The Sprott Decoder (source)
takes as an argument a Sprott code from J. Clint Sprott's book
Creating Patterns in Chaos as argument
and produces a grayscale netpbm image. Compiling is pretty simple.
"gcc -lm syzygy.c -o syzygy" should work on most systems
A sample run is exhibited here
New: version can process quartic and quintic transformations.