This node has the gamma, tone mapping and other settings to process the rendered image.
There is option inside this node that allow pick the current white point inside the IPRProvides artists a quick preview of the image prior to the final render, and efficiently allows for adjusting some elements in the scene such as lights, shaders and textures interactively. An IPR image contains shading and lighting data including some for visibility, in addition to the software render. window while it is rendering.
This node also has a set of parameters to set a custom 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 Response for the IPR window, if user doesn’t want to use the same parameters for the IPR and for the final rendering.