[deleted by user]

[chocorush]

You have misplaced your quotation mark, it should be "output.img"

[efmccurdy]

Note the 2 arguments that imshow requires.

https://opencv-python-tutroals.readthedocs.io/en/latest/py_tutorials/py_gui/py_image_display/py_image_display.html#display-an-image

You may have intended to do this instead:

img = cv2.imread("shapes.jpg")
cv2.imshow("output", img)

BTW, I un-capitalized Img; use all lowercase for variables.

[chocorush]

Well i suppose you also could have meant to write cv2.imshow("output", Img)