# Python opencv-Writing numpy object data to image file

in opencv we can read in an image using cv2.imread() or np.fromstring(f.read(), np.uint8) followed by img = cv2.imdecode(nparr, 0), for my use case I am bound to use :

with open("sample.png", "r") as f:

Now I want to reverse the scenario that is, getting a file object of .png format from the given numpy array. So let's assume that I have a numpy array as nparr = np.zeros((200, 200, 3)). Then how can I convert it to a binary string and write it to dest.png ? I used cv2.imencode(".png", img, [cv2.IMWRITE_PNG_COMPRESSION])[1], but it returns a ndarray object as well