Anamorph (2007)

Genre: Thriller
Starring: Willem Dafoe, Scott Speedman, Peter Stormare, and Clea DuVall
Tagline: Madness. Mayhem. Mutilation. The masterwork of a serial killer.
Plot: A psychological thriller based on the concept of anamorphosis, a painting technique that manipulates the laws of perspective to create two competing images on a single canvas.

http://www.imdb.com/title/tt0497323/
http://en.wikipedia.org/wiki/Anamorph_(film)