gEDA-user: Outputting negative plane layers from pcb?

[Randall Nortman <geda-lists@wonderclown.org>]

The PCB fab house I intend to use requires that all ground and power
planes be printed in negative in the Gerber files.  (See
http://www.pcbfabexpress.com/faq.jsp#q10.)  They say that most CAD
software does this by default, but I don't see any mention of it in
the manual.  I can see that I can select "invert" when printing the
Gerber files, but I don't see any way to specify particular layers to
be inverted but not others.  I suppose I could print twice, once
inverted and once normal, and then just ship them the right file for
each layer, but this seems like a pain.  Is there an easier way?

Thanks in advance,

Randall Nortman