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<h1 class="refname">Imagick::unsharpMaskImage</h1>
<p class="verinfo">(PECL imagick 2.0.0)</p><p class="refpurpose"><span class="refname">Imagick::unsharpMaskImage</span> — <span class="dc-title">Sharpens an image</span></p>
</div>
<div class="refsect1 description" id="refsect1-imagick.unsharpmaskimage-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">bool</span> <span class="methodname"><strong>Imagick::unsharpMaskImage</strong></span>
( <span class="methodparam"><span class="type">float</span> <code class="parameter">$radius</code></span>
, <span class="methodparam"><span class="type">float</span> <code class="parameter">$sigma</code></span>
, <span class="methodparam"><span class="type">float</span> <code class="parameter">$amount</code></span>
, <span class="methodparam"><span class="type">float</span> <code class="parameter">$threshold</code></span>
[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$channel</code><span class="initializer"> = Imagick::CHANNEL_ALL</span></span>
] )</div>
<p class="para rdfs-comment">
Sharpens an image. We convolve the image with a Gaussian operator of the given
radius and standard deviation (sigma). For reasonable results, radius should be
larger than sigma. Use a radius of 0 and Imagick::UnsharpMaskImage() selects a
suitable radius for you.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-imagick.unsharpmaskimage-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">radius</code></em></span>
<dd>
<p class="para">
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">sigma</code></em></span>
<dd>
<p class="para">
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">amount</code></em></span>
<dd>
<p class="para">
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">threshold</code></em></span>
<dd>
<p class="para">
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">channel</code></em></span>
<dd>
<p class="para">
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-imagick.unsharpmaskimage-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns <strong><code>TRUE</code></strong> on success.
</p>
</div>
<div class="refsect1 errors" id="refsect1-imagick.unsharpmaskimage-errors">
<h3 class="title">Errors/Exceptions</h3>
<p class="para">
Throws ImagickException on error.
</p>
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