Bäuml K H
Institut für Psychologie, Universität Regensburg, Germany.
J Opt Soc Am A Opt Image Sci Vis. 1994 Feb;11(2):531-42. doi: 10.1364/josaa.11.000531.
A theory about how changes in the illuminant affect the color appearance of objects must specify how the visual system's adjustments to illuminant changes vary with the surface collection in a scene. I report an experiment designed to investigate this issue. The stimuli were CRT simulations of flat matte surfaces rendered under diffuse illumination. For all combinations of 7 daylight illuminants and 12 collections of surface reflectances the subject's achromatic locus was measured on an isoluminant plane in color space. For any surface collection the changes in the achromatic locus could be well approximated by a linear transformation of the illuminant changes. These linear transformations showed relatively small variation with the surface collection. To first approximation, these results suggest that the effect of changes in the illuminant on color appearance can be described linearly and that it can be separated from the surface collection. There was an effect of the surface collection on the achromatic locus. The data rejected the idea that a surface collection's mean reflectance function might capture this effect, ruling out models of color appearance that are based on this kind of averaging assumption.
一个关于光源变化如何影响物体颜色外观的理论必须说明视觉系统对光源变化的调整如何随场景中的表面集合而变化。我报告了一项旨在研究这个问题的实验。刺激物是在漫射光照射下呈现的平面哑光表面的阴极射线管模拟。对于7种日光光源和12种表面反射率集合的所有组合，在颜色空间的等亮度平面上测量了受试者的消色差轨迹。对于任何表面集合，消色差轨迹的变化都可以通过光源变化的线性变换很好地近似。这些线性变换随表面集合的变化相对较小。初步近似来看，这些结果表明光源变化对颜色外观的影响可以用线性方式描述，并且可以与表面集合分开。表面集合对消色差轨迹有影响。数据否定了表面集合的平均反射率函数可能捕捉到这种影响的观点，排除了基于这种平均假设的颜色外观模型。
