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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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2015-02-01
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| Series: | Frontiers in Psychology |
| Subjects: | |
| Online Access: | http://journal.frontiersin.org/Journal/10.3389/fpsyg.2015.00067/full |
| _version_ | 1818137075084427264 |
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| author | Ichiro eKuriki |
| author_facet | Ichiro eKuriki |
| author_sort | Ichiro eKuriki |
| collection | DOAJ |
| 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 different illuminant chromaticities. 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. |
| first_indexed | 2024-12-11T09:50:32Z |
| format | Article |
| id | doaj.art-c0400aa9c1ca4194ada490449c07a922 |
| institution | Directory Open Access Journal |
| issn | 1664-1078 |
| language | English |
| last_indexed | 2024-12-11T09:50:32Z |
| publishDate | 2015-02-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Psychology |
| spelling | doaj.art-c0400aa9c1ca4194ada490449c07a9222022-12-22T01:12:25ZengFrontiers Media S.A.Frontiers in Psychology1664-10782015-02-01610.3389/fpsyg.2015.00067122361Lightness dependence of achromatic loci in color-appearance coordinatesIchiro eKuriki0Research Institute of Electrical Communication, Tohoku UniversityShifts 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 different illuminant chromaticities. 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.http://journal.frontiersin.org/Journal/10.3389/fpsyg.2015.00067/fullColor Visioncolor constancyachromatic pointlightness dependencecorresponding colors. |
| spellingShingle | Ichiro eKuriki Lightness dependence of achromatic loci in color-appearance coordinates Frontiers in Psychology Color Vision color constancy achromatic point lightness dependence corresponding colors. |
| 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 | Color Vision color constancy achromatic point lightness dependence corresponding colors. |
| url | http://journal.frontiersin.org/Journal/10.3389/fpsyg.2015.00067/full |
| work_keys_str_mv | AT ichiroekuriki lightnessdependenceofachromaticlociincolorappearancecoordinates |