Python source code: plot_interpolation_lena.py

import matplotlib.pyplot as plt

l = scipy.misc.lena()

plt.figure(figsize=(8, 4))

plt.subplot(121)
plt.imshow(l[200:220, 200:220], cmap=plt.cm.gray)
plt.axis('off')

plt.subplot(122)
plt.imshow(l[200:220, 200:220], cmap=plt.cm.gray, interpolation='nearest')
plt.axis('off')

plt.subplots_adjust(wspace=0.02, hspace=0.02, top=1, bottom=0, left=0, right=1)
plt.show()