From the course: VFX Keying: Master Course

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Using garbage mattes to save time

Using garbage mattes to save time - Nuke Tutorial

From the course: VFX Keying: Master Course

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Using garbage mattes to save time

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- [Instructor] You must never adjust the keyer to clear out the noise in the backing region because that will lose edge detail and harden the edges all over the key. Instead, you adjust the keyer just enough to get the noise away from your key, then add a garbage matte to clear the backing region. Here's what I mean. Let's push in here to this example. Now in this case we're gonna be doing self matting where I'm gonna use the key that was created by keylight, the initial keyer, and use that key to create the garbage matte. So this is the noise in the backing region that I wanna clear out. So I just attached a grade node to the output of the keylight, let's open that guy up. We'll set it to talk to the alpha channel. Now to clear out this noise, I'm gonna raise the blackpoint until it's all gone, there. Now sometimes when you do that you can open up holes in your core matte. So if that happens, you wanna slide your viewer gamma down lookin' for any holes in your core matte. You then…

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