public function resizeExactHeight(&$image, $newHeight)
    {

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

        $resizeHeight = $newHeight;
        $resizeWidth  = $newHeight * $ratio;

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

        return $this;
    }