/**
* Scale the image by a given height
*
* @param int $height
*
* @return static
*/
public function scaleFixedHeight($height)
{
$_width = $this->adapter->getWidth();
$_height = $this->adapter->getHeight();
$width = (int) ($_width * $height / $_height);
$this->adapter->resize($width, $height);
return $this;
}