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Is there an open source underlying library as part of your service? Would love to start using it in smaller projects :) great job BTW

Given its produced by a ".ai" company I would imagine they are using a U-Net derived ML model and not traditional OpenCV methods.

You can read more about that approach here:

Good results though for sure and very handy for quick image edits.

Yup. Multiple u-nets, actually.

This method requires a video or at least multiple frames. It won't work for a single photo.