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.
YCbCr is sometimes abbreviated to YCC. Y’CbCr is often called YPbPr when used for analog component video, although the term Y’CbCr is commonly used for both systems, with or without the prime.
Y’CbCr is often confused with the YUV color space, and typically the terms YCbCr and YUV are used interchangeably, leading to some confusion; when referring to signals in video or digital form, the term “YUV” mostly means “YCbCr”. YCbCr is normally used with 4:2:2 chroma subsampling.