two different stimuli with thereby different XYZ tristimulus values create an identical color appearance. If the color temperature of the illuminating light source changes, so do the spectral power distribution and thereby the XYZ tristimulus values of the light reflected from the white paper; the color appearance, however, stays the same (white).

Hue appearance

Several effects change the perception of hue by a human observer:

* Bezold-Brücke hue shift: The hue

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