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 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

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