Adding a transparent circle to an image on python with PIL

Question

I have a python program that craetes a png file with a circle on it. Now I want this circle to be semi transparent, given an alpha value.

Here is what I do:

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Answer 1

I used Image.composite(background, foreground, mask) to mask a semi transparent circle on a foreground.

I followed the instructions from here: Merging background with transparent image in PIL

Thanks to @gareth-res