using cv2 to readresize files

You’re failing to read the image, most likely you’re not giving the full path of the image to the cv2.imread function, so the cv2.resize function receives None

You need something like this:

cv2.imread(os.path.join(image_path, image), cv2.IMREAD_COLOR)

Make sure you import os first at the top of your code.

Fill image_path variable with the path of the image.