title: PIL.Image.save() to an FTP server
body: <p>Right now, I have the following code:</p>
  
  <pre><code>pilimg = PILImage.open(img_file_tmp) # img_file_tmp just contains the image to read
  pilimg.thumbnail((200,200), PILImage.ANTIALIAS)
  pilimg.save(fn, 'PNG') # fn is a filename
  </code></pre>
  
  <p>This works just fine for saving to a local file pointed to by <code>fn</code>. However, what I would want this to do instead is to save the file on a remote FTP server.</p>
  
  <p>What is the easiest way to achieve this?</p>