GIMP-style "Photocopy" effect [SOLVED FOR ME]

[el_supremo]

Have you tried a diffuser in front of the flash so that you get more even lighting? I have sometimes held a piece of crumpled Saran Wrap in front of the flash as a diffuser - cheap and fairly effective.
Some tinfoil arranged vertically around the edges of the board to act as a reflector might help too. If it works you wouldn't need to compensate for the uneven lighting.

Pete