The Art of De-Touch

From their website:

The Art of De-Touch explores the manipulation of images related to the human form. Drawing photographs from existing online portfolio sites of professional re-touch artists, this application allows a user to explore precisely how the images were altered. Using Processing, an open source programming language and environment, before and after images are compared algorithmically pixel by pixel to generate visualizations of the alterations.

It's a lot more fun than it sounds. Give it a try, and feel better about yourself knowing that nobody really looks the way they do in magazines.