1. Strictly speaking, luminance is defined only for the CIE standard photopic observer, and also requires knowledge of the absolute spectral radiance. However, our algorithm constructs a photometrically scaled measure of the digitizing system's response to spectral radiance and reflectance. This means that we can calculate luminous reflectances in a digitized image, although radiance measurements would be needed to determine absolute luminances.
2. Color constancy: a method for recovering surface spectral reflectance
3. The transformation of color-mixture equations from one system to another
4. Computational approaches to color constancy, Stanford Applied Psychology Laboratory Technical Report 1985–01, Stanford University, Stanford, California, 1985.