Hi all. An extremely simple question: I am trying to record a normal 4-plane clip into a 1-plane clip file (only luminity information, black and white).

I use [rgb2luma] which results of course in a 1 plane matrix, but when I try to record it on a file with [jit.record] it becomes a 4-plane video again. I checked the documentation but I didn't see how to do this ... Any suggestion? Thanks