php-doc-en/reference/imagick/imagickpixeliterator/construct.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="imagickpixeliterator.construct">
 <refnamediv>
  <refname>ImagickPixelIterator::__construct</refname>
  <refpurpose>The ImagickPixelIterator constructor</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <methodname>ImagickPixelIterator::__construct</methodname>
   <methodparam><type>Imagick</type><parameter>wand</parameter></methodparam>
  </methodsynopsis>
  &warn.undocumented.func;
  <para>
   The ImagickPixelIterator constructor
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &imagick.return.success;
  </para>
 </refsect1>



 <refsect1 role="examples">
  &reftitle.examples;
  <para>
    <example>
      <title> <function>ImagickPixelIterator::construct</function></title>
      <programlisting role="php">
      <![CDATA[
<?php
function construct($imagePath) {
    $imagick = new \Imagick(realpath($imagePath));
    $imageIterator = new \ImagickPixelIterator($imagick);

    /* Loop through pixel rows */
    foreach ($imageIterator as $pixels) { 
        /* Loop through the pixels in the row (columns) */
        foreach ($pixels as $column => $pixel) { 
            /** @var $pixel \ImagickPixel */
            if ($column % 2) {
                /* Paint every second pixel black*/
                $pixel->setColor("rgba(0, 0, 0, 0)");
            }
        }
        /* Sync the iterator, this is important to do on each iteration */
        $imageIterator->syncIterator();
    }

    header("Content-Type: image/jpg");
    echo $imagick;
}

?>
]]>
      </programlisting>
    </example>
  </para>
 </refsect1>

</refentry>

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