I've got a long function with two variables, encoding - I suspect - a hidden message. Most likely, the message is somehow encoded in the function's roots. Is there any good software to plot a function in two dimensions and only show the points where it evaluates to zero? [more inside]
posted by Triton on Aug 15, 2010 - 7 answers

How can I create hidden visual elements that can only be viewed under specific conditions? [more inside]
posted by howiamdifferent on Jul 7, 2010 - 10 answers

Waiter! Waiter! There are dots in my spam. Could it be stego? [more inside]
posted by blacksky on Aug 16, 2006 - 14 answers