February 2016
Volume 16, Issue 4
Open Access
OSA Fall Vision Meeting Abstract  |   February 2016
Natural Scenes are a Possible Source of Luminance-dependent Long-term Chromatic Adaptation
Author Affiliations
  • Alex Kale
    University of Washington
  • Joris Vincent
    University of Washington
  • Steven L. Buck
    University of Washington
Journal of Vision February 2016, Vol.16, 28-29. doi:10.1167/16.4.25
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      Alex Kale, Joris Vincent, Steven L. Buck; Natural Scenes are a Possible Source of Luminance-dependent Long-term Chromatic Adaptation. Journal of Vision 2016;16(4):28-29. doi: 10.1167/16.4.25.

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Abstract

Our recent psychophysical work (ref 1) reveals different red-green balance points when long-wavelength stimuli appear dark in a bright context than when the same physical stimuli appear bright in a dark context. Dark stimuli look greener; bright stimuli look redder. This suggests a difference in L- and M-cone signal weights in processing of dark and bright stimuli.

The red/green shift might arise from adaptation to regularities in the environment. Past work shows that L/M weights shift with long-term adaptation both under experimental conditions (ref 2) and naturally over the lifespan (ref 3). Perhaps long-term adaptation of L/M weights occurs independently for bright and dark stimuli, driven by luminance-dependent differences in chromatic content. Thus, in the natural world, an abundance of L-cone stimulation in dark regions, or at lower luminances, might be compensated by stronger weighting of M-cone signals than in bright portions, or at higher luminances. We examine what luminance-chromaticity interactions exist within natural scenes.

Our analyses show some regularities in the natural world that could support luminance-dependent chromatic adaptation in the direction consistent with the observed psychophysical shift of red-green balance. Analysis of 238 natural scenes from calibrated databases reveals that bright clear sky is a strong and ubiquitous driver of the predicted interaction. On average, pixels in the most luminous quartile were shifted towards smaller L/M ratio compared to those in the least luminous quartile. This luminance-chromaticity interaction was less common and weaker for natural scenes not containing sky.

Buck S. L., Delawyer T. 2014 Dark vs. bright equilibrium hues: rod and cone biases Journal of the Optical Society of America A 31 4 1 [CrossRef]
Neitz J., Carroll J., Yamauchi Y., Neitz M., Williams D. R. 2002 Color perception is mediated by a plastic neural mechanism that is adjustable in adults Neuron 35 4 783 [CrossRef] [PubMed]
Werner J. S., Schefrin B. E. 1993 Loci of achromatic points across the life span Journal of the Optical Society of America A 10 1509 [CrossRef]
Footnotes
 Supported by UW Royalty Research Fund grant #A96870.
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