

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said by Andrew J

:

You seem to be doing a slight variation of this adjustment that takes 3 seconds in Elements and 16 bit:
»www.cambridgeincolour.com/tutori···ment.htm

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

permalink · 2006-01-05 13:21:30 · Print ·

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