Volume 5, Number 1, Article 2, Pages 20-27 doi:10.1167/5.1.2 http://journalofvision.org/5/1/2/ ISSN 1534-7362
Luminance–color correlation is not used to estimate the color of the illumination
Jeroen J. M. Granzier
Department of Neuroscience, Erasmus MC, Rotterdam, The Netherlands
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Eli Brenner
Department of Neuroscience, Erasmus MC, Rotterdam, The Netherlands
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Frans W. Cornelissen
Laboratory for Experimental Ophthalmology & BCN Neuro-imaging Center, School for Behavioural and Cognitive Neurosciences, University of Groningen, The Netherlands
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Jeroen B. J. Smeets
Department of Neuroscience, Erasmus MC, Rotterdam, The Netherlands
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Abstract

Humans can identify the colors of objects fairly consistently, despite considerable variations in the spectral composition of the illumination. It has been suggested that the correlation between luminance and color within a scene helps to disentangle the influences of illumination and reflectance, because the surfaces that reflect the light of the illuminant well will normally be bright. Because the reliability of the luminance-color correlation as an indicator of the chromaticity of the illuminant depends on the number of surfaces that are considered, we expected the correlation to be determined across large parts of the scene. To examine whether this is so, we compared different scenes with matched luminance and chromaticity, but in which the correlation between luminance and chromaticity was manipulated locally. Our results confirm that there is a bias in perceived color away from the chromaticity of bright surfaces. However, the results show that only the correlation within about 1° of the target is relevant. Thus, it is unlikely that the visual system uses the correlation between luminance and color to explicitly determine the chromaticity of the illuminant. Instead, this correlation is presumably implicitly considered in the way that the color contrast at borders is determined.

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History
Received July 2, 2004; published January 25, 2005
Citation
Granzier, J. J. M., Brenner, E., Cornelissen, F. W., & Smeets, J. B. J. (2005). Luminance–color correlation is not used to estimate the color of the illumination. Journal of Vision, 5(1):2, 20-27, http://journalofvision.org/5/1/2/, doi:10.1167/5.1.2.
Keywords
color vision, chromatic induction, color constancy, cone-excitation ratios
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