title: Pillow Attribute Error
body: <p>I want to set up an imagestream from my rbpi to my server.</p>
  
  <p>So I would like to setup a network stream discripted in the <a href="http://picamera.readthedocs.io/en/release-1.12/recipes1.html#streaming-capture" rel="nofollow">http://picamera.readthedocs.io/en/release-1.12/recipes1.html#streaming-capture</a>.</p>
  
  <p>This worked well, but now I want to save the captured Image.</p>
  
  <p>-> (modified the server script)</p>
  
  <pre><code>import io
  import socket
  import struct
  from PIL import Image
  
  # Start a socket listening for connections on 0.0.0.0:8000 (0.0.0.0 means
  # all interfaces)
  server_socket = socket.socket()
  server_socket.bind(('0.0.0.0', 8000))
  server_socket.listen(0)
  
  # Accept a single connection and make a file-like object out of it
  connection = server_socket.accept()[0].makefile('rb')
  try:
      while True:
          # Read the length of the image as a 32-bit unsigned int. If the
          # length is zero, quit the loop
          image_len = struct.unpack('&lt;L', connection.read(struct.calcsize('&lt;L')))[0]
          if not image_len:
              break
          # Construct a stream to hold the image data and read the image
          # data from the connection
          image_stream = io.BytesIO()
          image_stream.write(connection.read(image_len))
          # Rewind the stream, open it as an image with PIL and do some
          # processing on it
          image_stream.seek(0)
          image = Image.open(image_stream)
          print('Image is %dx%d' % image.size)
          image.verify()
          print('Image is verified')
          im = Image.new("RGB", (640,480), "black") #the saving part
          im = image.copy()
          im.save("./img/test.jpg","JPEG")
  finally:
      connection.close()
      server_socket.close()
  </code></pre>
  
  <p>But it returns me following errorcode:</p>
  
  <pre><code>Traceback (most recent call last):
    File "stream.py", line 33, in &lt;module&gt;
      im = image.copy()
    File "/usr/lib/python2.7/dist-packages/PIL/Image.py", line 781, in copy
      self.load()
    File "/usr/lib/python2.7/dist-packages/PIL/ImageFile.py", line 172, in load
      read = self.fp.read
  AttributeError: 'NoneType' object has no attribute 'read'
  </code></pre>
  
  <p>How can I fix this?</p>