Create Favicon With Imagick

<?php
    try
    {
        /*** set the image name ***/
        $img = 'test.jpg';

        /*** read the image into imagick ***/
        $Imagick = new Imagick($img);

        /*** crop and thumbnail the image ***/
        $Imagick->cropThumbnailImage(16,16);

        /*** set the format to ico ***/
        $Imagick->setFormat('ico');

        /*** write the favicon.ico file ***/
        $Imagick->writeImage("favicon.ico");

        echo 'done';
    }
    catch(Exception $e)
    {
        echo $e->getMessage();
    }
?>