SDL_SetGamma - Sets the color gamma function for the display

       Sets the "gamma function" for the display of each color component. Gamma controls the brightness/contrast
       of colors displayed on the screen. A gamma value of 1.0 is identity (i.e., no adjustment is made).

       This  function adjusts the gamma based on the "gamma function" parameter, you can directly specify lookup
       tables for gamma adjustment with SDL_SetGammaRamp.

       Not all display hardware is able to change gamma.

       SDL_SetGamma - Sets the color gamma function for the display

       Returns -1 on error (or if gamma adjustment is not supported).

SDL_GetGammaRampSDL_SetGammaRamp

SDL                                          Tue 11 Sep 2001, 23:01                              SDL_SetGamma(3)

#include"SDL.h"intSDL_SetGamma(floatredgamma,floatgreengamma,floatbluegamma);