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Keying is the process of cutting something out of its background using either a color value, know as Chroma Keying, or brightness, known as Luma Keying. Typically when someone shoots something that needs to be keyed they use either a blue or green screen. These colors have proven to be the easier colors to work with. If it's not already open, we are in the 01 Key Types projects. Hit F5 to open up your Project pane. And you'll notice in this example, I have shot my friend Jake here on a green screen. If you turn off the top layer, you can see what a Chroma Key typically looks like once it's actually been applied. Blue and green screen shoots are usually the best way to shoot something if you want to keep the subject looking photo-real.
The next example is a Luma Key. Let's see what that looks like. Turn off the green keyed layer and you'll notice I have this dancer on a background. Typically I use a Luma Key to create a stylistic look and not for photo-real shoots. If you turn off the Luma Keyed layer, let me show you what I'm talking about. Open up the Luma Keyed group and open up the Luma Keyed layer, and you'll notice I have two things applied here. So the first thing you want to do is key based on the Luminance.
So if you check that check box you'll notice I'm left with something that's not very photo-real looking. Well, like I said I'm just trying to create a stylistic look. So I applied a Tint Filter to it to change the majority of it black. And then I added a color background underneath so I could see exactly what it'd look like. Now obviously I used a blue rectangle but you could use whatever footage you want or whatever graphic you want. So as you can see with a Luminance Key, it's very easy to create a stylistic look on a background but it's not something you really want to go to for photo real things. In my honest opinion, Motion is okay for keying things. If you find yourself keying a lot of footage or doing a lot of detailed keys, one of the products you should be checking out is Shake, or at the very at least After Effects with the Keylight filter. So now that you know a little bit about the different types of keys, let's get started and actually pull a key using the Primatte RT Filter here in Motion.
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