| Definition: | 1. in the perceptual sense : Assessment of the difference in appearance of two or more parts of a field seen simultaneously or successively (hence : brightness contrast, lightness contrast, colour contrast, simultaneous contrast, successive contrast, etc.)
2. in the physical sense : Quantity intended to correlate with the perceived brightness contrast, usually defined by one of a number of formulae which involve the luminances of the stimuli considered, for example : ΔL / L near the luminance threshold, or L1/L2 for much higher luminances
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