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The Hidden Power of Adjustment Layers in Adobe® Photoshop® by Scott Valentine

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Chapter 7. Histograms and Curves

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By now, most people who use digital cameras are familiar with histograms, a graphical representations of the number of bright and dark pixels in an image. Generally, the left side of a histogram represents black and the right represents white.

Although it may be difficult to see, a histogram is made up of many tiny vertical columns. The horizontal axis usually represents individual values of brightness from zero (black) to 255 (white), although some histograms show individual colors.

Histograms

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The left vertical ...

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