title: In Python, Python Image Library 1.1.6, how can I expand the canvas without resizing?
body: <p>I am probably looking for the wrong thing in the handbook, but I am looking to take an image object and expand it without resizing (stretching/squishing) the original image.  </p>
  
  <p>Toy example: imagine a blue rectangle, 200 x 100, then I perform some operation and I have a new image object, 400 x 300, consisting of a white background upon which a 200 x 100 blue rectangle rests.  Bonus if I can control in which direction this expands, or the new background color, etc.</p>
  
  <p>Essentially, I have an image to which I will be adding iteratively, and I do not know what size it will be at the outset.  </p>
  
  <p>I suppose it would be possible for me to grab the original object, make a new, slightly larger object, paste the original on there, draw a little more, then repeat.  It seems like it might be computationally expensive.  However, I thought there would be a function for this, as I assume it is a common operation.  Perhaps I assumed wrong.</p>