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Barco's Contrast Modulation circuitry is designed to improve overall light output uniformity and to overcome the inherent color shift errors normally associated with CRT projection.
The laws of physics applied to projection optics dictate that the centre of the projected image will be brighter than the corners, a phenomenon normally referred to as 'corner fall off'.
Due to the normal off-axis projection of the red and blue images, CRT projection displays a phenomenon normally referred to as 'color shift', whereby one side of the image is redish and the other blueish. By modulating the amplitude of the videosignal with appropriate waveforms it is possible to overcome both problems.
