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Chromatic adaptation and π mechanisms
Author(s) -
Walraven Jan,
Werner John S.
Publication year - 1982
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.5080070112
Subject(s) - chromaticity , achromatic lens , chromatic scale , luminance , chromatic adaptation , hue , stimulus (psychology) , optics , brightness , physics , mathematics , psychology , cognitive psychology
Adaptive hue shifts of the achromatic point were measured in conditions in which a test field was presented as a flashed increment on steady chromatic backgrounds. The variables investigated were background chromaticity, luminance, and stimulus contrast. The results could be accounted for quantitatively by a mechanistic model with the following properties: discounting of the (steady) background, or ac‐coupled signal processing; cone spectral sensitivities as estimated by Vos and Walraven; and receptor‐specific gain controls that have the same action spectra and gain characteristics as Stiles' π 5 , π 4 , and (modified) π 1 mechanisms.