./piet-assembler somefile.piet | pnmtopng > out.png
./piet-compiler somefile.script | piet-assembler | pnmtopng > out.png
See http://www.toothycat.net/wiki/wiki.pl?MoonShadow/Piet for further documentation and samples.
Kudos to Hugh Satow for many assorted tweaks and bugfixes.
For convenience, a fork of Marc Majcher's Piet interpreter is included.
./piet-assembler assembler-samples/fizzbuzz.piet | pnmtopng > fizzbuzz.png && interpreter/piet fizzbuzz.png
See http://www.majcher.com/code/piet/Piet-Interpreter.html for documentation and updates.
License: Creative Commons Attribution-ShareAlike 4.0, http://creativecommons.org/licenses/by-sa/4.0/
As attribution, please link back to this github repo, https://github.com/sl236/Piet