| http://www.w3.org/ns/prov#value | - ctors: (1, 1.64, 1.044) as diagonal entries of D, and (1, 0.593, 1.017) as the diagonal entries for H. For definiteness, D??M??H can be finally subjected to a scaling, so that (R,G,B)=(1,1,1) maps to a vector with maximum element 1.As an auxiliary formula for the gray level of an (R,G,B)-colour, take the Y-value (also sometimes called luminance) of the official NTSC formula; i.e. if r is a vector
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