On Wed, 10 Sep 1997 13:27:52 METDST, you wrote:

>Hi,
>Sorry, this is slightly off topic.
>I want to convert a pcb layout file which is in gerber format
>to PostScript to print on paper. Are there any ready made utilities, with
>the source code, in Public Domain available? What about GhostScript?
>BTW have you tried to make a layout mask using transparency, ink jet
>printer and photoresist, is the quality and contrast acceptable?
>I have tried using laser printer, but have found that the black areas were
>slightly transparent to UV, so the resulting pcb was practicaly unusable.
>I also had no lack using this special transparencies (TES or something else)
>which you iron press on a copper board.
>Thanks for comments,
>Janusz
The trick with Lasers is to use heavy tracing paper (90GSM or higher -
thin stuff crinkles too much). The toner sticks much better than on
acetate transparencies. It's also much cheaper! Very heavy drafting
film is also OK, but expensive and can distort when fused.
For all but the simplest PCBs you need to laserprint at 600DPI. 
I regularly do PCBs with 40 tracks per inch off a 600DPI laser with no
probs. 
Spray-on photoresist is useless outside a cleanroom - dust always gets
on the PCB before it dries. Use pre-coated board.