I may have found a bug in the module image.py, class AxesImage, of
The method 'get_interpolation' has been defined twice. The first time
it returns the attribute '_interpolation' (the right one). A few lines later,
the second definition returns the attribute '_resample' (the wrong one ?).
So, when you call 'get_interpolation' from an AxesImage instance such as
'imshow' it returns False instead of the proper interpolation scheme.