How can I quantify difference between two images?

Here’s what I would like to do:

I’m taking pictures with a webcam at regular intervals. Sort of like a time lapse thing. However, if nothing has really changed, that is, the picture pretty much looks the same, I don’t want to store the latest snapshot.

I imagine there’s some way of quantifying the difference, and I would have to empirically determine a threshold.

I’m looking for simplicity rather than perfection.
I’m using python.

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