So for that I'm going to select at the clip, grab the pen tool, and now I'm going to click to select that part. Now that the key is a little bit better, let's zoom out and add a mask around this part here on the young man's chest. Somewhere around yay, remember again, it depends on which color you chose and all of that, so each and every time you do this it's going to be a little bit differently, and I'm going to make it a little bit soft, maybe around 1.9 or so. The softness, and the screen shrink and grow, we're going to do that while looking at the final result, and, of course, zooming in, and yes, there's a little edge here around the shirt, and all of that, so I think I'm going to shrink this edge a little bit. Let's adjust now the screen matte, and for that we're going to change the value to a screen matte, and actually that's pretty good right there. Don't forget that there is a section here for foreground color correction, which we are going to be using, as well. I'll select his face again for the despill bias, and now for the alpha bias, I'm going to select somewhere around this green here, and that helps a little bit the tonality of the shirt, and the face, and all of that. As soon as we do that, we see that the shirt turns a little bit off, so maybe for this one, we want to not lock the biases together. We have not chosen any kind of despill here, so let's go ahead and choose the despill bias, and click on his face. Let's go ahead and finish this key a little bit better.
Now, we are going to fix that, and we do that with masks. Now, let's go ahead and change this view to a final result, and you can see that what was green here on his shirt also turned transparent. Select and go to effect, keylight, and select a matte, change this view to a status view, change the screen gain just a little bit, change the screen balance, only a tad, and if your colors don't look like mine, that is perfectly okay, it really depends on which screen color you chose.
Now, let's go ahead and apply keylight to the top clip.
Go ahead and open Composition 4.1 Inside Mask. If, however, we are using the mask to keep something from being affected by the key, this mask is called inside mask. When we need to narrow the part of the video that is green with a subject, those masks are known as garbage masks, or outside masks. We also use masks for when we want to keep something green, even though we are keying the green color. We use masks so that we can isolate the green color from other parts of the background.
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