Gamma correction

Gamma correction, gamma nonlinearity, gamma encoding, or generally artlessly gamma, is the name of a nonlinear operation acclimated to cipher and break luminance or tristimulus ethics in video or still angel systems.1 Gamma alteration is, in the simplest cases, authentic by the afterward power-law expression:

where A is a connected and the ascribe and achievement ethics are non-negative absolute values; in the accepted case of A = 1, inputs and outputs are about in the ambit 0–1. A gamma amount γ < 1 is sometimes alleged an encoding gamma, and the action of encoding with this compressive power-law nonlinearity is alleged gamma compression; against a gamma amount γ > 1 is alleged a adaptation gamma and the appliance of the all-embracing power-law nonlinearity is alleged gamma expansion.