How to create a transition where a certain area stays the same?
For example, let's say I have 2 pictures of me. They're different, but my face expression is the same in both. I want to create a transition between them (cross dissolve or something) so that my face doesn't get blurred during that transition. Like, it's a different size than in the other photo, so I want it to kind of morph into the second one, without a sudden change in position.
MacBook Pro, OS X Mavericks (10.9.1)