<?php
if ( $_GET[pattern] )
        { $pattern = trim($_GET[pattern]); }
else {$pattern = "checkerboard"; }
$image = new Imagick();
$image->newPseudoImage( 140, 25, "pattern:$pattern" );
$image->setImageFormat("png");
header( "Content-Type: image/png" );
echo $image;
?>