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     72 ><A
     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
     85 CLASS="REFSYNOPSISDIV"
     86 ><A
     87 NAME="AEN1627"
     88 ></A
     89 ><H2
     90 >Synopsis</H2
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     94 NAME="AEN1628"
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     96 ><P
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     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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    116 CLASS="REFSECT1"
    117 ><A
    118 NAME="AEN1634"
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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
    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"
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    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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