From the course: VFX Keying: Master Course

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Ultimatte: Overall workflow

Ultimatte: Overall workflow - Nuke Tutorial

From the course: VFX Keying: Master Course

Ultimatte: Overall workflow

- [Narrator] Okay, the CP input, that's your clean plate. GM, that's the garbage matte. And hidden over here is HM, which is your holdout matte. So how do we use the garbage matte? Well, looking at the original blue screen, we can see that blue screen doesn't cover some portions of the background. So we make a garbage matte that covers that part of the screen that we want to clean up. And then we hook that into the GM or garbage matte input of Ultimatte and voila, get a nice clean plate. The holdout matte here, let's see how that's used, let me move this up here to reveal that, okay. Let's take a look at the alpha channel of this gal here. And we can see that her shawl is extremely transparent. So let's say that we needed to do a holdout matte to seal that in. So we would draw the holdout matte with the Roto node, and then hook it up to the HM, holdout matte input of Ultimatte and boom. A nice solid matte. Of course, you're going to have to roto that for the whole shot, but…

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