ColourMatte node

I’m trying to roto a girl’s hair ( which is dark ), against a background ( which is light ). It’s a;most impossible to roto with the Roto node, so I’m opting for other ways to achieve this. Can someone explain the F_ColourMatte node to me, or maybe other ways of achieving this tricky roto? Is F_ColourMatte a good way to do this?



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