Smoothing out the edges of a jagged mask

…So here I am looking at my initial mask.…Problem is, if I go ahead and zoom in to 100% by pressing Ctrl+1 or Cmd+1 on a Mac.…And I might even zoom in a little further on this guy's hair and ear.…You can see that we have some very jagged transitions.…And that's because, for the most part, except for that hand painting that we…just did, all of the pixels inside this mask are either black or white.…What we need to do in this movie is smooth those transitions.…And we're also going to turn our silhouette into an independent layer.…

So, the first thing we're going to do is take this threshold…20 channel that I created in the previous movie and I'm going to…create a copy of it by dragging it and dropping it…onto the little Page icon at the bottom of the Channels panel.…It's very important that you're working inside this same panel…because after all, every alpha channel is a flat, layerless image.…With the copy selected, I'll go up to the Filter menu.…And this is a great way to smooth any alpha channel, incidentally.…