What are the calculations used to convert spectrophotometric spectral data to density, CIE XYZ, and RGB variables/values?
All of these calculations share the same basic structure. You take the spectral data, weight it (multiply) by a set of responsivity functions, and then integrate to get the result. In the case of density, you do a logarithmic transformation after the integration and in the case of RGB, you have to do a nonlinear transformation (often) to account for display properties. The weighting functions are different in each case. The best way to learn about these calculations is through a good text such as Berns’ “Principles of Color Technology, 3rd Ed.” and Hunt’s “The Reproduction of Colour, 6th Ed.”.
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