title: Converting jpg to greyscale
body: <p>I'm trying to convert an image to greyscale as part of a set of instructions I'm following. However, it won't let me save after making it greyscale.</p>
  
  <p>Error:</p>
  
  <pre><code>    img2.save("img.jpg")
    File "/Library/Python/2.7/site-packages/PIL/Image.py", line 1698, in save
      save_handler(self, fp, filename)
    File "/Library/Python/2.7/site-packages/PIL/JpegImagePlugin.py", line 586, in _save
      raise IOError("cannot write mode %s as JPEG" % im.mode)
  IOError: cannot write mode LA as JPEG
  </code></pre>
  
  <p>Code: </p>
  
  <pre><code>img = Image.open(fname)
  img2 = img2.convert('LA')
  img2.save("img.jpg")
  </code></pre>