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An image sometimes needs to be displayed using a limited number of colors. This can lead to posterization, where smooth gradations in color are reduced to sharp bands.
To offset this problem, the nearest available colors can be stipled together to approximate the original color. Stipling can be done in an even pattern, called patterned dithering. Random dithering can break up the texture that patterned dithering can produce, but leads to a fuzzy appearance. Diffusion dithering is similar to random dithering, but the points are spaced more uniformly, appearing less "clumped."
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