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The contrast ratio (CR) is a property of a display system, defined as the ratio of the luminance of the brightest shade (white) to that of the darkest shade (black) that the system is capable of producing. A high contrast ratio is a desired aspect of any display. It has similarities with dynamic range.

The contrast ratio is typically measured as
:or as the Weber contrast:
:or as the Michelson contrast:
:

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