From the course: Nuke New Features Consolidated

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Utlimatte: Refining the key

Utlimatte: Refining the key - Nuke Tutorial

From the course: Nuke New Features Consolidated

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Utlimatte: Refining the key

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- [Instructor] 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 the 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 viola. You get a nice, clean plate. The holdout matte here, let's see how that's used. I'll move this up here to reveal that, okay. Let's take a look at the alpha channel. This gal here, we can see that her shawl is extremely transparent, so let's say that we needed to do a holdout matte to fill 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 Ultimate, and boom, a nice, solid matte. Of course you're going to have to Roto that for the whole shot. But never the…

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