How to 'turn off' blurry effect of imshow() in matplotlib?

Question

I want to make a color plot of probabilities however imshow generates blurry values for points which have zero probability. How can I get rid of this blurry periphery around

Answer 1

By default (which is changed mpl 2.0), imshow interpolates the data (as you would want to do for an image). All you need to do is tell it to not interpolate:

im = plt.imshow(..., interpolation='none')

'nearest' will also work for what you want. See smoothing between pixels of imagesc\imshow in matlab like the matplotlib imshow for examples of all of the kinds of interpolation.

doc

Answer 2

You may also use:

im = plt.imshow(..., interpolation='nearest')

This works especially well for discrete variables.