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posterization

[poh-ster-uh-zey-shuh n]
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noun Printing.
  1. a process for producing a posterlike, high-contrast color reproduction from continuous-tone art by using separation negatives of various densities.
  2. Photography. a printing process in which all tone values of a negative are reduced to a few and the tonal separation negatives produced are printed at different exposure levels on a high-contrast film so that a set of flat tones results.
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Origin of posterization

First recorded in 1945–50; poster1 + -ization
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018