'Why is the difference of my two images blank?

I tried to get the difference of two images. Here are my two images.

However, I only got a blank image like this

I use OpenCV package in python. The code I use is:

image3 = image1 - image2
plt.imshow(image3)
plt.show()

The backgrounds of the two images are not the same. I don't understand why the difference of the two images is just blank. Can someone help me with this?

Thank you in advance.

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'Why is the difference of my two images blank?

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