Hi Chris,
I have a similar situation and was wondering if you could please re upload your ‘matte controls adjustment layer’ file?
I am creating miniature watercolor animations and would like to bring them into after effects and layer them into the same composition.
I have been playing around with frame blending and the problem I have is that if I want to move one of my watercolor animations around the frame I can see the edges of the animations frame because it is not pure white. It is very close to pure white but not exactly. I think your file might be of help!
I don’t need an alpha channel, just a way of masking the edges of my composition.
Hope to hear from you,
Simon
🙂