public function bandrank($other, array $options = []): Image
    {
        /* bandrank will appear as a static class member, as
         * Image::bandrank([a, b, c]), but it's better as an instance
         * method.
         *
         * We need to define this by hand.
         */

        /* Allow a single unarrayed value as well.
         */
        if ($other instanceof Image) {
            $other = [$other];
        } else {
            $other = (array) $other;
        }

        return self::call('bandrank', $this, $other, $options);
    }