Color Correction

The Color Correction node adjusts image map attributes such as Brightness, Hue, Saturation, GammaThe function or attribute used to code or decode luminance for common displays. The computer graphics industry has set a standard gamma setting of 2.2 making it the most common default for 3D modelling and rendering applications., and Contrast.

In the image below the second and fourth materials are passing through a Color Correction Texture and with edited parameters.