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

new_image_path is a Path…?! Perhaps imwrite requires it to be a string…? — deceze
– deceze ♦, Commented Dec 16, 2020 at 12:08
The path in cv2.imwrite cannot be a Path. Wrap your Path object in str() and it shall work. — Fanchen Bao
– Fanchen Bao, Commented Dec 16, 2020 at 23:05
Please past directly from code, rather than trying to retype. Both of those fragments have syntax errors due to missing single quotes. — Dave W. Smith
– Dave W. Smith, Commented Dec 17, 2020 at 5:54

Ophir S · Accepted Answer · 2021-02-08 18:15:58Z

11

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])

answered Feb 8, 2021 at 18:15

Ophir S

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