How to affect only the alpha layers in post fx

How-To
1

is there a way to get the RGB and alpha data out of the Post fx split into its parts?
for example, being able to blur the alpha on the Mobius fx?
or apply pixel sorting to the alpha to break it up?

2

Most Post-Fx nodes have an Affected Channels section.
Make sure only the Alpha is selected there and you should get the post-fx effect to be applied only on the alpha.

There’s also the Channel Boolean node, which you can use to split RGB and Alpha channels into different Video Nulls, so you can further add different post-fx on each.

3 Likes
3

Thanks, can’t wait to check that out