A Novel Method of Color Appearance Simulation Using Achromatic Point Locus With Lightness Dependence

I-Perception
Ichiro Kuriki

Abstract

The purpose of the present study is to propose a simple algorithm for color appearance simulation under a color illuminant. Achromatic point is a chromaticity of rays that appear neither red nor green, neither blue nor yellow under a given illuminant condition. Saturation and hue of surface colors are evaluated with respect to the achromatic point of the same lightness, while the achromatic point under a colored illuminant depends on the lightness tested. We previously found that this achromatic point locus can be simply approximated as a line with a parallel offset from the lightness axis of CIE LAB space normalized to daylight. We propose a model that applies shifts in the lightness direction after applying hue/saturation shifts using the cone-response (von Kries) transformation under an iso-lightness constraint, such that achromatic points would be aligned with the lightness axis in the CIE LAB space under daylight normalization. We tested this algorithm, which incorporates evaluation of color appearance in different lightness levels, using #theDress image. Resemblance between our simulation and subjective color-matching results implies that human color vision possibly processes shifts in color and lightness independently, a...Continue Reading

References

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Feb 2, 2017·Journal of Vision·Christoph WitzelJ Kevin O'Regan

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Citations

Sep 12, 2018·I-Perception·Mark W GreenleeChristoph Wagner

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Methods Mentioned

BETA
chip
chips

Software Mentioned

MATLAB
CIELAB
RLAB

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