Gamma correction
Image luminance mapping function / From Wikipedia, the free encyclopedia
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Gamma correction or gamma is a nonlinear operation used to encode and decode luminance or tristimulus values in video or still image systems.[1] Gamma correction is, in the simplest cases, defined by the following power-law expression:
where the non-negative real input value is raised to the power and multiplied by the constant A to get the output value . In the common case of A = 1, inputs and outputs are typically in the range 0–1.
A gamma value is sometimes called an encoding gamma, and the process of encoding with this compressive power-law nonlinearity is called gamma compression; conversely, a gamma value is called a decoding gamma, and the application of the expansive power-law nonlinearity is called gamma expansion.