"Maya style" unpremultiplied rendering

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I've noticed that when I try to render unpremultiplied “Extra image planes” using the minmax min pixel filter, it does affect the sampling on overlapping objects as well.

What I need is the behavior from Maya where the transition between overlapping objects is smooth, but the border, where the alpha goes from black to white normally, is unfiltered.

Hope what I mean makes some sense to you. Does anyone know how to achieve that look?
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Just unpremultiply in COPs or a compositor of your choice? (divide by alpha)

eetu.
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eetu
Just unpremultiply in COPs or a compositor of your choice? (divide by alpha)

eetu.

That did the trick.
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