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Hi, John.
Before anything, if in Keylight you change the view menu from "Final Result" to "Screen Matte", you'll see a grayscale representation of your matte. In other words, black areas represent full trasparency, white fully opaque areas, and shades of gray, everything else (semi-transparency).
You will probably see there are some gray spots in your forgeground. These are areas of semi-transparency. You need to get rid of these spots, trying to not kill semi-transparency in other areas, or you'll get a really harsh key.
I would first raise a bit the Screen Gain Parameter. Don't go higher than, say, 110. As a general rule, if you have to move a slider too much, it's because you would have to do something else instead
So, after that go to the Screen Matte section of Keylight and you'll see controls like "Clip black" and "Clip white". These are analogous to input black and input white in Levels - they force almost transparent areas to become fully transparent, and near opaque areas to become fully opaque. This should to the trick. Again, don't push it too much or you'll loose semi-transparency in hair areas, etc.
Let me know if this worked.
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John:
Don't worry, you're not an idiot.
This is a craft that takes time to master.
Using green clothes when doing green screen work is a big, big NO. Make sure you write that down
Now, the problem is - the best way to mask something so it matches the shape of a keyed object is use the matte from the key as a mask... As you can probably anticipate, the problem is... the holes in the matte will also go through.
But don't worry. Here's something that should work.
Pre-compose the keyed layer (you can duplicate before Pre-Composing if you don't want to compromise the original).
You are only pre-composing it because some effects that will take the key as source wouldn't see the key but the original unkeyed footage as result if it wasn't in a Pre-comp. This pre-comp can be turned off. You don't need to see it. The effects need to see it
Apply the Set Matte effect in the solid. Make sure it points to the Pre-Comp in the "Take Matte from" menu, and uses Alpha Channel in the "Use for Matte" menu. This will mask the solid with the key. Then apply either the Simple Choker or Matte Choker effect (Effects > Matte) to the solid, and tweak the choke so that it closes the holes. This will give you a solid that is roughly masked like the keyed layer (the matte choking may erode the edges but nobody will see them anyway).
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