i dunno what it's called, but that is what i would describe it as.
i saw an example in somebody's sig..

how do you do that? lol, it might be a really easy action, but i've only taught myself on photoshop, and can work relatively fast and accurately on it; but i don't know a lot about the more complex of tasks.
i can kind of fumble my way through this, but i can't make it equal at either side.
anyone show me how to do this?