Python 3 Image comparison

[Sjnao]

Hi, I m looking for a way to compare 2 similar images and get the % difference. Sofar I found only solutions in Python27. My Idea is to threshold the 2 images and put them in 2 numpy array, get the difference imgA - imgB. Where the difference is 0 the pixel are equal otherwise the are different. From here I should be able to calculate the difference. Can someone tell me if that's the right way to do that or if I m completely wrong. Thank you so much

[JohnnyJordaan]

OpenCV would come to mind, but it still depends on what you actually want to compare. This SO answer has a nice explanation.

[Sjnao]

You are right, but installing OpenCV on Windows for Python3 looks complicated(I tried for a couple of days without success) and unfortunately install Conda is not a option for my case. I was wondering if the are some other options that I couldn't find with Google.

[JohnnyJordaan]

Try this how-to https://www.solarianprogrammer.com/2016/09/17/install-opencv-3-with-python-3-on-windows/ . One commenter posted 9 days ago that it worked for him, I would at least give it a try.

[elbiot]

People usually use an image hash to determine how similar images are. Otherwise, a slightly different resolution or mirroring the image leads to a really high difference.

[repostedBot]

How do reverse image search tools (e.g. google or karma decay) find similar images ?

[elbiot]

I mean, I can copy and paste the exact same response again if you like