Pop\Image\Gd::setOpacity PHP 메소드

Set the opacity.

public setOpacity ( integer \| string $opac ) : Gd
$opac	integer \| string
리턴	Gd

    public function setOpacity($opac)
    {
        $this->opacity = round(127 - 127 * ($opac / 100));
        return $this;
    }