YCbCr

A visualization of YCbCr color space
The CbCr plane at constant luma Y′=0.5
A color image and its Y′, CB and CR components. The Y′ image is essentially a greyscale copy of the main image.

YCbCr, Y′CbCr, or Y Pb/Cb Pr/Cr, also written as YCBCR or Y′CBCR, is a family of color spaces used as a part of the color image pipeline in digital video and photography systems.

Y′ is the luma component and CB and CR are the blue-difference and red-difference chroma components. Luma Y′ (with prime) is distinguished from luminance Y, meaning that light intensity is nonlinearly encoded based on gamma corrected RGB primaries.

Y′CbCr color spaces are defined by a mathematical coordinate transformation from an associated RGB primaries and white point. If the underlying RGB color space is absolute, the Y′CbCr color space is an absolute color space as well; conversely, if the RGB space is ill-defined, so is Y′CbCr. The transformation is defined in equations 32, 33 in ITU-T H.273.[1]

  1. ^ "H.273: Coding-independent code points for video signal type identification". www.itu.int. Retrieved 2025-01-06.

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