<HTML ><HEAD ><TITLE >imagegammacorrect</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="PHP Manual" HREF="index.html"><LINK REL="UP" TITLE="Image functions" HREF="ref.image.html"><LINK REL="PREVIOUS" TITLE="imagefttext" HREF="function.imagefttext.html"><LINK REL="NEXT" TITLE="imagegd2" HREF="function.imagegd2.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=ISO-8859-1"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >PHP Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.imagefttext.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.imagegd2.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.imagegammacorrect" ></A >imagegammacorrect</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN35814" ></A ><P > (PHP 3>= 3.0.13, PHP 4 )</P >imagegammacorrect -- Apply a gamma correction to a GD image</DIV ><DIV CLASS="refsect1" ><A NAME="AEN35817" ></A ><H2 >Description</H2 >int <B CLASS="methodname" >imagegammacorrect</B > ( resource image, float inputgamma, float outputgamma)<BR ></BR ><P > The <B CLASS="function" >imagegammacorrect()</B > function applies gamma correction to a gd image stream (<TT CLASS="parameter" ><I >image</I ></TT >) given an input gamma, the parameter <TT CLASS="parameter" ><I >inputgamma</I ></TT > and an output gamma, the parameter <TT CLASS="parameter" ><I >outputgamma</I ></TT >. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="function.imagefttext.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.imagegd2.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >imagefttext</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.image.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >imagegd2</TD ></TR ></TABLE ></DIV ></BODY ></HTML >