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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="imagickkernel.addunitykernel" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>ImagickKernel::addUnityKernel</refname>
<refpurpose>Adds a Unity Kernel to the kernel list</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<modifier>public</modifier> <type>void</type><methodname>ImagickKernel::addUnityKernel</methodname>
<methodparam><type>float</type><parameter>scale</parameter></methodparam>
</methodsynopsis>
<para>
Adds a given amount of the 'Unity' Convolution Kernel to the given pre-scaled
and normalized Kernel. This in effect adds that amount of the original image
into the resulting convolution kernel. The resulting effect is to convert the
defined kernels into blended soft-blurs, unsharp kernels or into sharpening kernels.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
&no.function.parameters;
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title> <function>ImagickKernel::addUnityKernel</function></title>
<programlisting role="php">
<![CDATA[
<?php
function renderKernelTable($matrix) {
$output = "<table class='infoTable'>";
foreach ($matrix as $row) {
$output .= "<tr>";
foreach ($row as $cell) {
$output .= "<td style='text-align:left'>";
if ($cell === false) {
$output .= "false";
}
else {
$output .= round($cell, 3);
}
$output .= "</td>";
}
$output .= "</tr>";
}
$output .= "</table>";
return $output;
}
$matrix = [
[-1, 0, -1],
[ 0, 4, 0],
[-1, 0, -1],
];
$kernel = \ImagickKernel::fromMatrix($matrix);
$kernel->scale(1, \Imagick::NORMALIZE_KERNEL_VALUE);
$output = "Before adding unity kernel: <br/>";
$output .= renderKernelTable($kernel->getMatrix());
$kernel->addUnityKernel(0.5);
$output .= "After adding unity kernel: <br/>";
$output .= renderKernelTable($kernel->getMatrix());
$kernel->scale(1, \Imagick::NORMALIZE_KERNEL_VALUE);
$output .= "After renormalizing kernel: <br/>";
$output .= renderKernelTable($kernel->getMatrix());
echo $output;
?>
]]>
</programlisting>
</example>
<example>
<title> <function>ImagickKernel::addUnityKernel</function></title>
<programlisting role="php">
<![CDATA[
<?php
function addUnityKernel($imagePath) {
$matrix = [
[-1, 0, -1],
[ 0, 4, 0],
[-1, 0, -1],
];
$kernel = ImagickKernel::fromMatrix($matrix);
$kernel->scale(4, \Imagick::NORMALIZE_KERNEL_VALUE);
$kernel->addUnityKernel(0.5);
$imagick = new \Imagick(realpath($imagePath));
$imagick->filter($kernel);
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
}
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
</refentry>
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