matplot_pil.py

#!/usr/bin/env python 

import cv2
from matplotlib import pyplot as plt 
import matplotlib.image as mpimg 

original = mpimg.imread('home_tree.png') 
gray = cv2.imread('home_tree.png',0) 

plt.subplot(131),plt.imshow(gray, cmap = 'gray'),plt.title('Grayscale Image')
plt.xticks([]), plt.yticks([]) 

plt.subplot(133),plt.imshow(original, cmap='gray'),plt.title('Original Image')
plt.xticks([]), plt.yticks([])

plt.show()