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Verb: posterize  'pow-stu,rIz
  1. Reduce the number of colour tones in an image, changing a continuous gradation of tone to several regions of fewer tones, with abrupt changes from one tone to another
    "The graphic designer posterized the photograph to create a bold, pop art-style image";
    - posterise [Brit]

Derived forms: posterizing, posterizes, posterized

Encyclopedia: Posterize