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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 |