public function getRelativeCenterX()
    {
        $pos = 50;
        if ($this->FaceCentreX > 0 && $this->OriginalWidth > 0) {
            $pos = $this->FaceCentreX / $this->OriginalWidth * 100;
            $pos = ($pos > 100 || $pos < 0) ? 50 : $pos;
        }

        return $pos;
    }