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Protanopic observers show nearly normal color constancy with natural reflectance spectra

Published online by Cambridge University Press:  05 April 2005

RIGMOR C. BARAAS ,
DAVID H. FOSTER ,
KINJIRO AMANO  and
SÉRGIO M.C. NASCIMENTO
RIGMOR C. BARAAS
Affiliation:
Visual and Computational Neuroscience Group, University of Manchester Institute of Science and Technology, Manchester, UK
DAVID H. FOSTER
Affiliation:
Visual and Computational Neuroscience Group, University of Manchester Institute of Science and Technology, Manchester, UK
KINJIRO AMANO
Affiliation:
Visual and Computational Neuroscience Group, University of Manchester Institute of Science and Technology, Manchester, UK
SÉRGIO M.C. NASCIMENTO
Affiliation:
Department of Physics, Gualtar Campus, University of Minho, Braga, Portugal
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Abstract

The ability of color-deficient observers to discriminate between illuminant changes and surface-reflectance changes in a scene was tested with natural and Munsell reflectance spectra. To avoid the confounding effects of spatial structure, stimuli were simulations of Mondrian-like colored patterns, presented on a computer-controlled color monitor. Protanopes performed less well than normal trichromats, regardless of the type of reflectance spectra, but they were least disadvantaged with patterns comprising reflectance spectra drawn from urban and rural scenes, more characteristic of the natural environment.

Keywords

ProtanopesColor constancySurface-color judgmentsCone-excitation ratiosNatural reflectance spectra
Type
Research Article
Information
Visual Neuroscience , Volume 21 , Issue 3 , May 2004 , pp. 347 - 351
Copyright
© 2004 Cambridge University Press

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