Homebrew PCBs

I am trying to get more information on using photographic techniques
for making PCB's. For me I am at the limit of what I can really do
with toner transfer and my 1200dpi printer. I am trying to find
information about printing to transparency and then using some kind of
image reduction.
From what I can tell it looks like I would use a photographic
enlarger. I saw a few hints searching google that this could be used
for image reduction, but no real solid information.
Does anyone have suggestions on where I could look for more
information on this technique.