ah, the chromaticity of your eyes

Took some colorimeter measurements of a Chuck Close yesterday, in order to calculate ?E.  Unfortunately, the original measurements were CIE Yxy, and as far as I can tell the normal calculation is from Lab.  In searching for a conversion, came upon a cool website on space, which includes the conversion formulas, and an online color calculator.  The Lab calculation is:

(from another site with good color calculations)



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