[stephengillie]

Neat project! This got me thinking - Why are QR codes black and white? Couldn't they transmit more information if they used colors?

[raylu]

Different cameras and software will do different kinds of automatic white balance correction but nobody will screw it up so bad that you can't differentiate black from white.

[philsnow]

Well, there are various color-based schemes like

http://en.wikipedia.org/wiki/High_Capacity_Color_Barcode