cv2.imwrite() SystemError: <built-in function imwrite> returned NULL without setting an error

Question

I'm tring to save an np array as an image. The problem is that, if I write the path in the imwrite function it works, but if i store it in a variable and then use this variable as path it doesn't work and returns an error.

This works:

cv2.imwrite('my/path/to/image.png', myarray[...,::-1])

This doesn't work

new_image_path = path/'{}+.png'.format(np.random.randint(1000))
cv2.imwrite(new_image_path, myarray[...,::-1])

And it returns this error:

SystemError: <built-in function imwrite> returned NULL without setting an error

Answer 1

The method cv2.imwrite does not work with the Path object. Simply convert it to string when you call the method:

cv2.imwrite(str(new_image_path), myarray[...,::-1])