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In this movie, we are going to look at creating something called a track matte. Now we've looked at creating a matte, or a mask, earlier on in the last chapter when we talked about creating a green screen, where in we had footage with green screen, and we tried to use effects to remove that green. Well, you can also use or create a matte out of other things, as well. In this case, we are going to be using this video that you're seeing on screen right now. We are going to use the white in this movie. By the way, both of the clips in this video are from Artbeats, and we're going to be using the white in this Artbeat's clip as a mask to reveal the clip beneath it, which is this clip.
Now we have one more layer here. It's actually there is white clip, basically we get that by going to the dropdown menu in the Project panel here and then instead of choosing Black Video which is what we've done throughout this title, I created a Color Matte and then just chose a white color, which is basically the same as creating Black Video but it's white. So that's our background, and then we have this clip with the chaos and stuff, and then this clip that's going to be the mask, we are going to just leave that off. We don't need to see that. So what I'm going to do is I am going to apply the Track Matte Key effect to this CDA102 layer that you're actually seeing right now, on screen.
And that's because this is the layer that's actually going to have a matte applied to it. So the top layer is what we are using as the mask, and we are going to mask the bottom layer with the mask on top. So I'm going to open up the Track Matte Key effect and there is two options here. We can composite using Matte Alpha, which would actually use the transparency information in the top layer as a mask, or you can Matte Luma, the brightness, which is what we're going to do. So we choose Matte Luma, and then we matte using, ready for this, Video 3.
That looks amazing. So again, we're using the bright parts of this top layer as a mask and that's what's creating the mask on this chaos layer, and that's why it's black here because we're seeing the black chaos layer, and then there's a white background beneath it so we can see what's going on. So now as we play this, we get a very beautiful look. Now, a lot of this coolness comes from the fact that the Artbeat's clips are of such high quality, but nevertheless, the trick is awesome, being able to mask out parts of the layer using brightness or using transparency, all courtesy of the Track Matte Key effect.
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