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sdlsetgamma.html
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sdlsetgamma.html
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<HTML
><HEAD
><TITLE
>SDL_SetGamma</TITLE
><META
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CONTENT="Modular DocBook HTML Stylesheet Version 1.64
"><LINK
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TITLE="SDL Library Documentation"
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><BODY
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VLINK="#551a8b"
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><HR
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><H1
><A
NAME="SDLSETGAMMA"
>SDL_SetGamma</A
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN1154"
></A
><H2
>Name</H2
>SDL_SetGamma -- Sets the color gamma function for the display</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN1157"
></A
><H2
>Synopsis</H2
><DIV
CLASS="FUNCSYNOPSIS"
><A
NAME="AEN1158"
></A
><P
></P
><PRE
CLASS="FUNCSYNOPSISINFO"
>#include "SDL.h"</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>int <B
CLASS="FSFUNC"
>SDL_SetGamma</B
></CODE
>(float redgamma, float greengamma, float bluegamma);</CODE
></P
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN1164"
></A
><H2
>Description</H2
><P
>Sets the "gamma function" for the display of each color component. Gamma
controls the brightness/contrast of colors displayed on the screen.
A gamma value of <TT
CLASS="CONSTANT"
>1.0</TT
> is identity (i.e., no adjustment
is made).</P
><P
>This function adjusts the gamma based on the "gamma function" parameter,
you can directly specify lookup tables for gamma adjustment with
<A
HREF="sdlsetgammaramp.html"
>SDL_SetGammaRamp</A
>.</P
><P
>Not all display hardware is able to change gamma.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN1171"
></A
><H2
>Return Value</H2
><P
>Returns -1 on error (or if gamma adjustment is not supported).</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN1174"
></A
><H2
>See Also</H2
><P
><A
HREF="sdlgetgammaramp.html"
>SDL_GetGammaRamp</A
>
<A
HREF="sdlsetgammaramp.html"
>SDL_SetGammaRamp</A
></P
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>Next</A
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>SDL_SetPalette</TD
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HREF="video.html"
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>SDL_GetGammaRamp</TD
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>