NAME

       SDL_SetGammaRamp - Sets the color gamma lookup tables for the display

SYNOPSIS

       #include "SDL.h"

       int SDL_SetGammaRamp(Uint16 *redtable, Uint16 *greentable, Uint16 *bluetable);

DESCRIPTION

       Sets  the  gamma  lookup tables for the display for each color component. Each table is an
       array of 256 Uint16 values, representing a mapping between the input and output  for  that
       channel.  The  input is the index into the array, and the output is the 16-bit gamma value
       at that index, scaled to the output color precision. You may  pass  NULL  to  any  of  the
       channels to leave them unchanged.

       This  function  adjusts  the  gamma  based  on  lookup tables, you can also have the gamma
       calculated based on a "gamma function" parameter with SDL_SetGamma.

       Not all display hardware is able to change gamma.

RETURN VALUE

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

SEE ALSO

       SDL_SetGamma SDL_GetGammaRamp