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{{mainarticle|Color quantization}}
Color quantization reduces the number of colors used in an image; this is important for displaying images on devices that support a limited number of colors and for efficiently compressing certain kinds of images. Most bitmap editors and many operating systems have built-in support for color quantization. Popular modern color quantization algorithms include the nearest color algorithm (for fixed palettes), the [[Median cut|median cut algorithm]], and an algorithm based on [[octree]]s.
It is common to combine color quantization with [[dither|dithering]] to create an impression of a larger number of colors and eliminate [[colour banding|banding]] artifacts.
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