Distinguishing clipped values in `colorbar`

Question

I have a pcolormesh plot wherein the color map is clipped by setting vmin and and vmax to strictly within the range of the values plotted. Is there a way to have the associated colorbar detatch a chunk from the bottom and from the top to signify that the relevant colors are outside the range of the color map?

Answer 1

Yes, you need to use the extend = both keyword for the colorbar, and then set the over and under colors for the colormap of the pcolormesh object

import matplotlib.pyplot as plt
import numpy as np

data=np.random.rand(10,10)

fig=plt.figure()
ax=fig.add_subplot(111)

p=ax.pcolormesh(data,vmin=0.2,vmax=0.8,cmap='gray')

p.cmap.set_over('red')
p.cmap.set_under('blue')

fig.colorbar(p,extend='both')

plt.show()