Experiments using real images are conducted on a variety of color constancy algorithms (Chromagenic, Greyworld,
Max RGB, and a Maloney-Wandell extension called Subspace Testing) in order to determine whether or not extending
the number of channels from 3 to 6 to 9 would enhance the accuracy with which they estimate the scene illuminant
color. To create the 6 and 9 channel images, filters where placed over a standard 3-channel color camera. Although
some improvement is found with 6 channels, the results indicate that essentially the extra channels do not help as much
as might be expected.