Definition of posterizing:
(v) :
(transitive) (Canada, US, basketball, slang) To score a slam dunk in basketball against (one or more opposing players) by leaping over them; also (by extension, sports, slang), to score a goal, a point, etc., in some other sport against (one or more opposing players) in a spectacular manner.
(v) :
(transitive) (graphic design, photography) To inadvertently or intentionally reduce the number of colours in (a photograph or other image), changing a continuous gradation of tone to several regions of fewer tones with abrupt changes from one tone to another.
(v) :
(intransitive, graphic design, photography) To inadvertently or intentionally reduce the number of colours in a photograph or other image, changing a continuous gradation of tone to several regions of fewer tones with abrupt changes from one tone to another.