Although video is displayed inRGB colorspace, as a combination of Red, Green, and Blue values, it's generally stored digitally in a compressedYUV colorspace of some kind. In order to ensure that the RGB image displayed is as close as possible to the original, standard Colorimetry systems are used to convert from one to the other.

The two most common Colorimetry standards are defined byITU standards, based on systems developed in various countries. These standards are commonly referred to as Rec. 709 and Rec. 601, which are short for ITU-R BT.709 and ITU-R BT.601. In order for a signal to be reproduced correctly on a display, it needs to be decoded with a device using the same colorimetry as the encoder. Most modern hardware and software is capable of performing both Rec. 709 and Rec. 601 Color conversions.

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