See [README] for details.
Also check out these examples:
This is an example input image before noise has been added.
This is an example of the output with 20% chance of noise.
This is the same example with only 1% noise.
This image is in the public domain; taken from http://commons.wikimedia.org/wiki/File:A_Black_and_White_rectangular_Monochrome_Bitmap.JPG
It was a monochrome bitmap, but SF insists on jpg screenshots, so it was converted thus.