import cv2

image_path = "G:\Save Files\Python Save Files\CV Tutorials\images"

image = cv2.imread (image_path + "\Art Amber.jpg", 0)

ret, tozero_threshold = cv2.threshold(image, 120, 255, cv2.THRESH_TOZERO)

cv2.imshow('Set to Zero Threshold', tozero_threshold)

cv2.waitKey(0)
cv2.destroyAllWindows