I am finding that matplotlib v1.3.0 will blur the edges of an image's pixels when I use interpolation = 'none' and save the image as a pdf. For example, the following code z = np.array([[0.25, 0.75, 1 ...

This should however be making an image which looks like interpolation='nearest'. Furthermore, the interpolation=None implies that the image should not be resampled, for example when outputting to ...