1. A method of decoding a graphical bar code corresponding to an original base image modulated with a graphical encoding of an original message, comprising: measuring one or more intrinsic features of the graphical bar code; based upon the intrinsic feature measurements, selecting a sequence of graphical templates from a predefined template set of information-encoding graphical templates; and graphically demodulating the graphical bar code with the selected sequence of graphical templates to produce a message.