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The [https://en.wikipedia.org/wiki/Contrast_ratio contrast ratio] of a TV screen is the ratio of the [https://en.wikipedia.org/wiki/Luminance luminance] of white and black. A high contrast ratio is desirable. In particularBecause TVs can mostly achieve the same brightness of white, deep blacks give the contrast ratio really represents how dark black will be, and a good colourhigher number will mean darker blacks instead of grey.<ref>http://ca.rtings.com/tv/tests/movies/dark-scene/contrast-ratio</ref>