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# calculate frequencies for histogram
hist1 = cv2.calcHist([myimage],[0],None,[256],[0,256]) 
  
# show the histogram of original image 
plt.plot(hist1)
plt.title("Original")
plt.show()


hist2 = cv2.calcHist([equalized_img],[0],None,[256],[0,256]) 
  
# show the histogram of equalized image 
plt.plot(hist2) 
plt.title("Equalized")
plt.show()