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Permanently remove keyed out area, even after the color key fades

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Kjeld Schmidt
Permanently remove keyed out area, even after the color key fades
on Jul 25, 2016 at 9:06:42 pm

Hey,

I'm trying to achieve an 'erasing' effect. Basically, imagine a blue ball roling over a green background. Everywhere the blue ball has rolled to should permanently turn transparent.

Keying the blue ball is trivial. When setting out for this project, I expected to be able to 'export' the keylight data in some form onto a mask layer, presumably by using a, possibly compley, expression.

However, I fail to both see and successfuly google a way to get useful data from the keylight effect.

Can you imagine any way this is possible?

Thank you very much,
Best regards.


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