Beans_Lessc::lib_lighten PHP Method

    protected function lib_lighten($args)
    {
        list($color, $delta) = $this->colorArgs($args);
        $hsl = $this->toHSL($color);
        $hsl[3] = $this->clamp($hsl[3] + $delta, 100);
        return $this->toRGB($hsl);
    }