<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Get the index of the specified color + alpha</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.imagecolorexact.html">imagecolorexact</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.imagecolormatch.html">imagecolormatch</a></div> <div class="up"><a href="ref.image.html">GD and Image Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="function.imagecolorexactalpha" class="refentry"> <div class="refnamediv"> <h1 class="refname">imagecolorexactalpha</h1> <p class="verinfo">(PHP 4 >= 4.0.6, PHP 5)</p><p class="refpurpose"><span class="refname">imagecolorexactalpha</span> — <span class="dc-title">Get the index of the specified color + alpha</span></p> </div> <div class="refsect1 description" id="refsect1-function.imagecolorexactalpha-description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">int</span> <span class="methodname"><strong>imagecolorexactalpha</strong></span> ( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span> , <span class="methodparam"><span class="type">int</span> <code class="parameter">$red</code></span> , <span class="methodparam"><span class="type">int</span> <code class="parameter">$green</code></span> , <span class="methodparam"><span class="type">int</span> <code class="parameter">$blue</code></span> , <span class="methodparam"><span class="type">int</span> <code class="parameter">$alpha</code></span> )</div> <p class="para rdfs-comment"> Returns the index of the specified color+alpha in the palette of the image. </p> </div> <div class="refsect1 parameters" id="refsect1-function.imagecolorexactalpha-parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><em><code class="parameter"> image</code></em></span><dd> <p class="para">An image resource, returned by one of the image creation functions, such as <span class="function"><a href="function.imagecreatetruecolor.html" class="function">imagecreatetruecolor()</a></span>.</p></dd> </dt> <dt> <span class="term"><em><code class="parameter">red</code></em></span> <dd> <p class="para">Value of red component.</p> </dd> </dt> <dt> <span class="term"><em><code class="parameter">green</code></em></span> <dd> <p class="para">Value of green component.</p> </dd> </dt> <dt> <span class="term"><em><code class="parameter">blue</code></em></span> <dd> <p class="para">Value of blue component.</p> </dd> </dt> <dt> <span class="term"><em><code class="parameter">alpha</code></em></span> <dd> <p class="para"> A value between <em>0</em> and <em>127</em>. <em>0</em> indicates completely opaque while <em>127</em> indicates completely transparent. </p> </dd> </dt> </dl> The colors parameters are integers between 0 and 255 or hexadecimals between 0x00 and 0xFF. </p> </div> <div class="refsect1 returnvalues" id="refsect1-function.imagecolorexactalpha-returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the index of the specified color+alpha in the palette of the image, or -1 if the color does not exist in the image's palette. </p> </div> <div class="refsect1 examples" id="refsect1-function.imagecolorexactalpha-examples"> <h3 class="title">Examples</h3> <div class="example" id="example-3192"> <p><strong>Example #1 Get colors from the GD logo</strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br /><br /></span><span style="color: #FF8000">// Setup an image<br /></span><span style="color: #0000BB">$im </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatefrompng</span><span style="color: #007700">(</span><span style="color: #DD0000">'./gdlogo.png'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$colors </span><span style="color: #007700">= Array();<br /></span><span style="color: #0000BB">$colors</span><span style="color: #007700">[] = </span><span style="color: #0000BB">imagecolorexactalpha</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$colors</span><span style="color: #007700">[] = </span><span style="color: #0000BB">imagecolorexactalpha</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">127</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$colors</span><span style="color: #007700">[] = </span><span style="color: #0000BB">imagecolorexactalpha</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">55</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$colors</span><span style="color: #007700">[] = </span><span style="color: #0000BB">imagecolorexactalpha</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">52</span><span style="color: #007700">, </span><span style="color: #0000BB">20</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$colors</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Free from memory<br /></span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> <div class="example-contents"><p>The above example will output something similar to:</p></div> <div class="example-contents screen"> <div class="cdata"><pre> Array ( [0] => 16711680 [1] => 2130706432 [2] => 939524095 [3] => 342163252 ) </pre></div> </div> </div> </div> <div class="refsect1 notes" id="refsect1-function.imagecolorexactalpha-notes"> <h3 class="title">Notes</h3> <blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">This function requires GD 2.0.1 or later (2.0.28 or later is recommended).</span></p></blockquote> </div> <div class="refsect1 seealso" id="refsect1-function.imagecolorexactalpha-seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"> <span class="function"><a href="function.imagecolorclosestalpha.html" class="function" rel="rdfs-seeAlso">imagecolorclosestalpha()</a> - Get the index of the closest color to the specified color + alpha</span></li> </ul> </p> </div> </div><hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.imagecolorexact.html">imagecolorexact</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.imagecolormatch.html">imagecolormatch</a></div> <div class="up"><a href="ref.image.html">GD and Image Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div></body></html>