.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".PPSets 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\&..PPThis 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\&..PPNot all display hardware is able to change gamma\&..SH "RETURN VALUE".PPReturns -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