.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