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Typically in the process of keying, you can't always cut everything out of your shot, whether it's a microphone or just a dirty key. In this case our Luma Key work great, except for let's go ahead and select the Breakdancer here, these as you can see. And if I drag my playhead down here, you can right here we have a corner that couldn't quite get keyed out. So this is the perfect time to use a Simple Mask. I am just going to Undo, to move my footage back here in the center, and go up and select the Breakdancer and select our Mask tool.
Now since the problem areas are right here on the edges, I can just probably draw a circle and get this taken care of. So if you click and hold on your Mask tools, the second option down is the Circle Mask. And as always you have the Breakdance layer selected, when you go to draw your mask, it will automatically be applied to that specific layer. So when I let go, now look what happened. The corner is beautiful and the edges are perfect. If we go ahead and click back on the Breakdancer and drag that over to the sides, you'll notice everything looks wonderful.
And that's the basics of adding a Simple Mask. Now just because we have the Mask tools, it doesn't mean you can't use something else as a Mask. Let me show you, go and select the Circle Mask, and hit the Minus key, and what I want to do this time is actually draw a shape. So I will click on the Square here, draw that out. And I am just drawing the shape right over this guy. And now if you select your Breakdance layer, go up under Object and choose add Image Mask, or Shift+Cmd+M.
It will add an Image Mask on here. Now what this little thing is, is a droplet, you will notice if your HUD is up, F7, its asking well what would like as your Mask source. In this case since I drew a rectangle, I am going to use a Rectangle. Go ahead and just click and drag and drop that right into the well. I can drag it into my HUD, or I could drag it in right here, in my Layers Palette. Couldn't let go, if I select my Image Mask, now it's using the alpha channel created by this Rectangle, to cut out that very same mask.
So we have more than one way, of actually applying Simple Masks in Motion. One could be the Mask tool, the others could be literally any object in your project.
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