Tue Feb 02, 2021 5:33 am
If you change Cineform "type" to RGB 16-bit, the "Export Alpha" checkbox appears. Rendering reversed clips shouldn't change anything. If you're having trouble, try one that's not reversed. There's a lot of ways to mess up alpha export and import with Resolve. If you can't export it successfully, then you might not have wired up the alpha output on the color page. If you can't import it, then you might need to "add source" on the color page, and pipe the new green global input into a blue alpha node input. There are other ways to "import as alpha matte" when you only need the alpha, and I *think* you can even drag-and-drop, although I don't remember the specifics of that.
-MacBook Pro (14,3) i7 2.9 GHz 16 GB, Intel 630, AMD 560 x1
-[DR 17.0 Beta9]