Graphic Design User Help

Color removal followed by transparency reproduction

I have a bunch of images I’d like to remove the background color of and replace with 100% transparent background. I also have semi-transparent rectangles which I need to "color correct".

To illustrate my case here is an example image: Magenta background. 40% transparency yellow rectangle on top of a fully opaque blue circle.

enter image description here

Removing the background, which is straight forward, I get this:

enter image description here

So now my question is how do I get the rectangle to be a transparent yellow instead of the orange tint it originally had, at the same time keep the color of the overlapping area between circle and rectangle?

enter image description here

I’m looking for any kind of solution. It could be program specific or code based (algorithm).

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