The Gamma node allows you to apply gamma correction to an element in your scene or to your entire scene. The gamma correction can be applied to all colour channels, to a specific colour channel or even to the image’s alpha channel.
Gamma correction is a curvilinear function applied to the colour values. It is used to modulate the difference in intensity between colour values. In other words, it affects how much differences between low, medium and high colour values translate to actual variations of intensity between colours. For example:
A gamma correction between 0 and 1 will make low values lower progressively lower, causing a bigger spectrum of dark colours to appear closer to black. The contrast between high values is increased to compensate.
- A gamma correction above 1 will increase the value of dark colours proportionally to their actual values, increasing the contrast between them and making them lighter. The contrast between high values is decreased to compensate.
To use the Gamma node, simply connect it under the element, effect or composite to which you want to apply the gamma correction. The node will take the input image from its top port, apply the gamma correction to it and output the corrected image out of its bottom port.
If you only need to apply gamma correction to the rendered frames without affecting the preview image in the Camera view, simply connect it between your scene’s main Composite node and its Write node. Likewise, if you only need to apply a gamma correction to the preview image in the Camera view, but you don’t want it to be applied to the rendered frames, simply connect it between your scene’s main Composite node and its Display node.
|Name||The name of the node as it appears in the Node View and the Timeline view. Each node must have a name that is unique to its containing group.|
|RGB Gamma||The gamma correction value or function to apply to red, green and blue channels simultaneously.|
|Red Gamma||The gamma correction value or function to apply to red colour values only.|
|Green Gamma||The gamma correction value or function to apply to green colour values only.|
|Blue Gamma||The gamma correction value or function to apply to blue colour values only.|
|Alpha Gamma||The gamma correction value or function to apply to alpha values only.|