4:4:4

A&V
Similar to 4:2:2 except that for every four luminance samples, the color channels are also sampled four times.
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HD
Defines standard definition video signals, where all signals (usually R,G,B but also Y, R-Y,B-Y) are sampled at 13.5 MHz. This terminology has come into common usage to describe both high definition and standard definition systems where sampling is done on the RGB components of a video signal. Also see 22:22:22

Audio and video glossary. 2014.

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