[sdl_omap.git] / docs / man3 / SDL_SetGammaRamp.3

.TH "SDL_SetGammaRamp" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" 
.SH "NAME"
SDL_SetGammaRamp \- Sets the color gamma lookup tables for the display
.SH "SYNOPSIS"
.PP
\fB#include "SDL\&.h"
.sp
\fBint \fBSDL_SetGammaRamp\fP\fR(\fBUint16 *redtable, Uint16 *greentable, Uint16 *bluetable\fR);
.SH "DESCRIPTION"
.PP
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\&.
.PP
This function adjusts the gamma based on lookup tables, you can also have the gamma calculated based on a "gamma function" parameter with \fISDL_SetGamma\fR\&.
.PP
Not all display hardware is able to change gamma\&.
.SH "RETURN VALUE"
.PP
Returns -1 on error (or if gamma adjustment is not supported)\&.
.SH "SEE ALSO"
.PP
\fISDL_SetGamma\fR \fISDL_GetGammaRamp\fR
.\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01
Commit	Line	Data
e14743d1	1	.TH "SDL_SetGammaRamp" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference"
	2	.SH "NAME"
	3	SDL_SetGammaRamp \- Sets the color gamma lookup tables for the display
	4	.SH "SYNOPSIS"
	5	.PP
	6	\fB#include "SDL\&.h"
	7	.sp
	8	\fBint \fBSDL_SetGammaRamp\fP\fR(\fBUint16 redtable, Uint16 greentable, Uint16 *bluetable\fR);
	9	.SH "DESCRIPTION"
	10	.PP
	11	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\&.
	12	.PP
	13	This function adjusts the gamma based on lookup tables, you can also have the gamma calculated based on a "gamma function" parameter with \fISDL_SetGamma\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_SetGamma\fR \fISDL_GetGammaRamp\fR
	22	.\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01