image prospective tutorial?

[MudRover]

I'm trying to find a tutorial I once saw of a guy holding a sign, and a image was layered on top of the sign and the image changed prospective as the sign moved as if were really on the sign.

Does any one know of this tutorial?

I hope that made sense.

 

[MudRover]

Opps nevermind, it's an After Effects thing...

Here's the link I was thinking of:

http://www.adobe.com/tips/aft65cornerpin/main.html

..