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1. In display systems, the relation between (a) the intensity of color, brightness, or shading of an area occupied by a display element, display group, or display image on the display surface of a display device and (b) the intensity of an area not occupied by a display elements, a display group, or a display image. Deprecated synonym brightness ratio. 2. In optical character recognition, the difference between color or shading of the printed material on a document and the background on which it is printed.