Question about cartoon effect

[Scasey]

Is it possible using the cartoon effect to create white edges with transparency? I only see how to make black edges with white filler. The project I'm working on is a blueprint graphic. I want to have interview footage start as a still frame (white outlines of the person on the blue paper). As they begin speaking I will blend in the original footage, then as they finish it goes back to white outlines.

Any tips are appreciated.

thx,

Steven

[Mylenium · Accepted solution]

The Invert effect is your friend as are Channel Combiner and others to create transparency from (inverted) luminance and/or for use luma track mattes.

Mylenium

[Scasey]

That did it! Thank you for the quick response.