making a high-contrast picture from a continuous-tone color image (also posterisation)
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Posterization Definition from Science & Technology Dictionaries & Glossaries
The conversion of continuous tone data into a series of visible tonal steps or bands.
Posterization Definition from Encyclopedia Dictionaries & Glossaries
Posterization of an image entails conversion of a continuous gradation of tone to several regions of fewer tones, with abrupt changes from one tone to another. This was originally done with photographic processes to create posters. It can now be done photographically or with digital image processing, and may be deliberate or may be an unintended artifact of color quantization.
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