Speaker: László Neumann (Universitat de Girona, Spain)
In closed environment, especially in bright colored interiors, there occurs a significant change of saturation and some shifting of hue of original selected colors. This is due to multiple light interreflections. The human vision mechanism partly reduces this effect thanks to the change of the reference white. We can use multispectral radiosity or other multispectral global illumination models to compute the physical effects. A color appearance model, the new and powerful CIECAM02 model, will be used to compute the perceptual aspects.
The CIECAM02 includes the luminance and chromatic adaptation effects, and it has compact forward and inverse transformation formulas. The input data for the color appearance model is ensured by computing the multispectral radiosity solution. Thereby both the spectral radiance for every viewpoint and view direction and the spectral irradiance on every path of the scene are known. Nearly all earlier global illumination approaches ignored the often strong changes of originally selected colors. Using the presented method the selection or mixture of paints is possible with the same, after physical and perceptual effects, color appearance previously selected under standard viewing condition in a color atlas.
Finally some questions of perceptual metamerism to ensure highly constant color appearance under different viewing conditions and some aesthetical rules of color design will be discussed.