import cv2
import numpy as np

imageSource = 'q4.jpg'
img = cv2.imread(imageSource,cv2.COLOR_BGR2GRAY)
cv2.imshow( "original", img )

result = img & 0b11111100

cv2.imshow( "out", result )
cv2.imwrite('out.jpg',result)
cv2.waitKey(0)
cv2.destroyAllWindows()