Creating a garbage mask

Whether you create a garbage mask at the beginning of the process or after the…process of keying is really up to you.…I personally like to get everything cut out of the scene that I'm not dealing…with so I know exactly what's left to use for my key.…If you're unfamiliar with the term garbage mask, all it is the process of…creating a mask to cut out any extemporaneous elements that you don't want in your scene.…So if we look at our video clip here, let's select Layer 1 and turn…the visibility off.…

You can see I have a graphic background that I want my talent over and I have…two shades of green.…This is basically the edge of the stage.…Now if we scroll out, you can see there's a slight black line all the way…around this as well.…So we're going to create a mask that just goes around her making sure to cut…this element out and this black line out. All right,…so let's scroll back up here and I'm actually going to choose Fit up to 100%…just so I can see all of the edges of my comp. Okay,…now if you go up to the Tool panel, let's click and hold, we can just choose…