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Gamma

Applies a constant gamma value to a set of channels. This lightens or darkens the midtones.

The actual function is 1/pow(value).

NOTE:  Increasing the gamma to lighten the midtones darkens any values above 1. Similarly, decreasing the gamma to darken the midtones lightens any values below 0. If you don’t want this to happen, you can instead use a Colorspace node, which allows you to adjust the gamma using a color curve rather than a slider. Simply add points on the curve just below 0 and above 1 to preserve the super blacks and whites.