Spatial dependence of color assimilation by the watercolor effect

Frédéric Devinck, Peter B. Delahunt, Joseph L. Hardy, Lothar Spillmann, John S Werner

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Color assimilation with trichromatic contours was quantified for spatial extents ranging from von Bezold-type color assimilation to the watercolor effect. The magnitude and direction of assimilative hue change was measured as a function of the width of a rectangular stimulus. Assimilation was quantified by hue cancellation. Large hue shifts were required to null the color of stimuli ≤ 9.3 min of arc in width, with an exponential decrease for stimuli increasing up to 7.4 deg. When stimuli were viewed through an achromatizing lens, the magnitude of the assimilation effect was reduced for narrow stimuli, but not for wide ones. These results demonstrate that chromatic aberration may account, in part, for color assimilation over small, but not large, surface areas.

Original languageEnglish (US)
Pages (from-to)461-468
Number of pages8
Issue number4
StatePublished - 2006

ASJC Scopus subject areas

  • Psychology(all)
  • Experimental and Cognitive Psychology


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