gleech command-line utility & node package

Glitchy3bitDIther can now run as a node package or a stand-alone commandline app.

Convert Glitchy3bitDither to Node.js

v0.1.0 has added glitch functions to jimp, and mostly successfully emulates Glitchy3bitDither in node.js. There are still some kinks to work out in a few of the glitch functions, use at your own peril.