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a perceptually uniform lightness prediction that is derived from luminance , but discards the and , of the CIE XYZ color space. Notice this appears similar in perceived lightness to the original color image. Luma is a gamma-encoded luminance component of some video encoding systems such as and . It is roughly similar, but differs at high chroma, deviating most from an achromatic signal such as linear luminance or non-linear lightness . HSL and HSV are neither perceptually uniform, nor uniform

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