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The use of existing colours to approximate another colour which was not contained in the palette of the graphics program used to create a picture. The approximation is achieved by drawing adjacent pixels in different colours. One of the problems with dithering is that if it is used in a Graphics Interchange Format-based graphic it reduces the compression efficiency, since the lossless compression scheme used for such graphics performs relatively poorly when adjacent pixels are of different colours.

Subjects: Computing.

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