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Judgments about the intensity of the illumination are influenced by the association between colour and luminance in the scene

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Title Judgments about the intensity of the illumination are influenced by the association between colour and luminance in the scene
Title of Series The Sixth European Conference on Colour in Graphics, Imaging and Vision (CGIV 2012)
Part Number 24
Number of Parts 31
Author Brenner, Eli
Nascimento, Sérgio
License CC Attribution - NoDerivatives 2.0 UK: England & Wales:
You are free to use, copy, distribute and transmit the work or content in unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
DOI 10.5446/31457
Publisher River Valley TV
Release Date 2012
Language English

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Subject Area Information technology
Abstract In order to judge whether a surface that one is looking at is white or grey, one needs to consider the intensity of the illumination. We here show that people do not simply use the maximal luminance in the light from the scene as a measure for the intensity of the illumination but also consider how luminance and chromaticity are associated. We suggest that they take into account that there are physical limitations to the luminance that reflecting surfaces can achieve at high chromatic saturation. These limitations arise because chromaticity is the result of surfaces selectively reflecting light of different wavelengths, so that the luminance of the illumination must be higher than that of the brightest patch in the scene if that patch is not white.

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