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YCbCr

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. The prime (') on the Y is to distinguish the luma from luminance, meaning that light intensity is non-linearly encoded using gamma.Y'CbCr is not an absolute color space, it is a way of encoding RGB information. The actual color displayed depends on the actual RGB colorants used to display the signal. Therefore a value expressed as Y'CbCr is only predictable if standard RGB colorants or an ICC profile are used.