Auto-segment a PCB design. It basically grows PCB traces to fill maximum space possible, respecting trace boundaries. Thus u'll only have to etch lines separating the traces. This saves a lot of time if u are etching manually (e.g. using rotary tool), or PCB milling. Saves wasted copper as well if u etch with chemicals. Can combine use with "cad.py". Do bitmap trace of output image with Inkscape to modify etch lines (thicker, etc.). I suggest scaling up PCB images at least 3x before using it with this sketch. Refer: "http://processing.org/learning/pixels/" for how to use this sketch. Enjoy!