Shines a distant light on an image to create a three-dimensional effect. You control the positioning of the light with azimuth and elevation; azimuth is measured in degrees off the x axis and elevation is measured in pixels above the Z axis. This method is available if Imagick has been compiled against ImageMagick version 6.2.9 or newer.
function shadeImage($image_path)
{
    $imagick = new \Imagick(realpath($image_path));
    $imagick->shadeImage(true, 45, 20);
    header("Content-Type: image/jpeg");
    echo $imagick->getImageBlob();
}