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<HTML><HEAD><TITLE>SDL_SetGammaRamp</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+"><LINKREL="HOME"TITLE="SDL Library Documentation"HREF="index.html"><LINKREL="UP"TITLE="Video"HREF="video.html"><LINKREL="PREVIOUS"TITLE="SDL_GetGammaRamp"HREF="sdlgetgammaramp.html"><LINKREL="NEXT"TITLE="SDL_MapRGB"HREF="sdlmaprgb.html"></HEAD><BODYCLASS="REFENTRY"BGCOLOR="#FFF8DC"TEXT="#000000"LINK="#0000ee"VLINK="#551a8b"ALINK="#ff0000"><DIVCLASS="NAVHEADER"><TABLESUMMARY="Header navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">SDL Library Documentation</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="sdlgetgammaramp.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom"></TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="sdlmaprgb.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><H1><ANAME="SDLSETGAMMARAMP"></A>SDL_SetGammaRamp</H1><DIVCLASS="REFNAMEDIV"><ANAME="AEN1624"></A><H2>Name</H2>SDL_SetGammaRamp -- Sets the color gamma lookup tables for the display</DIV><DIVCLASS="REFSYNOPSISDIV"><ANAME="AEN1627"></A><H2>Synopsis</H2><DIVCLASS="FUNCSYNOPSIS"><ANAME="AEN1628"></A><P></P><PRECLASS="FUNCSYNOPSISINFO">#include "SDL.h"</PRE><P><CODE><CODECLASS="FUNCDEF">int <BCLASS="FSFUNC">SDL_SetGammaRamp</B></CODE>(Uint16 *redtable, Uint16 *greentable, Uint16 *bluetable);</CODE></P><P></P></DIV></DIV><DIVCLASS="REFSECT1"><ANAME="AEN1634"></A><H2>Description</H2><P>Sets the gamma lookup tables for the display for each color component.Each table is an array of 256 Uint16 values, representing a mappingbetween the input and output for that channel. The input is the indexinto the array, and the output is the 16-bit gamma value at that index,scaled to the output color precision. You may pass NULL to any of thechannels to leave them unchanged.</P><P>This function adjusts the gamma based on lookup tables, you can alsohave the gamma calculated based on a "gamma function" parameter with<AHREF="sdlsetgamma.html">SDL_SetGamma</A>.</P><P>Not all display hardware is able to change gamma.</P></DIV><DIVCLASS="REFSECT1"><ANAME="AEN1640"></A><H2>Return Value</H2><P>Returns -1 on error (or if gamma adjustment is not supported).</P></DIV><DIVCLASS="REFSECT1"><ANAME="AEN1643"></A><H2>See Also</H2><P><AHREF="sdlsetgamma.html">SDL_SetGamma</A><AHREF="sdlgetgammaramp.html">SDL_GetGammaRamp</A></P></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLESUMMARY="Footer navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="sdlgetgammaramp.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="index.html"ACCESSKEY="H">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="sdlmaprgb.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">SDL_GetGammaRamp</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="video.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">SDL_MapRGB</TD></TR></TABLE></DIV></BODY></HTML>⌨️ 快捷键说明
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