Generalized Gamma
The concept of gamma can be applied to any nonlinear relationship. For the power-law relationship Vout = Vinγ, the curve on a log–log plot is a straight line, with slope everywhere equal to gamma (slope is represented here by the derivative operator):
That is, gamma can be visualised as the slope of the input–output curve when plotted on logarithmic axes. For a power-law curve, this slope is constant, but the idea can be extended to any type of curve, in which case gamma (strictly speaking, "point gamma") is defined as the slope of the curve in any particular region.
Read more about this topic: Gamma Correction
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