Pop\Image\Imagick::setQuality PHP Метод

    public function setQuality($q = null)
    {
        $this->quality = null !== $q ? (int) $q : null;
        return $this;
    }

 public function testPng()
 {
     $i = new Imagick(__DIR__ . '/../tmp/test.png');
     $i->setQuality(75)->setOpacity(50)->setCompression(50)->setFilter(\Imagick::FILTER_BESSEL)->setBlur(2)->setOverlay(__DIR__ . '/../tmp/test.png')->resizeToWidth(240);
     $this->assertEquals(240, $i->getWidth());
 }