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So far we've covered how to use effects to create a variety of interesting results. One of the most powerful ways to use effects is to stack them on top of one another, in what's called a composite. A composite is created by combining different effects that have an element of transparency so that you can vertically see through the various layers. Let's take a look at what we're talking about. First, I want to introduce you to this sequence. I've added a couple more effects. We start off black and white, and then we slowly go to color, and then I'd like to have some vertical compositing elements right in this area, and then we go back to black and white.
So right here I have two video clips stacked on top of one another. On V1, I have Kim and Dave just dancing in this medium shot, and on V2, I have a close-up of their feet. And the goal is to see the feet and them dancing in the medium shot simultaneously. So I've already stacked it for you. Now we just need to grab a vertical effect, or an effect with an element of transparency so that we can see through to V1.
So I'll just go to the Effect palette, and the Blend category is an excellent place to find some vertical effects. I'm just going to grab the Superimpose and drag it right on top of V2. Now right away, we see both clips, because the default value for a superimpose is 50%. And let's go ahead and look in the Effect Editor to see what this means. So we have a default value of our level being 50% uniformly throughout this segment.
What I'd like to do is actually start off fully opaque, come up to 50%, and then come back down. So I'm going to apply a keyframe here to begin, and we'd like to hold on our transparency in the middle, so I'll apply two keyframes like so, and one at the end. On the first keyframe-- activate my Effect palette here-- I want to see just the medium shot here, so let's go ahead and drag our level down to 0. And then I'd gradually like to come up to about 50%, or maybe a little bit less.
Let's go ahead and experiment here to see how we like it. Yeah, I'd like to have it right around 40%, 42%. There we go. So again, we're going to copy and paste our keyframe parameters. So I'm just going to click on keyframe 2, Ctrl+C or Command+C on a Mac. Ctrl+V or Command+V, and we want to go to the fourth keyframe, and we want to be fully opaque again.
So I'm going to go back down to 0. Let's just see how it looks by playing it in the Effect Preview monitor. (clip playing) Okay, it looks pretty good. I might change the position of a couple of these keyframes so that that lasts a little bit longer. So I'm going to go ahead and just grab this. I'm going to Alt+Drag or Option+Drag on a Mac so that we get to this transparency a little bit sooner, and I'll Alt+Drag over here so that it will last a little bit longer. Now I'm going to come back out to the sequence and play it in the context of its adjacent shots to see if we like it.
Go ahead and press play. (clip playing) All right, I think that's what we're going for. As you can see, the Superimpose effect allows you to see more than one video track at a time, and it's a great tool for juxtaposing like or unlike images to communicate a relationship or idea between images. In the next movies, we'll take a look at some more complex vertical effects, as well as combining more than two video layers to create a composite.
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