Chrominance is the color component of a video signal that includes information on tint (hue) and saturation (intensity). Color is a three dimensional quantity and can be represented in many ways. We will be using two different representations. In the perceptual representation, color is defined by its luminance (or radiance)  and chrominance. The one-dimensional luminance defines the brightness of a color while the two-dimensional chrominance defines the hue and saturation of a color.

Nearly all projectors will have at least one composite and one S-Video connection. S-video cables differ from composite cables in that they split video signal into two different components: luminance and chrominance which would normally be a composite signal riding "under" the luminance information at a frequency below the 3.58MHz ‘color burst’ frequency.  This work leads to the real- izationthat luminance variessignicantly within and across projectors while chrominance variation is relatively small, especially across projectors of same model.