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how to make two images only different from the brightness become the same

I take out two images only different from the  brightness. I want to make them subtract with the function absdiff of OpenCV. But fail, how can I make them become the same.

how to make two images only different from the brightness become the same

I take out two images only different from the  brightness. I want to make them subtract with the function absdiff of OpenCV. But fail, how can I make them become the same.
Thanks!

how to make two images only different from the brightness become the same

I take out two images only different from the brightness. I want to make them subtract with the function absdiff of OpenCV. But fail, how can I make them become the same. Thanks!

Thanks!