public function getOrientation()
    {
        $width = $this->getWidth();
        $height = $this->getHeight();
        if ($width > $height) {
            return Image_Backend::ORIENTATION_LANDSCAPE;
        } elseif ($height > $width) {
            return Image_Backend::ORIENTATION_PORTRAIT;
        } else {
            return Image_Backend::ORIENTATION_SQUARE;
        }
    }