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     4 >SDL_SetGammaRamp</TITLE
       
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    71 ><H1
       
    72 ><A
       
    73 NAME="SDLSETGAMMARAMP"
       
    74 ></A
       
    75 >SDL_SetGammaRamp</H1
       
    76 ><DIV
       
    77 CLASS="REFNAMEDIV"
       
    78 ><A
       
    79 NAME="AEN1624"
       
    80 ></A
       
    81 ><H2
       
    82 >Name</H2
       
    83 >SDL_SetGammaRamp&nbsp;--&nbsp;Sets the color gamma lookup tables for the display</DIV
       
    84 ><DIV
       
    85 CLASS="REFSYNOPSISDIV"
       
    86 ><A
       
    87 NAME="AEN1627"
       
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    90 >Synopsis</H2
       
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    92 CLASS="FUNCSYNOPSIS"
       
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    94 NAME="AEN1628"
       
    95 ></A
       
    96 ><P
       
    97 ></P
       
    98 ><PRE
       
    99 CLASS="FUNCSYNOPSISINFO"
       
   100 >#include "SDL.h"</PRE
       
   101 ><P
       
   102 ><CODE
       
   103 ><CODE
       
   104 CLASS="FUNCDEF"
       
   105 >int <B
       
   106 CLASS="FSFUNC"
       
   107 >SDL_SetGammaRamp</B
       
   108 ></CODE
       
   109 >(Uint16 *redtable, Uint16 *greentable, Uint16 *bluetable);</CODE
       
   110 ></P
       
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   120 ><H2
       
   121 >Description</H2
       
   122 ><P
       
   123 >Sets the gamma lookup tables for the display for each color component.
       
   124 Each table is an array of 256 Uint16 values, representing a mapping
       
   125 between the input and output for that channel. The input is the index
       
   126 into the array, and the output is the 16-bit gamma value at that index,
       
   127 scaled to the output color precision. You may pass NULL to any of the
       
   128 channels to leave them unchanged.</P
       
   129 ><P
       
   130 >This function adjusts the gamma based on lookup tables, you can also
       
   131 have the gamma calculated based on a "gamma function" parameter with
       
   132 <A
       
   133 HREF="sdlsetgamma.html"
       
   134 >SDL_SetGamma</A
       
   135 >.</P
       
   136 ><P
       
   137 >Not all display hardware is able to change gamma.</P
       
   138 ></DIV
       
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   140 CLASS="REFSECT1"
       
   141 ><A
       
   142 NAME="AEN1640"
       
   143 ></A
       
   144 ><H2
       
   145 >Return Value</H2
       
   146 ><P
       
   147 >Returns -1 on error (or if gamma adjustment is not supported).</P
       
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   150 CLASS="REFSECT1"
       
   151 ><A
       
   152 NAME="AEN1643"
       
   153 ></A
       
   154 ><H2
       
   155 >See Also</H2
       
   156 ><P
       
   157 ><A
       
   158 HREF="sdlsetgamma.html"
       
   159 >SDL_SetGamma</A
       
   160 >
       
   161 <A
       
   162 HREF="sdlgetgammaramp.html"
       
   163 >SDL_GetGammaRamp</A
       
   164 ></P
       
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