From the course: VFX Keying: Master Course

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Adding edge detail with an additive keyer

Adding edge detail with an additive keyer - Nuke Tutorial

From the course: VFX Keying: Master Course

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Adding edge detail with an additive keyer

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- [Narrator] The additive keyer is not actually a keyer. It blends the green-screen or blue-screen with the background, providing great edge detail. Then the foreground is comped over this blended background. There are many formulations for the additive keyer so here I'll demonstrate one popular one. Let's take a look at what the basic idea is here. The idea is to blend the green-screen with the background, like this. That's the additive keyer. Then we comp the foreground on top of that, picking up all the extra-edge detail that the additive keyer provided. Let's go back and take a look at how it works. Here's our set-up. I've got my original green-screen, of course. Did our de-noise, and this is the the green-screen that we're going to feed to the additive keyer. Then we do our spill-suppression. Here I've already got a key. So how you do your spill, how you create your keys, not important. Then we do the premult. So now we have the prepped foreground which is de-spilled, has a key…

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