title: Set the size of imsave() image output
body: <p>I have array with shape 15x30, and want to save it as pseudocolor plot with <code>imsave()</code> in pylab mode. However the size of the output image produced is 15x30px. I tried setting dpi parameter, but it doesn't help nor this function have any other parameter that will change the image size.  </p>
  
  <p>So how can I save pseudocolor image from array, with <code>imsave()</code> and change the size of output image?</p>