YCbCr
Family of digital colour spaces / From Wikipedia, the free encyclopedia
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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 video and digital photography systems. Y′ is the luma component and CB and CR are the blue-difference and red-difference chroma components. Y′ (with prime) is distinguished from Y, which is luminance, meaning that light intensity is nonlinearly encoded based on gamma corrected RGB primaries.
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![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Barns_grand_tetons_YCbCr_separation.jpg/640px-Barns_grand_tetons_YCbCr_separation.jpg)
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. Nevertheless that rule does not apply to P3-D65 primaries used by Netflix with BT.2020-NCL matrix, so that means matrix was not derived from primaries, but now Netflix allows BT.2020 primaries (since 2021).[1] The same happens with JPEG: it has BT.601 matrix derived from System M primaries, yet the primaries of most images are BT.709.