title: Image editing in python
body: <p>I am looking for a python module that will allow me to import an image from my disk and do the following manipulations :-</p>
  <ul>
  <li><p>Convert a black colour pixel to white.</p>
  </li>
  <li><p>Convert all othe colored pixels to white.</p>
  </li>
  </ul>
  <p>So as to obtain a pure black and white image.
  Since they are so many of modules related to image editing so I am unable to decide which one to use ?</p>
  <p>Please Help.</p>