RGB Gamma Channel Control

Hi I have been wondering if there’s an option to control separately RGB channels and do some basic color grading? The default client has an option to change Saturation/brightness and contrast.
I was trying to find some resource but without any success so I thought it’s best to ask.

much appreciated!
Thank you

You can try the MIXER LEVELS command. Maybe you need to play around with it, until you get something useful.