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The final result is a composition that shows a cat’s head “transplanted” onto a man’s
body!
Changing Layer Order - or What’s in Front?
The order that layers appear in the Layers tray is important. When you add a layer, it just
gets added to the top of the layers list. A layer that’s at the top is displayed "on top" or in
front of everything below it in the list.
Imagine again that each layer of your composition is drawn on a piece of clear plastic or
film. As you lay each piece of “film” in place, you build a composition. When you get a
few layers in place, to move one layer in front or behind another layer, drag it up or down
in the list.
Creating a layer cutout.
For a more precise cutout effect, advanced users can drag an image
with an Alpha channel into a composition, then use the
Transparency brushes to adjust what is displayed—without
affecting the Alpha information.