title: Numpy image - rotate matrix 270 degrees
body: <p>I've got a Numpy 2d array that represents a grey-scale image and I need to rotate it 270 degrees.  Might be being a bit thick here but the two ways I can find to do this seem quite... circulous:</p>
  
  <pre><code>rotated = numpy.rot90(numpy.rot90(numpy.rot90(orignumpyarray)))
  
  rotated = numpy.fliplr(numpy.flipud(numpy.rot90(orignumpyarray)))
  </code></pre>
  
  <p>I'm thinking there must be a better way to do this in one operation.  Basically a rot270() function?  Any ideas? </p>