Color and lightness constancy in different perceptual tasks |
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Authors: | Nicola Schneider Christoph von Campenhausen |
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Affiliation: | Zoologisches Institut, Johannes Gutenberg Universit?t, D-55122 Mainz, Germany, DE
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Abstract: | Color and lightness constancy with respect to changing illumination was studied with three different perceptual tasks: ranking
of colored papers according (1) to their lightness and (2) to their chromatic similarity in photopic, mesopic, and scotopic
states of adaptation, and (3) recognition of remembered colored papers after changes of illumination in photopic vision. Constancy
was found in the second task, only. Excitations of light receptors and luminance channels were computed to simulate the empirical
rank orders. Results of the first task can be predicted with the hypothesis that luminance channels are activated, if lightness
is asked for. Sequences arranged with respect to chromatic similarity were found independent of the illuminant spectra, even
if the calculated rank orders of cone excitation were changed in the altered illumination.
Received: 4 October 1997 / Accepted in revised form: 26 August 1998 |
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