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Just because colorcasts are harder to see in dark areas doesn't mean that they're notthere. If you have a color cast in your highlights, nine times outof ten you'll have a color cast in the entire image. Color casts that aresimilar, such as blue and cyan or magenta and red, take a bit of practice toidentify correctly. The tools used to identify a color cast are your visual memory, the Infopalette, the individual image channels, and practice. If it looksfor discussion'ssakeslightly blue, then you know that the image has a blue cast.Interestingly enough, clearing up the color cast in the lighter and neutralareas usually takes care of most of the required color correction workthroughout the entire image. Whenevaluating an image for color, find a neutral reference, something that shouldbe white, near white, or gray. Forexample, a gray sidewalk would be a good place to look for a color cast. The color correction process always starts by identifying the colorcastyou have to know what the problem is before you can apply a solution.Color casts, also referred to as a shade or tinge, are easier to identify inlighter image areas, such as a white shirt or wall or in neutral areas. Photoshop Restoration & Retouching, 2nd Edition
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