Y, R-Y, B-Y

Color difference signal designation. Y corresponds to the luminance signal, R-Y corresponds to the red minus luminance signal, and B-Y corresponds to the blue minus luminance signal. These signals are derived as follows:
• Y = 0.3 Red + 0.59 Green + 0.1 Blue
• R-Y = 0.7 Red + 0.59 Green - 0.1 Blue
• B-Y = 0.89 Blue - 0.59 Green - 0.3 Red
Terminology to describe the luminance (Y) and color difference signals (R-Y) and (B-Y) of component video. Y is luminance information and the R-Y and B-Y signals together provide the color information. These signals, derived from the original RGB source, are used in most video systems as a bandwidth reduction technique.

Audio and video glossary. 2014.

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