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OpenSolaris 2009.06 - man page for sdl_setgammaramp (opensolaris section 3)

SDL_SetGammaRamp(3)			SDL API Reference		      SDL_SetGammaRamp(3)

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 chan-
       nels to leave them unchanged.

       This function adjusts the gamma based on lookup tables, you can also have the gamma calcu-
       lated 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

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


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