From: Gamut relativity: A new computational approach to brightness and lightness perception
Journal of Vision. 2013;13(1):14. doi:10.1167/13.1.14
Figure Legend:
Illustration of postulates III–V of gamut relativity. Postulates III–V relate to: (III) the existence of a correspondence
theorem that solves the problem of achromatic color constancy; (IV) the interpretation of brightness and lightness as
computationally defined modes; and (V) the interpretation of anchoring as a scission process. (A) Brightness mode: A
global blackness anchor is applied to all squares in the depicted arrangement; namely, achromatic surface colors with
relatively high luminance, as in the set A (red dots), and relatively low luminance, as in the set B (blue dots). (B)
Lightness mode: Local blackness anchoring translates the achromatic surface colors in the set B with low luminance to
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induced by a change in the depth relationship between upper and lower squares, depicting differential illumination. It is