1. A computer system which comprises: a CPU; and a memory storing an image file containing an image; the CPU arranged and configured to execute a routine to determine multi-band intrinsic component information as a function of spatio-spectral information for intrinsic material and illumination for surfaces depicted in the image, expressed in a spatial extent of spectral characteristics, and calculate analytical information, as a function of the multi-band intrinsic component information, wherein the analytical information includes an illumination intensity histogram, a shadow depth and relative fill light color information.