33-Histogram_3.py

import cv2
import numpy as np
import matplotlib.pyplot as plt

img = cv2.imread("smile.jpg")
b,g,r = cv2.split(img)

cv2.imshow("image",img)
plt.hist(b.ravel() , 256 , [0,256])
plt.hist(g.ravel() , 256 , [0,256])
plt.hist(r.ravel() , 256 , [0,256])

plt.show()

cv2.waitKey(0)
cv2.destroyAllWindows()