

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


img = cv2.imread('watch.jpg', cv2.IMREAD_GRAYSCALE)

cv2.imshow('image', img)
cv2.waitKey(0)
cv2.destroyAllWindows()


#plt.imshow(img, cmap = 'gray', interpolation='bicubic')
#plt.xticks([]), plt.yticks([])  #to hide tick values on X and Y axis
#plt.plot([200, 300, 400], [100, 200, 300], 'c', linewidth = 5)
#plt.show()

cv2.imwrite('watchgray.png', img)