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><H1
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>SDL_SetGammaRamp</H1
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>Name</H2
>SDL_SetGammaRamp&nbsp;--&nbsp;Sets the color gamma lookup tables for the display</DIV
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>#include "SDL.h"</PRE
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><CODE
><CODE
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>int <B
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>SDL_SetGammaRamp</B
></CODE
>(Uint16 *redtable, Uint16 *greentable, Uint16 *bluetable);</CODE
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>Description</H2
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>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.</P
><P
>This function adjusts the gamma based on lookup tables, you can also
have the gamma calculated based on a "gamma function" parameter with
<A
HREF="sdlsetgamma.html"
>SDL_SetGamma</A
>.</P
><P
>Not all display hardware is able to change gamma.</P
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>Return Value</H2
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>Returns -1 on error (or if gamma adjustment is not supported).</P
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>See Also</H2
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><A
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>SDL_SetGamma</A
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<A
HREF="sdlgetgammaramp.html"
>SDL_GetGammaRamp</A
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author	Ryan C. Gordon <icculus@icculus.org>
date	Mon, 22 Aug 2005 14:18:15 +0000
parents	355632dca928
children