1 .TH "SDL_SetGamma" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" 

     2 .SH "NAME"

     3 SDL_SetGamma \- Sets the color gamma function for the display

     4 .SH "SYNOPSIS"

     5 .PP

     6 \fB#include "SDL\&.h"

     7 .sp

     8 \fBint \fBSDL_SetGamma\fP\fR(\fBfloat redgamma, float greengamma, float bluegamma\fR);

     9 .SH "DESCRIPTION"

    10 .PP

    11 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)\&.

    12 .PP

    13 This function adjusts the gamma based on the "gamma function" parameter, you can directly specify lookup tables for gamma adjustment with \fISDL_SetGammaRamp\fR\&.

    14 .PP

    15 Not all display hardware is able to change gamma\&.

    16 .SH "RETURN VALUE"

    17 .PP

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

    19 .SH "SEE ALSO"

    20 .PP

    21 \fISDL_GetGammaRamp\fR \fISDL_SetGammaRamp\fR

    22 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01