I came across this video on YouTube about the creation and production of Paperman. If you have not seen Paperman, I definitely recommend you check it out. It's a simple love story about two busy city-goers who experience that magical "love-at-first-sight" feeling, with a piece of paper being used to connect them.
What I found interesting is how the creators of Paperman combined old and modern techniques of animation. It is said in the beginning of the video that there is nothing like hand drawn animation. Hand drawn characters have a certain details that are hard to put into words. The hand drawn story can tell such great emotion with such simplicity that director John Kahrs admires so much. He wanted to get those drawings on top of the CG. He wanted to keep the beautiful hand drawn sketches. So, that's exactly what they did. Paperman started as sketches of hand-drawn figures, just like some of the earliest classical Disney movies.
But what was so lovely and unique is how they took these hand-sketched characters and brought them to life with more modern day animating software and techniques. They put these drawings into programs and played with the rigging, shading, modeling, vector renderings, and much more to really bring these animated characters to life.
I really recommend that you take a look at this video. It goes through some of the really cool software and program effects that helped create the characters to look a certain way. Who would have thought that even with all of the technology we have, Paperman started out on paper....