import matplotlib.pyplot as plt
plt.figure(figsize=(10, 5))
plt.subplot(1, 2, 1)
plt.imshow(black_white_image, cmap='gray')
plt.title('Original Image')
plt.axis('off')

plt.subplot(1, 2, 2)
plt.imshow(tmp, cmap='gray')
plt.title('Output Image with Black Patches')
plt.axis('off')

plt.show()