While luma is added generally encountered, (photometric) luminance is sometimes acclimated in video engineering if apropos to the accuracy of a monitor. The blueprint acclimated to account luminance uses coefficients based on the CIE blush analogous functions and the accordant accepted chromaticities of red, green, and dejected (e.g., the aboriginal NTSC primaries, SMPTE C, or Rec. 709). For the Rec. 709 primaries, the beeline combination, based on authentic colorimetric considerations and the analogue of luminance is:
Y = 0.2126 R + 0.7152 G + 0.0722 B
The blueprint acclimated to account luma in the Rec. 709 blueprint arbitrarily aswell uses these aforementioned coefficients, but with gamma-compressed components:
Y' = 0.2126 R' + 0.7152 G' + 0.0722 B', area the prime attribute ' denotes gamma correction.
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