Title: Lines of constant hue do not always converge on grey
Authors: Ekroll, Vebj√∂rn
Faul, F
Niederee, R
Richter, E #
Issue Date: Aug-2002
Publisher: Pion Ltd.
Host Document: Perception vol:31 pages:15-15
Conference: European Conference on Visual Perception edition:25 location:Glasgow date:25-29 August 2002
Abstract: Current theories of colour vision assume the existence of a uniquely defined neutral point in chromaticity space. It is generally thought that this point satisfies several criteria simultaneously. One of these criteria is that it is perceived as achromatic. A further criterion shared by most theories is the structural assumption that lines of constant hue converge on the neutral point. The basic assumption that these two criteria coincide is clearly true for isolated spots of light presented in darkness, and it is usually taken for granted that this coincidence generalises to more complex visual stimuli. We show that this is not the case. Our experiments with simple equiluminant infield-surround stimuli revealed that the point in chromaticity space which appears grey is clearly different from the point on which lines of constant hue converge. This apparently paradoxical finding is incompatible with traditional three-dimensional conceptions of perceptual colour space in terms of hue, saturation, and brightness. In our situation 'desaturation' along lines of constant hue may best be described as a 'veiling with the colour of the surround' instead of a 'veiling with white' [Hering, 1920/1964 Outlines of a Theory of the Light Sense (Cambridge, MA: Harvard University Press); English translation by L M Hurvich, D Jameson]. This indicates that, as in the case of perceptual transparency, two layers of colour are perceived
ISSN: 0301-0066
Publication status: published
KU Leuven publication type: IMa
Appears in Collections:Non-KU Leuven Association publications
# (joint) last author

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