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Formulation of a nonlinear model of chromatic adaptation for a light‐gray background
Author(s) -
Takahama Kotaro,
Sobagaki Hiroaki,
Nayatani Yoshinobu
Publication year - 1984
Publication title -
color research and application
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.393
H-Index - 62
eISSN - 1520-6378
pISSN - 0361-2317
DOI - 10.1002/col.5080090210
Subject(s) - luminance , chromatic adaptation , chromatic scale , colored , gray (unit) , optics , perception , adaptation (eye) , mathematics , color vision , contrast (vision) , reflectivity , artificial intelligence , psychology , computer vision , computer science , statistics , physics , medicine , materials science , neuroscience , composite material , radiology
The nonlinear model of chromatic adaptation of Nayatani, Takahama, and Sobagaki 1–3 is extended to apply to an adapting field with a light‐gray background. Its formulation and computational procedure are described in detail. Using the extended formulation, the following adaptation effects are predicted for a background reflectance of 50%: )1( the chromatic‐adaptation effect between standard illuminants D 65 and A, )2( the change of colorfulness of colored samples )the Hunt effect(, )3( the change of bright and dark contrast of nonselective samples )the Stevens effect(, and )4( the color perception of nonselective samples under a colored adapting illumination )the Helson‐Judd effect(. Effects )2( and )3( are observed by changing the adapting luminance. The effect of changing the background reflectance from 0.20 to 0.50 is discussed with respect to prediction of the above four effects. This change is especially significant in the Helson‐Judd effect but less so in the others.