Bug report

Bug summary

With imshow(), image interpolation gives wrong results near pixels with values exceeding vmax. A large rectangular region (given by the interpolation kernel size) is filled with color corresponding to maximum value.

Code for reproduction

t = zeros((50, 50))
t[10, 10] = 1
t[10, 20] = 2
imshow(t, vmin=0, vmax=1, interpolation='lanczos')

see gist

Actual outcome

Expected outcome

Ok with matplotlib 2.0.0

Matplotlib version

• Operating System: macOS
• Matplotlib Version: 2.0.1, 2.0.2
• Python Version: 2.7
• Jupyter Version (if applicable):
• Other Libraries:

matplotlib installed via conda-forge