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

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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.

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