The Color Correction node adjusts image map attributes such as Brightness, Hue, Saturation, GammaIn Computer Graphics, gamma refers to the function or attribute used to code or decode luminance for common displays., and Contrast (Figure 1).
Figure 1: The Color Correction node alters the RGB Color node's Hue and Brightness values before connecting to the DiffuseAmount of diffusion, or the reflection of light photons at different angles from an uneven or granular surface. Used for dull, non-reflecting materials or mesh emitters. pin on a Diffuse materialUsed for dull, non-reflecting materials or mesh emitters.