A single-pass luminance-gradient filter tuned to be almost free. Blurs some genuine detail, and shipped nearly everywhere because it needs nothing from the renderer but a finished frame.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
Colour is the family; a dashed line is the second member of it.
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approximatesis a cheaper stand-in for Morphological Anti-Aliasingone heuristic pass instead of real pattern classification