EN: Posterization


A graphic effect in which an area of an image with a smooth transition of tones is replaced with several areas of fewer tones.
Nikon Grossary




occurs when a gradual or smooth tonal transition in an image appears or is made to appear as an abrupt change from one tone to another. Digitally, it can be achieved by limiting the number of colors in an image so that the change from one tone to another is sudden, rather than continuous and gradual. Posterization can be noticed, for example, in an image that has a relatively large area of color that appears banded where the tonal changes should instead appear to be gradual.

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