public function partialPixelate($amount = 10, $blur = 4, $objects = [], $type = 'rect')
    {

        // call TransformationMixin function
        $this->setTransformUrl('partial_pixelate', ['a' => $amount,
            'l' => $blur, 'o' => $objects, 't' => $type]);

        return $this;
    }