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Chapter 18. Controlling Overall Page App... > Understanding RGB Color Values

Understanding RGB Color Values

The proper combination of red, green, and blue light can perfectly simulate any color humans can perceive. Computer video equipment leverages this effect to display color pictures. For each pixel (picture element) on the monitor screen, the application specifies the desired amount of red, green, and blue light. Most video equipment provides 256 intensities of red light, 256 of green, and 256 of blue. This produces 16,777,216 combinations, which is more colors than the eye can discern.

The Red, Green, Blue (RGB) system of color values describes colors just as video cards and monitors do: as three color intensities, each ranging from 0 to 255. Here are some examples:


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