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How can I convert fastai image from open_image() format to opencv?

I have image opened this way in fast.ai:

 img = open_image(img_f)

How do I show it with cv2.imshow ?

FastAi already uses this package to work with images. When you do open_image function check the doc string:

def open_image(fn):
    """ Opens an image using OpenCV given the file path.

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