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<title>Get the index of the specified color + alpha or its closest possible alternative</title>
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<div class="refnamediv">
<h1 class="refname">imagecolorresolvealpha</h1>
<p class="verinfo">(PHP 4 >= 4.0.6, PHP 5)</p><p class="refpurpose"><span class="refname">imagecolorresolvealpha</span> — <span class="dc-title">Get the index of the specified color + alpha or its closest possible alternative</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.imagecolorresolvealpha-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">int</span> <span class="methodname"><strong>imagecolorresolvealpha</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">
This function is guaranteed to return a color index for a
requested color, either the exact color or the closest possible
alternative.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.imagecolorresolvealpha-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.imagecolorresolvealpha-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns a color index.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.imagecolorresolvealpha-examples">
<h3 class="title">Examples</h3>
<div class="example" id="example-3195">
<p><strong>Example #1 Using <span class="function"><strong>imagecoloresolvealpha()</strong></span> to get colors from an image</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">// Load an image<br /></span><span style="color: #0000BB">$im </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatefromgif</span><span style="color: #007700">(</span><span style="color: #DD0000">'phplogo.gif'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Get closest colors from the image<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">imagecolorresolvealpha</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$colors</span><span style="color: #007700">[] = </span><span style="color: #0000BB">imagecolorresolvealpha</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">200</span><span style="color: #007700">, </span><span style="color: #0000BB">127</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Output<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$colors</span><span style="color: #007700">);<br /><br /></span><span style="color: #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] => 89
[1] => 85
)
</pre></div>
</div>
</div>
</div>
<div class="refsect1 notes" id="refsect1-function.imagecolorresolvealpha-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.imagecolorresolvealpha-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>
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