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Gamma correction - Wikipedia

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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 𝑉 in is raised to the power 𝛾 and multiplied by the constant A to get the output value 𝑉 out . In the common case of A = 1, inputs and outputs are typically in the range 0–1. A gamma value 𝛾 1 is called a decoding gamma, and the application of the expansive power-law nonlinearity is called gamma expansion. Gamma encoding of images is used to optimize the usage of bits when encoding an image, or bandwidth used to transport an image, by taking advantage of the non-linear manner in which humans perceive light and color.[1] The human

Gamma correction - Wikipedia Jump to content From Wikipedia, the free encyclopedia Image luminance mapping function The effect of gamma correction on an image: the original image was taken to varying powers, showing that powers larger than 1 make the shadows darker, while powers smaller than 1 make dark regions lighter. This is not the actual gamma the picture has, though. Gamma correction or gamma is a nonlinear operation used to encode and decode luminance in video or images . [ 1 ] Gamma correction is, in the simplest cases, defined by the following power-law expression: V out = A V in γ ,

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