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→Contrast Ratio
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. Because TVs can mostly achieve the same brightness of white, the contrast ratio really represents how dark black will be, and a higher number will mean darker blacks instead of a washed-out grey. Contrast is difficult to measure and manufacturers exaggerate so check the findings of reviewers.<ref>http://ca.rtings.com/tv/tests/movies/dark-scene/contrast-ratio</ref>
On your TV, contrast controls the bright parts of the image. Set this too high, and you’ll lose wash out detail in clouds, snow, etc. Set it too low, and the image will look flat and dark.
Different types of TV have different contrast profiles. [http://www.cnet.com/ CNET] recommends:<ref>http://www.cnet.com/news/contrast-ratio-or-how-every-tv-manufacturer-lies-to-you/</ref>