Chapter

The Perception of Quality: Visual Color

Stephen Handel

in Perceptual Coherence

Published in print May 2006 | ISBN: 9780195169645
Published online September 2007 | e-ISBN: 9780199786732 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780195169645.003.0007
 The Perception of Quality: Visual Color

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The color stimulus reaching the observer is the result of the source illumination being filtered by the specular and surface reflectance. Both the illumination and reflectance can be represented by continuous linear functions that yield a single color image equation for each type of cone. There are more unknowns than the three data points from the cone absorptions, so that many assumptions are necessary to achieve constancy. Color constancy is not matching absorptions in the rods and three cone systems from two surfaces that are illuminated differently. Instead, asymmetric color matching is the estimation of surface reflectances from properties of the entire scene based on ratios of absorptions in different parts of the field. Color constancy is not high, even though observers make use of many different cues.

Keywords: asymmetric color matching; color constancy; color image equations; cone absorptions; illumination; multiple cues; source filter models; specular reflection; surface reflection

Chapter.  16009 words.  Illustrated.

Subjects: Cognitive Psychology

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