How to use a video as a key for two other videos?

gpvillamil · Post by **gpvillamil** » Fri Apr 15, 2005 05:23

How do you do this in Resolume?

Let's say I have a black and white video, of a man walking, for example.

I want to replace the white parts of the video with a second video, and the black parts with a third video. In effect I'm using the first black and white video as the key for mixing the other two.

Can this be done? If so, how?

levon · Post by **levon** » Fri Apr 15, 2005 08:16

you cant do that in resolume, as the mixer plugins can only have 2 inputs.

gpvillamil · Post by **gpvillamil** » Fri Apr 15, 2005 09:53

Perhaps there is a way to do this by stacking up the videos with the mask in the middle?

continuity-B · Post by **continuity-B** » Fri Apr 15, 2005 14:48

You can get close to it in res using ad/li and da/mu

Can't remember exactly but I think your vids need to be quite contrasting to each other but with a minimal tonal range in themselves. Darken with the lighter clip and lighten with the darker clip (get it?). The darker clip shouldn't lighten the lighter clip too much and vice-versa.

It's not perfect and the heirarchy of the layers matters too but I can't remember just now and I'm not at home to test. I do remember I got best results with complimentary opposite colours ie deep blue and bright orange clips.

You can make clips in AE first with chromakey and making your black and white clip blue and green, replacing each colour with the desired clip, but it's not the same as live obviously.

[Edited on 15-4-2005 by continuity-B]