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Brill, Michael H.
Color research and application, December 2022, 2022-12-00, 20221201, Letnik: 47, Številka: 6Journal Article
In my 1996 article on units of tristimulus values, I used as a definitional equation Jozef Cohen's Q = A′N, where N is a radiometric function of k wavelengths and Q is a column vector comprising N's associated tristimulus values. With Cohen, I took as Matrix A (having no units) a set of three column vectors comprising color‐matching functions. The relation Q = A′N then forced Q to have dimensions of power, which was inconsistent with the dimensionlessness of matrix A. Besides this problem, calling A′N the tristimulus values of N still left them in an unspecified basis, so you could get a wide variety of Q vectors from a single N vector by changing the basis of A. Simply specifying Q = A′N did not supply enough information to specify tristimulus values uniquely. I now propose to define Q = (A′ P)−1 A′ N, where k‐by‐3 matrix P contains the (unscaled) spectra of the primaries. Using this definition resolves both the above problems.
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