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Grokking The Gimp
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6.2.4 Other Colors We Know

If there are identifiable colors other than neutrals in an image, these, too, can be used to perform color correction. Examples are the colors of flags, logos, or certain animals. A Canadian flag whose famous maple leaf emblem were not red would be a good point of reference for color correction.

Another important class of colors that can be found in many images are fleshtones.   A medium Caucasian fleshtone has a green around 192, a red that is about 20% more (234), and a blue about 10% less (176). Darker skinned people have skin colors with more blue and less red, and Asians have less blue. Because of the variability of skin tones, relying on them as guides is more uncertain than using neutrals. Nevertheless, for some images this may be the only point of reference available for color correction.

Grokking The Gimp
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