code: def save(url, *args, **kwargs):
      
  
      device = heimdallDevice(kwargs.get('device', None))
  
      kwargs['width'] = kwargs.get('width', None) or device.width
      kwargs['height'] = kwargs.get('height', None) or device.height
      kwargs['user_agent'] = kwargs.get('user_agent', None) or device.user_agent
  
      screenshot_image = screenshot(url, **kwargs)
  
      if kwargs.get('optimize'):
          image = Image.open(screenshot_image.path)
          image.save(screenshot_image.path, optimize=True)
  
      return screenshot_image
docs: Parse the options, set defaults and then fire up PhantomJS.