Document Detail

Luminance-color correlation is not used to estimate the color of the illumination.
MedLine Citation:
PMID:  15831063     Owner:  NLM     Status:  MEDLINE    
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 degree 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.
Jeroen J M Granzier; Eli Brenner; Frans W Cornelissen; Jeroen B J Smeets
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-01-25
Journal Detail:
Title:  Journal of vision     Volume:  5     ISSN:  1534-7362     ISO Abbreviation:  J Vis     Publication Date:  2005  
Date Detail:
Created Date:  2005-04-15     Completed Date:  2006-01-17     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  101147197     Medline TA:  J Vis     Country:  United States    
Other Details:
Languages:  eng     Pagination:  20-7     Citation Subset:  IM    
Department of Neuroscience, Erasmus MC, Rotterdam, The Netherlands.
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MeSH Terms
Color Perception / physiology*
Retinal Cone Photoreceptor Cells / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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