Color coordinates XYZ |
  
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Color coordinates XYZ |
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The color coordinates X,Y,Z are computed according to DIN 5033.
The following steps are taken:
In case of reflectance or transmittance spectra the illuminant D65 with relative spectral distribution S (as given in the table below) is used to compute the intermediate quantity k:
The tristimulus values X, Y and Z are calculated according to the following equations:
where τ is the transmittance of the layer stack. The color-matching functions are given below.
The given expressions are for 2° observation. For 10° the corresponding values for the color-matching functions are taken. These are also given below.