This command will set the screens red, green and blue gamma levels. You can change the gamma to fade in and out the contents of the screen or alter the ratio of colours displayed. The red, green and blue component values can range from 0 to 511, with 255 being the default values. Reducing these values fades each colour component out of the screen, and above the default value enhances the ratio of the component colour. Some graphics cards do not support gamma alteration.

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