README.md

make these executable:
   chmod +x pcb.py
   chmod +x frep.py

execute:
   pcb.py | frep.py

view:
   out.png

optional arguments:
   pcb.py | frep.py dpi
   pcb.py | frep.py dpi filename

dependencies:
   Python
   NumPy
   Python Imaging Library

sample: