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RGB
The red, green, and blue (RGB) color system can represent a large portion of the color spectrum by mixing these three primary colors. Since cathode ray tube devices, such as computer monitors, display color with red, green, and blue light, this is the color system of the Web. There are 216 RGB colors that appear without dithering (i.e., without varying the pattern of dots in an image) in browsers for the PC and Macintosh platforms