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Lightness dependence of achromatic loci in color-appearance coordinates

Shifts in the appearance of color under different illuminant chromaticity are known to be incomplete, and fit nicely with a simple linear transformation of cone responses that aligns the achromatic points under two illuminants. Most chromaticity-transfer functions with von-Kries-like transformations...

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Autor principal: Kuriki, Ichiro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4322615/
https://www.ncbi.nlm.nih.gov/pubmed/25713543
http://dx.doi.org/10.3389/fpsyg.2015.00067
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author Kuriki, Ichiro
author_facet Kuriki, Ichiro
author_sort Kuriki, Ichiro
collection PubMed
description Shifts in the appearance of color under different illuminant chromaticity are known to be incomplete, and fit nicely with a simple linear transformation of cone responses that aligns the achromatic points under two illuminants. Most chromaticity-transfer functions with von-Kries-like transformations use only one set of values to fit the color shifts from one illuminant to another. However, an achromatic point shifts its chromaticity depending on the lightness of the test stimulus. This lightness dependence of the achromatic-point locus is qualitatively similar to a phenomenon known as the Helson-Judd effect. The present study suggests that the lightness dependency of achromatic points appears to be a general trend, which is supported by the results from deriving the optimal von-Kries coefficients for different lightness levels that best fit the color shifts under a different illuminant chromaticity. Further, we report that such a lightness dependence of the achromatic-point loci can be represented simply as a straight line in coordinates defined using color-appearance models such as CIECAM when normalized for daylight.
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spelling pubmed-43226152015-02-24 Lightness dependence of achromatic loci in color-appearance coordinates Kuriki, Ichiro Front Psychol Psychology Shifts in the appearance of color under different illuminant chromaticity are known to be incomplete, and fit nicely with a simple linear transformation of cone responses that aligns the achromatic points under two illuminants. Most chromaticity-transfer functions with von-Kries-like transformations use only one set of values to fit the color shifts from one illuminant to another. However, an achromatic point shifts its chromaticity depending on the lightness of the test stimulus. This lightness dependence of the achromatic-point locus is qualitatively similar to a phenomenon known as the Helson-Judd effect. The present study suggests that the lightness dependency of achromatic points appears to be a general trend, which is supported by the results from deriving the optimal von-Kries coefficients for different lightness levels that best fit the color shifts under a different illuminant chromaticity. Further, we report that such a lightness dependence of the achromatic-point loci can be represented simply as a straight line in coordinates defined using color-appearance models such as CIECAM when normalized for daylight. Frontiers Media S.A. 2015-02-10 /pmc/articles/PMC4322615/ /pubmed/25713543 http://dx.doi.org/10.3389/fpsyg.2015.00067 Text en Copyright © 2015 Kuriki. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Psychology
Kuriki, Ichiro
Lightness dependence of achromatic loci in color-appearance coordinates
title Lightness dependence of achromatic loci in color-appearance coordinates
title_full Lightness dependence of achromatic loci in color-appearance coordinates
title_fullStr Lightness dependence of achromatic loci in color-appearance coordinates
title_full_unstemmed Lightness dependence of achromatic loci in color-appearance coordinates
title_short Lightness dependence of achromatic loci in color-appearance coordinates
title_sort lightness dependence of achromatic loci in color-appearance coordinates
topic Psychology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4322615/
https://www.ncbi.nlm.nih.gov/pubmed/25713543
http://dx.doi.org/10.3389/fpsyg.2015.00067
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