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YCbCr
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YCbCr

YCbCr is a colour space used in video systems. Y is the luminance component and Cb and Cr the chrominance components. It is often confused with the YUV colour space, and sometimes the terms YCbCr and YUV are used interchangeably, leading to confusion. YCbCr is sometimes abbreviated to YCC.

YCbCr signals are created from an original RGB (red, green and blue) source as follows.

Y  = + 0.299R    + 0.587G    + 0.114B
Cb = +(B - Y) / 1.772 + 0.5
   = - 0.168736R - 0.331264G + 0.5B      + 0.5
Cr = +(R - Y) / 1.402 + 0.5
   = + 0.5R      - 0.418688G - 0.081312B + 0.5

Here, R, G and B are assumed to range from 0 to 1, with 0 representing the minimum intensity and 1 the maximum.

YCbCr was defined in the ITU-601 (formerly CCIR-601) standard for use with digital component video. The same colour space for use in analogue component video was called YPbPr, although the term YCbCr is often used for both systems.