Gamma correction, gamma nonlinearity, gamma encoding, or often simply gamma, is the name of a nonlinear operation used to code and decode luminance or tristimulus values in video or still image systems. Gamma correction is, in the simplest cases, defined by the following power-law expression:
where A is a constant and the input and output values are non-negative real values; in the common case of A = 1, inputs and outputs are typically in the range 0–1. A gamma value γ < 1 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 γ > 1 is called a decoding gamma and the application of the expansive power-law nonlinearity is called gamma expansion.
Read more about Gamma Correction: Explanation, Generalized Gamma, In Photography, Windows, Mac, SRGB and TV/video Standard Gammas, Power Law For Video Display, Methods To Perform Display Gamma Correction in Computing, Simple Monitor Tests, Terminology
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