Von Kries coefficient law
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The von Kries coefficient law in color adaptation describes the relationship between the illuminant and the human visual system sensitivity.[1][2][3] The law accounts for the approximate color constancy in the human visual system.[4] It is the oldest and most widely used law to quantify color adaptation,[5] and is used widely in the field of vision and chromatic adaptation.
The von Kries coefficient law compensates for the illumination change using a purely diagonal scaling of the cone absorptions.[6] While the law does not provide a precise indication of the correction, it typically provides a reasonable approximation.