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<title>Returns the difference in one or more images</title>
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<h1 class="refname">Imagick::compareImageChannels</h1>
<p class="verinfo">(PECL imagick 2.0.0)</p><p class="refpurpose"><span class="refname">Imagick::compareImageChannels</span> — <span class="dc-title">Returns the difference in one or more images</span></p>
</div>
<div class="refsect1 description" id="refsect1-imagick.compareimagechannels-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">array</span> <span class="methodname"><strong>Imagick::compareImageChannels</strong></span>
( <span class="methodparam"><span class="type"><a href="class.imagick.html" class="type Imagick">Imagick</a></span> <code class="parameter">$image</code></span>
, <span class="methodparam"><span class="type">int</span> <code class="parameter">$channelType</code></span>
, <span class="methodparam"><span class="type">int</span> <code class="parameter">$metricType</code></span>
)</div>
<p class="para rdfs-comment">
Compares one or more images and returns the difference image.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-imagick.compareimagechannels-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">
Imagick object containing the image to compare.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">channelType</code></em></span>
<dd>
<p class="para">
Provide any channel constant that is valid for your channel mode. To
apply to more than one channel, combine channeltype constants using
bitwise operators. Refer to this
list of <a href="imagick.constants.html#imagick.constants.channel" class="link">channel constants</a>.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">metricType</code></em></span>
<dd>
<p class="para">
One of the <a href="imagick.constants.html#imagick.constants.metric" class="link">metric type constants</a>.
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-imagick.compareimagechannels-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Array consisting of <em>new_wand</em> and
<em>distortion</em>.
</p>
</div>
<div class="refsect1 errors" id="refsect1-imagick.compareimagechannels-errors">
<h3 class="title">Errors/Exceptions</h3>
<p class="para">
Throws ImagickException on error.
</p>
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