Why is the difference of my two images blank?-CodePudding

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.

CodePudding user response：

This works fine for me in Python/OpenCV using cv2.absdiff(). I suggest you use cv2.imshow() to view your results and cv2.imwrite() to save your results.

import cv2
import numpy as np

image1 = cv2.imread('image1.png')
image2 = cv2.imread('image2.png')

diff = cv2.absdiff(image1, image2)
print(np.amin(diff), np.amax(diff))

cv2.imwrite('diff.png', diff)
cv2.imshow('diff', diff)
cv2.waitKey(0)

Result:

Min and Max Values In Diff:
0 91