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Date: Tue, 12 Apr 2016 20:42:36 -0400
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From: DJ Delorie <dj AT delorie DOT com>
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Subject: Re: [geda-user] invert pcb output
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> What's a quick way to invert output for exposing photoresist?

Select the "ps-invert" option in the dialog.  There's also a "mirror"
option if you need it flipped over (the ink should be towards the
board for the best focus).

However, I use png export for masks as some postscript interpreters
make objects one pixel too big or too small due to edge condition
rules in PS.