Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, DJ Delorie <dj@...> wrote:
>
> 
> "leon Heller" <leon355@...> writes:
> > DJ reckons they are about the same. I have to use the more expensive
> > JetStar Premium with my HP 5940, the ordinary stuff was OK with the
> > Epson printer I used to use.
> 
> IIRC the difference is that premium supports both ink and pigment, the
> other only supports one.  My printer happens to be the type that they
> both support, so I see no difference.
>
OK I've ordered some Silkjet media and I'm ready to try this, but I
may have gotten ahead of myself. It seems all the PCB editors 
output positive prints. How are you getting a negative print to be
able to use a negative process resist? Is there a way of doing this 
with a gerber file? Hidden options for printing? turning the printer 
upside down ;)?