Matte refining (RGB bleeding technique)

Hi there community

i’ve got a question about one of the approaches on how to fix a comp when you have black or white fringing on the talent’s edges while having the opposite values in the BG to be comped.

I’ve seen seasoned compers extending the useful rgb color pixels until they cover the unwanted areas while keeping the matte untouched.

Can anyone lead me towards the node workflow of that in Nuke?
I’m intested in understanding the process.

thank you!

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