There is software that does just this. If you have access to a Mac, a program named MetaSynth uses 2D pictures and Fourier transforms to synthesise audio. I suspect that RDJ used this.
http://faculty.washington.edu/dillon/PhonResources/javoice/vowjavoice2.html .
Javascript utility for converting images into sound. Developed in researching sight for the blind.
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http://the-fix.org
Sat May 11 16:10:59 2002
Damn, I was gonna try this, but RDJ beat me too it by the looks of it. I just had to work out a way to draw pictures using whitenoise and filters...