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I've also been facing the same issue, try doing this (it solved the issue for me):

img = np.ones((512,512,3)) #img is the background image which appears when you run the program

For getting a black background you can use the np.zeros() function

img = np.zeros((512,512,3))

And if you want any other color then try filling the matrix with your choice of numbers corresponding to RGB values of your choice as this is (512 X 512 X 3) matrix.