August 2012
Volume 12, Issue 9
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2012
Simultaneous contrast and gamut relativity in brightness and darkness perception
Author Affiliations
  • Tony Vladusich
    Biology Department, Brandeis University
Journal of Vision August 2012, Vol.12, 106. doi:10.1167/12.9.106
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      Tony Vladusich; Simultaneous contrast and gamut relativity in brightness and darkness perception. Journal of Vision 2012;12(9):106. doi: 10.1167/12.9.106.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Simultaneous contrast refers to the respective brightening (darkening) of physically identical image regions surrounded by neighboring regions of low (high) luminance. A common method of measuring the strength of simultaneous contrast is color matching, in which subjects adjust the luminance of a target region to achieve an achromatic color match with another region. A recent model of model of achromatic color perception suggests that such color matches are relative, rather than absolute, reflecting minimal perceptual distances between colors represented as points in a two-dimensional (2D) color space composed of brightness and darkness dimensions (brightness-darkness space). Here we present psychophysical data supporting this model, and show that achromatic colors are computed as the vector sum of weighted luminance and contrast information in brightness-darkness space. According to the model, simultaneous contrast restricts the color gamut available to subjects performing a color matching task to different 1D slices of brightness-darkness space, with each slice depending uniquely on the luminance values in surrounding image regions. We term this concept gamut relativity.

Meeting abstract presented at VSS 2012

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