Grafika\Imagick\Filter\Colorize::apply PHP Method

    public function apply($image)
    {
        // normalize colorize levels
        $red = $this->normalizeLevel($this->red);
        $green = $this->normalizeLevel($this->green);
        $blue = $this->normalizeLevel($this->blue);
        $qrange = $image->getCore()->getQuantumRange();
        $image->getCore()->levelImage(0, $red, $qrange['quantumRangeLong'], \Imagick::CHANNEL_RED);
        $image->getCore()->levelImage(0, $green, $qrange['quantumRangeLong'], \Imagick::CHANNEL_GREEN);
        $image->getCore()->levelImage(0, $blue, $qrange['quantumRangeLong'], \Imagick::CHANNEL_BLUE);
        return $image;
    }