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

img = cv2.imread('watch.jpg', cv2.IMREAD_GRAYSCALE)
#IMREAD_COLOR = 1
#IMREAD_UNCHANGED = -1

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

plt.imshow(img, cmap='gray', interpolation='bicubic')
plt.plot([0,0],[800,600],'c', linewidth=15)
plt.show()

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