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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 18, Iss. 10 — Oct. 1, 2001
  • pp: 2419–2429

Increments and decrements in color constancy

Karl-Heinz Bäuml  »View Author Affiliations

JOSA A, Vol. 18, Issue 10, pp. 2419-2429 (2001)

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The present study examines whether increment–decrement asymmetries reported in a number of recent center–surround situations occur in more complex images as well. Subjects saw the CRT simulation of a whole uniformly illuminated array of foreground surfaces presented against a large background surface and, for a number of different viewing contexts, made achromatic settings over a wide range of luminance values. Three results emerged. First, subjects’ achromatic loci did not fall on a single straight line in color space but rather fell on two separate lines intersecting at some point in this space. Second, the intersection points were not identical to but dependent largely on background color and showed only small effects of foreground colors. Third, cone signals that were decremental relative to the intersection point were more responsive to illuminant changes than cone signals that were incremental, the latter additionally showing some variation with foreground colors. The results are interpreted in terms of increment–decrement asymmetries. They suggest that these asymmetries occur in more complex images as well.

© 2001 Optical Society of America

OCIS Codes
(330.5020) Vision, color, and visual optics : Perception psychology

Original Manuscript: October 31, 2000
Revised Manuscript: March 12, 2001
Manuscript Accepted: March 21, 2001
Published: October 1, 2001

Karl-Heinz Bäuml, "Increments and decrements in color constancy," J. Opt. Soc. Am. A 18, 2419-2429 (2001)

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