My son wants to build a board to learn how it's done. We've got schematic and 
PCB files ready to roll. I've got some old Kepro-clad kits (pre-sensitized 
copperclad); now all we need is a way to get the artwork onto a negative. I've 
done it before using viewgraph transparencies, but don't now have a handy way 
to turn the printout into a negative. I recall doing it eons ago by using 
Postscript output to a file, then directly monkeying with the Postscript header to 
invert the colors. Does anybody have a more modern way to invert black and 
white? I can print to a PDF, but that doesn't seem helpful. Neither was anything 
I could find in tinkering with the colors within Protel. Surely somebody else 
out there has already done this? Thanks in advance for any help you can offer.

Steve Hednrix


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