[Python] How to compare the contents of two images using sikuli?

import shutil
import os
wait(5)
dir = os.path.dirname(getBundlePath()) # the folder, where your script is stored
img = capture(SCREEN) # snapshots the screen
shutil.move(img, os.path.join(dir, "shot.png")) # to make it persistent
wait(10)
dir = os.path.dirname(getBundlePath()) # the folder, where your script is stored
img2 = capture(SCREEN) # snapshots the screen
shutil.move(img2, os.path.join(dir, "shot2.png")) # to make it persistent
if img == img2:
popup("hello")
else:
popup("hi")


It is always giving pop up hi not hello... though i haven't changed the screen.

I can understand that these two are two different images names that's why always the else block is working. But is it possible to compare these two images. Contents of two images where there is some difference between the two. Was unable to upload the code so have commented it.. Help if anyone knows.

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