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Definition of "brightness" |
Brightness is the quotient of the luminous intensity of a small element of the source and the area of the element projected on to a plane perpendicular to the given direction. [Unit: candela per unit area or Cd/m2] / the perceived luminance or apparent intensity of light. This is often different from the actual (physical) luminance, as demonstrated by brightness constancy, Mach band, and simultaneous contrast. |
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