The Gamma correction node modifies the colors of a color map.
To add a Gamma correction node, right-click in the Graph Editor and select Create Node > Color > Gamma correction or use the keyboard shortcut N-C-G-C: Node Color Gamma Correction.
Select the node to open its parameters:
In both cases, the areas of low light and the areas of high light are little changed.
For example, initial image:
Result with Gamma = 2:
Result with Gamma = 0.5:
The result is different from that produced by the Brightness & Contrast node, which modifies all the points of the color map in the same way.
|Gamma||Darkens or brightens the points of average brightness.|
|Channels||Sets the red, green and/or blue channels to modify.|
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