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Now, one of the simplest ways to help isolate an object from its background is to actually just use a mask. Now, if we look at our project right here, you can see that I've got my green screen keyed really well. But if you look to the right side of the image, you can see the edge of that green screen itself is showing in the frame. So, what we need to do is just create a simple garbage mask for our scene. Now, this is going to be a relatively easy process because our shot is relatively static. If the person were moving around the scene, we would need to actually add key frames to the mask and have them follow the movement.
But let's start just by adding a garbage mask. I'm going to select layer one, and just grab my Rectangle tool. And just click and draw a mask, starting from off the edge of your Comp panel down to the lower right corner. And now, I have gotten rid of that extra area. We can end right there, but I want to show you another common practice because a lot of times, you don't necessarily want each individual effect to be applied to gain a clean key. So, to show you what I mean, if we go to our Effect Controls Panel in here, we have our Keylight effect, our Key Cleaner, and our Advanced Spill Suppressor.
Well, since our model has nice smooth arms here and the hair isn't as smooth, sometimes what you want to do is just have the Key Cleaner only be applied up in the hair region and not necessarily around the other regions of the body because all you really want is just the Key Cleaner up around the hair area. So, let's go ahead and isolate the Key Cleaner just using a secondary mask. So I'm going to go ahead and click and hold on my Shape tools to grab my Ellipse tool.
And I'll draw an ellipse around our model's hair area here. So I want to make sure to get her shoulders in there as well, but just the area here where her hair is kind of sticking out around the edge of her dress. And let me go ahead and just zoom up to 100% so you can see that. Okay now, just because I'm a stickler for this kind of thing, with my mask, I'm going to open up my Mask options here and just feather the edges of that mask because if there is a transition from inside to the outside of the mask, I want it to be soft as possible.
So now, let's go ahead in the timeline and collapse our Mask Options and open up our Effect Options. In here under the Key Cleaner effect, I only want the Key Cleaner effect to be applied to her hair, not down around here. So, what we'll do is open the options for the Key Cleaner and here you'll see I have Compositing Options. So, go ahead and click the plus button. It's going to automatically choose Mask 1, but go ahead and scroll up in this panel, and I am going to go ahead and click and choose Mask 2. Now it's using my inside mask, and if I wanted to make things more clear, I can open up my masks here and just select Mask 2 and press Return, and we'll rename this Cleaner Mask.
Okay, so that way, I can now see exactly which mask I'm masking off there. So now, the Key Cleaner has only been applied up in her hair area and it has not been applied anywhere else in the image. It's as simple as that. All you have to do is go to the Compositing Option and choose that proper mask. So now you can see with having the ability to apply a mask directly to an effect within a group of effects, you have a lot more control over how you process the keying process. So in addition to just cleaning up keys with masks, creating a simple garbage mask, you can definitely clean up your keys by applying the Key Cleaner just within specific areas.
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