To make sense of some of the complexities of the new Ultra High Definition (UHD—4K or 2160p) high dynamic range (HDR) sets, you have to appreciate some of the simplifications that have long been a part of standard dynamic range (SDR) high definition television.
Many characteristics of a video image depend on its brightness or, more accurately, luminance. For example, the quality of the color might vary between an image that’s 20% of a set’s peak brightness capability and one that’s 90%. But the color sensitivity to varying brightness levels have generally been given little attention in the consumer HD/SDR world...
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