Definitions for "Posterisation"
A high-contrast reproduction of a continuous tone image.
A banding effect produced by reducing the number of grey tones in an image.
Phenomenon consisting in widening the range of the tonalities. The tone dark are obscured more still, and the tone lights cleared up simultaneously, making disappear certain levels from gray. The histogram corresponding to this image presents gaps, there is a break in the transition the tone. Contrasts with the image are widened being able to make disappear certain details.
This is a form of graduation, where it is desirable to have bands of colour created marking out the changes in shade.