Soojin,
   From what I was told, the image-setter films are the same as 35mm
negative.  They use a laser to expose them.  I have tried printing out on a
laser printer transparency, but the dark areas were not completely dark
(the toner dots did not overlap) so I would get a small amount of exposure
through them.  This does not happen with the image-setter film.
Glen

At 10:39 AM 10/23/2002, you wrote:
>Message: 8
>Date: Tue, 22 Oct 2002 10:28:37 -0700 (PDT)
>From: Soojin Oh 
>To: [email protected]
>Subject: [mems-talk] low resolution photomask printer
>Reply-To: [email protected]
>
>
>When making low resolution photomask by printing on
>transparency, do the printing companies use special
>printers? Also are the transparent films special kind?
>
>I am just wondering if I can print out my data myself
>on regular overhead project transparency using high
>dpi inkjet printer(such as Lexmark, or Epson). It
>seems like they use very fancy kind of
>printer(Heidelberg Quickmaster )in the company I use
>to send my file to. Thier charge is over $100.00 for
>one page print-out!
>
>-Soojin in North Carolina