Page 126 - Photoshop for Lightroom Users – Scott Kelby 2nd Edition

Once you click OK, it hides the original Background layer, and your selected subject appears on their own layer (as seen here), with a transparent
background (that gray-and-white checkerboard area represents the transparent areas. That’s how Photoshop displays transparency when the Background
layer is hidden from view). Now, if you look closely, there are a few areas that are kind of “dropping out” (areas that are semi-transparent, but shouldn’t
be), like near the edges of parts of the fur, and near the edges in the top parts of her coat, and even parts of her flyaway hair aren’t all that solid. This is
pretty typical, but we’re not done—the next step is going to be fixing all those areas in a jiffy.

Step Seven:
This is a trick I discovered years ago, and it has made a huge difference for me (and hopefully, for you, too, now). It’s just so darn easy: duplicate the layer
twice. That’s it—just make two duplicate layers by pressing Command-J (PC: Ctrl-J) twice. What this does is builds up the pixels on those edges, and it
fills those areas in beautifully. It fills in the hair edges, making them thicker, more noticeable, and fuller. It’s like Pantene Pro-V Conditioner for thick,
more lustrous hair (sorry—couldn’t help myself). Compare the edges and the flyaway hair in this image, with its duplicate layers, to the image in Step Six.
Big difference. Once that’s done, we don’t need all three layers any longer, so let’s merge them into a single layer. Press-and-hold the Command (PC: Ctrl)
key and click on all three layers in the Layers panel to select them (as seen here, bottom left). Now, press Command-E (PC: Ctrl-E) to merge them down
into one layer (as seen here, bottom right). Don’t worry—it keeps the build-up intact. Then, press Command-C (PC: Ctrl-C) to Copy this layer into
memory (because it’s already on a layer, you don’t need to Select All first).