We all seem to have that issue. Someone speculated it had to do with the default size of the picture. I think it's a 1.2 or 1.3 mega-pixel camera trying to take a 1536 x 2048 picture.

http://www.flickr.com/photos/8915337@N02/5625413159/
BTW - if theres a lot of light you get a pretty shade of violet.