Setting default parameters for imshow in pyplot

I find default visualization settings for images in matplotlib inconvenient. Usually I prefer to see images in grayscale color map and without smoothing. Thus I see actual data without distortions. Grayscale is easier to understand.

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import matplotlib.pyplot as plt
plt.rcParams['image.cmap'] = 'gray'
plt.rcParams['image.interpolation'] = 'nearest'

Compare default colors and interpolation:

and after applying the settings: