posterization

noun

pos·ter·i·za·tion ˌpō-stə-rə-ˈzā-shən

plural posterizations

: the obtaining of posterlike reproductions having solid tones or colors and little detail from photographs or other continuous-tone originals by means of separation negatives

: the visual effect produced when an image (such as a print or photograph) has a limited number of tones or colors rather than gradations of tone and color

I noticed posterization (the tendency for sudden shifts in color and shading where they should be gradual) in one drawing.—

Tony Hoffman

US sports, informal : the act or action of posterizing an opponent

The Warriors faithful will never forget 6-foot-3 Baron Davis soaring over the 6-9 Kirilenko for a massive posterization dunk in Golden State's only win.—

Jody Genessy