title: imnoise in Python?
body: <p>I'm trying to add white noise to an image after applying a lowpass filter. I know how to do it in matlab but don't know what to call for it to work in python.</p>
  
  <pre><code>import matplotlib.pyplot as plt
  import numpy as np
  import scipy.misc
  from scipy import ndimage
  import Image 
  
  J = imnoise(im,'salt &amp; pepper',0.02);
  figure.imshow(J)
  </code></pre>
  
  <p>What else do I need to import? Or is there another way to add noise? </p>