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  73 NAME="SDLSETGAMMARAMP"
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  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
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  87 NAME="AEN1627"
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  90 >Synopsis</H2
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  98 ><PRE
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 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
 111 ><P
 112 ></P
 113 ></DIV
 114 ></DIV
 115 ><DIV
 116 CLASS="REFSECT1"
 117 ><A
 118 NAME="AEN1634"
 119 ></A
 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
 139 ><DIV
 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
 148 ></DIV
 149 ><DIV
 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
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