Abstract: An integrator for spectral analysis of printing illumination from photographic film including a lens for collimating the printing illumination into a beam. The integrator includes first and second color separation filters which divert respective colors from the beam. First and second phototransducers are provided for receiving the respective colors. A third phototransducer receives the beam passing through the first and second filters. Each phototransducer produces a signal representative of the intensity of the respective color.

Abstract: A light source including a plurality of different individual lamps providing primary colors. A mirror which selectively reflects is associated with each lamp. The mirror reflects the corresponding primary color through a filter into a color mixing chamber which provides light having predetermined color composition. A photocell sensing system senses the light in the mixing chamber to provide electrical signals corresponding to the intensity of each color. The signals are employed in a color composition control system for controlling the intensity of the individual light lamps.