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  68. ><H1
  69. ><A
  70. NAME="SDLSETGAMMARAMP"
  71. >SDL_SetGammaRamp</A
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  78. ><H2
  79. >Name</H2
  80. >SDL_SetGammaRamp&nbsp;--&nbsp;Sets the color gamma lookup tables for the display</DIV
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  86. ><H2
  87. >Synopsis</H2
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  95. ><PRE
  96. CLASS="FUNCSYNOPSISINFO"
  97. >#include "SDL.h"</PRE
  98. ><P
  99. ><CODE
  100. ><CODE
  101. CLASS="FUNCDEF"
  102. >int <B
  103. CLASS="FSFUNC"
  104. >SDL_SetGammaRamp</B
  105. ></CODE
  106. >(Uint16 *redtable, Uint16 *greentable, Uint16 *bluetable);</CODE
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  118. >Description</H2
  119. ><P
  120. >Sets the gamma lookup tables for the display for each color component.
  121. Each table is an array of 256 Uint16 values, representing a mapping
  122. between the input and output for that channel. The input is the index
  123. into the array, and the output is the 16-bit gamma value at that index,
  124. scaled to the output color precision. You may pass NULL to any of the
  125. channels to leave them unchanged.</P
  126. ><P
  127. >This function adjusts the gamma based on lookup tables, you can also
  128. have the gamma calculated based on a "gamma function" parameter with
  129. <A
  130. HREF="sdlsetgamma.html"
  131. >SDL_SetGamma</A
  132. >.</P
  133. ><P
  134. >Not all display hardware is able to change gamma.</P
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  142. >Return Value</H2
  143. ><P
  144. >Returns -1 on error (or if gamma adjustment is not supported).</P
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  151. ><H2
  152. >See Also</H2
  153. ><P
  154. ><A
  155. HREF="sdlsetgamma.html"
  156. >SDL_SetGamma</A
  157. >
  158. <A
  159. HREF="sdlgetgammaramp.html"
  160. >SDL_GetGammaRamp</A
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