Source empty in function cvtColor

Python
2

Hi,
How do you know this in your code?

You have to check it :
https://docs.opencv.org/4.x/db/deb/tutorial_display_image.html

import cv2 as cv

import sys

img = cv.imread("starry_night.jpg")
if img is None:
    sys.exit("Could not read the image.")
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