'Why does my PNG image look different in OpenCV?

enter image description here

The image is downloaded from a slide captcha and I'm trying to find the gap in this image with OpenCV.

But the gap is missing in the image opened with cv2.imshow() . I am not familiar with PNG nor OpenCV so I'm so confused right now. I searched a lot but found nothing useful maybe caused by using wrong keywords.

image opened with Windows Viewer: enter image description here

image opened with cv2.imshow() : enter image description here

I'm wondering why the same image in image viewer and OpenCV looks different and is there an easy way to locate the difference?

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'Why does my PNG image look different in OpenCV?

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