docs/man3/SDL_SetGamma.3
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     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