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Color Adjustment Theory

Whether your goal is exact reproduction of an image on paper or screen, or creating a special effect, manipulating the tonality and color of an image can be key. Tonality, the brightness of an image's pixels, can be the cumulative product of an image's component color channels, or it can be controlled through a separate channel (Lab color mode). Color (as well as grayscale and black-and-white values) is always stored in color channels. Manipulating these values can improve—or at least change—the appearance of your image.

To learn more about color channels and how they work, see Chapter 16, “Channels: The Ultimate Creative Control,” p. 513.



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