<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >imagecolorclosestalpha</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="PHP 手册" HREF="index.html"><LINK REL="UP" TITLE="Image 图像函数" HREF="ref.image.html"><LINK REL="PREVIOUS" TITLE="imagecolorclosest" HREF="function.imagecolorclosest.html"><LINK REL="NEXT" TITLE="imagecolorclosesthwb" HREF="function.imagecolorclosesthwb.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></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 手册</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.imagecolorclosest.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.imagecolorclosesthwb.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.imagecolorclosestalpha" ></A >imagecolorclosestalpha</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN87223" ></A ><P > (PHP 4 >= 4.0.6, PHP 5)</P >imagecolorclosestalpha -- 取得与指定的颜色加透明度最接近的颜色</DIV ><DIV CLASS="refsect1" ><A NAME="AEN87226" ></A ><H2 >说明</H2 >int <B CLASS="methodname" >imagecolorclosestalpha</B > ( resource image, int red, int green, int blue, int alpha )<BR ></BR ><P > 返回图像调色板中与指定的 <ACRONYM CLASS="acronym" >RGB</ACRONYM > 值以及 <CODE CLASS="parameter" >alpha</CODE > 深度最“接近”的颜色。 </P ><DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><B >注意: </B >本函数需要 GD 2.0.1 或更高版本(推荐 2.0.28 及更高版本)。</P ></BLOCKQUOTE ></DIV ><P > 参见 <A HREF="function.imagecolorexactalpha.html" ><B CLASS="function" >imagecolorexactalpha()</B ></A >。 </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.imagecolorclosest.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >起始页</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.imagecolorclosesthwb.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >imagecolorclosest</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.image.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >imagecolorclosesthwb</TD ></TR ></TABLE ></DIV ></BODY ></HTML >