title: Change resolution of imshow in ipython
body: <p>I am using ipython, with a code that looks like this:</p>
  
  <pre><code>image = zeros(MAX_X, MAX_Y)
  
  # do something complicated to get the pixel values...
  # pixel values are now in [0, 1].
  
  imshow(image)
  </code></pre>
  
  <p>However, the resulting image always has the same resolution, around (250x250). I thought that the image's dimensions would be (MAX_X x MAX_Y), but that is seemingly not the case. How can I make ipython give me an image with a greater resolution?</p>