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