In video, luma, sometimes alleged luminance, represents the accuracy in an angel (the "black-and-white" or achromatic allocation of the image). Luma is about commutual with chrominance. Luma represents the achromatic angel after any color, while the blush apparatus represent the blush information. Converting R'G'B' sources (such as the achievement of a 3CCD camera) into luma and blush allows for blush subsampling: because animal eyes has bigger spatial acuteness to luminance ("black and white") differences than bright differences, video systems can abundance bright advice at lower resolution, optimizing perceived detail at a accurate bandwidth.
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