Nuke has a convenient toggle in its channel shuffle node where you can instantly turn a single channel fully white or black. For instance, if you want to fill your alpha completely with black in case there’s some errant matte in there from upstream.
I don’t think there’s a simple way to do this with Flame’s tools but I’d love to be proven wrong - or is there a Matchbox that does this?
Would a comp node with a single input into the front work? Then you can key frame the transparency as you like?
I frequently use a Gradient for something like this. I find it more convenient, tidier, and easier to understand later then using a Color Source and T tapping an upstream node.
Throw the Gradient on the pipe you want, then select the black or white triangle on the color slider, then hit Delete. Delete black if you want white, or vice versa. Its pretty fast and takes the resolution from the upstream.
both of these are great suggestions for my example. The truth is that I was using that as a very simple example, the actual reason I wanted a tool like this is I was building comps that needed to be rendered at different resolutions and I was looking for a solution that would allow me to feed empty channels into various nodes for various reasons that would automatically be set to the correct resolution based on a single input at the start. Shuffle in Nuke makes this relatively painless but Flame, would need some intervention for each variant of the batch tree.
Here you go… should do exactly what you want. Added two inputs like Nuke so you can mix and match from two sources.
Absolute LEGEND - thank you @cnoellert !
