Two Neutral White Illumination Loci Based on Unique White Rating and Degree of Chromatic Adaptation
Two Neutral White Illumination Loci Based on Unique White Rating and Degree of Chromatic Adaptation
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DOI：
10.1080/15502724.2017.1385400
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发表时间：
2018-04
期刊：
影响因子：
3.6
通讯作者：
Kevin A. G. Smet
中科院分区：
文献类型：
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作者：
Kevin A. G. Smet
本文提出了两个新的中性轨迹来表征在普朗克光源和非普朗克光源的照明颜色的白度感知。这两个中性轨迹是基于(1)在真实三维立方体上获得的唯一白色评级(UW轨迹，基于对象模式)和(2)从中性和高色照明(CA轨迹，基于照明模式)下的颜色适应研究获得的适应程度得出的。给出了描述CIE u‘v’色度图中的轨迹的方程，以及与普朗克轨迹的距离(DUV)与相关色温(CCT)的关系以及“中性度”与CCT的关系。虽然这两个中性轨迹在形状上非常相似，但它们并不完全相同，UW-轨迹大约是CA-轨迹的(蓝色)移位版本。后者与文献中报道的其他基于光照的中性白色基因座有很好的一致性，这些基因座在CCT较低时均为负DUV，而在CCT较高时均为正DUV。就像文献中其他几条白色和消色点的线条一样，UW中性轨迹完全位于普朗克轨迹的下方。与最大中性程度相关的色度对于这两个位点来说都非常接近CIE D65日光光源的色度，这暗示了早期的报告，即视觉过程，如颜色恒定和颜色适应，因此感知到的光照中性，可能受到自然场景统计的影响。
ABSTRACT In this article, two new neutral loci are presented characterizing the whiteness perception of illumination color of on- and off-Planckian light sources. The two neutral loci are derived based on (1) unique white ratings obtained on a real three-dimensional cube (UW-locus, object mode based) and (2) the degrees of adaptation obtained from a study of chromatic adaptation under neutral and highly colored illuminations (CA-locus, illumination mode based). Equations are presented describing the loci in the CIE u′v′ chromaticity diagram and in terms of distance from the Planckian locus (Duv) versus correlated color temperature (CCT) and of “degree of neutrality” versus CCT. Although the two neutral loci are very similar in shape, they are not identical, with the UW-locus being approximately a (blue) shifted version of the CA-locus. The latter was in very good agreement with other illumination based neutral white loci reported in the literature, which all have in common negative Duv for lower CCTs and positive Duv for higher CCTs. Like several other lines of white and achromatic points from literature, the UW-neutral locus was located completely below the Planckian locus. The chromaticity associated with the maximum degree of neutrality was for both loci very close to that of the CIE D65 daylight illuminant, suggestive of earlier reports that vision processes such as color constancy and chromatic adaptation, and hence perceived illumination neutrality, are likely conditioned by natural scene statistics.