<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >imagecolorat</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="Manual do PHP" HREF="index.html"><LINK REL="UP" TITLE="Imagens, Funções de" HREF="ref.image.html"><LINK REL="PREVIOUS" TITLE="imagecolorallocatealpha" HREF="function.imagecolorallocatealpha.html"><LINK REL="NEXT" TITLE="imagecolorclosest" HREF="function.imagecolorclosest.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" >Manual do PHP</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.imagecolorallocatealpha.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.imagecolorclosest.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.imagecolorat" ></A >imagecolorat</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN82979" ></A ><P > (PHP 3, PHP 4, PHP 5)</P >imagecolorat -- Retorna o índice da cor de um pixel</DIV ><DIV CLASS="refsect1" ><A NAME="AEN82982" ></A ><H2 >Descrição</H2 >int <B CLASS="methodname" >imagecolorat</B > ( resource image, int x, int y )<BR ></BR ><P > Retorna o índice da cor de um pixel no local especificado da imagem <CODE CLASS="parameter" >image</CODE >. </P ><P > Se o PHP foi compilado com a biblioteca GD 2.0 ou superior e a imagem for truecolor, esta função retorna o valor RGB deste pixel como um inteiro. Use bitshifting e masking para acessar os valores distintos dos componentes vermelho, verde e azul: <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN82999" ></A ><P ><B >Exemplo 1. Acessando os valores RGB distintos</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br />$im </font><font color="#007700">= </font><font color="#0000BB">ImageCreateFromPng</font><font color="#007700">(</font><font color="#DD0000">"rockym.png"</font><font color="#007700">);<br /></font><font color="#0000BB">$rgb </font><font color="#007700">= </font><font color="#0000BB">ImageColorAt</font><font color="#007700">(</font><font color="#0000BB">$im</font><font color="#007700">, </font><font color="#0000BB">100</font><font color="#007700">, </font><font color="#0000BB">100</font><font color="#007700">);<br /></font><font color="#0000BB">$r </font><font color="#007700">= (</font><font color="#0000BB">$rgb </font><font color="#007700">>> </font><font color="#0000BB">16</font><font color="#007700">) & </font><font color="#0000BB">0xFF</font><font color="#007700">;<br /></font><font color="#0000BB">$g </font><font color="#007700">= (</font><font color="#0000BB">$rgb </font><font color="#007700">>> </font><font color="#0000BB">8</font><font color="#007700">) & </font><font color="#0000BB">0xFF</font><font color="#007700">;<br /></font><font color="#0000BB">$b </font><font color="#007700">= </font><font color="#0000BB">$rgb </font><font color="#007700">& </font><font color="#0000BB">0xFF</font><font color="#007700">;<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ><P > Veja também <A HREF="function.imagecolorset.html" ><B CLASS="function" >imagecolorset()</B ></A > e <A HREF="function.imagecolorsforindex.html" ><B CLASS="function" >imagecolorsforindex()</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.imagecolorallocatealpha.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Principal</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.imagecolorclosest.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >imagecolorallocatealpha</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.image.html" ACCESSKEY="U" >Acima</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >imagecolorclosest</TD ></TR ></TABLE ></DIV ></BODY ></HTML >