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tristimulus values

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tristimulus values [trī′stim·yə·ləs ‚val·yüz]
(optics)
The magnitudes of three standard stimuli needed to match a given sample of light.


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While the x, y and z tristimulus values are useful for defining color, they do not allow for easy visualization of color.
Additional discussion of CIELAB values from XYZ tristimulus values determination can be found in reference 19.
The tristimulus values X, Y, Z are calculated by combining the spectral power distribution D([lambda]) of the illuminant, the reflectance R([lambda]) of the object and the observer color matching functions [~.
 
 
 
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