public function resizeExactWidth(&$image, $newWidth)
    {

        $width  = $image->getWidth();
        $height = $image->getHeight();
        $ratio  = $width / $height;

        $resizeWidth  = $newWidth;
        $resizeHeight = round($newWidth / $ratio);

        $this->_resize($image, $resizeWidth, $resizeHeight);

        return $this;
    }