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<title>Get the index of the specified color</title>
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<div class="refnamediv">
<h1 class="refname">imagecolorexact</h1>
<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">imagecolorexact</span> — <span class="dc-title">Get the index of the specified color</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.imagecolorexact-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">int</span> <span class="methodname"><strong>imagecolorexact</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>
)</div>
<p class="para rdfs-comment">
Returns the index of the specified color in the palette of the
image.
</p>
<p class="para">If you created the image from a file, only colors used in the image are resolved. Colors present only in the palette are not resolved.</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.imagecolorexact-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>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.imagecolorexact-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns the index of the specified color in the palette, or -1 if the
color does not exist.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.imagecolorexact-examples">
<h3 class="title">Examples</h3>
<div class="example" id="example-3191">
<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 /></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">$colors</span><span style="color: #007700">[] = </span><span style="color: #0000BB">imagecolorexact</span><span style="color: #007700">(</span><span style="color: #0000BB">$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">);<br /></span><span style="color: #0000BB">$colors</span><span style="color: #007700">[] = </span><span style="color: #0000BB">imagecolorexact</span><span style="color: #007700">(</span><span style="color: #0000BB">$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">);<br /></span><span style="color: #0000BB">$colors</span><span style="color: #007700">[] = </span><span style="color: #0000BB">imagecolorexact</span><span style="color: #007700">(</span><span style="color: #0000BB">$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">);<br /></span><span style="color: #0000BB">$colors</span><span style="color: #007700">[] = </span><span style="color: #0000BB">imagecolorexact</span><span style="color: #007700">(</span><span style="color: #0000BB">$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">);<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] => 0
[2] => 16777215
[3] => 6618932
)
</pre></div>
</div>
</div>
</div>
<div class="refsect1 seealso" id="refsect1-function.imagecolorexact-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.imagecolorclosest.html" class="function" rel="rdfs-seeAlso">imagecolorclosest()</a> - Get the index of the closest color to the specified color</span></li>
</ul>
</p>
</div>
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