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Re: aguatint screens and photogravure screens
At 11:40 AM 8/11/01 -0700, you wrote:
>I just got the PRINTMAKING IN THE SUN book. I want to try photgravure. are
>aguatint screens and photogravure screens the same thing?
>Can such a screen be copied using lith film in a contact frame?
A tint screen can be copied with careful exposure and development on good
lith film but if the gravure screen is what you use for making halftones
then no to that one. That kind of screen is made with a continuous tone dot
that is greyed from high density in the center to no density between them
that results in different sized dots on the litho film according to the
lightness or darkness of the tone that is being projected onto it. I work
with photolithography on a daily basis so you should check the details on
that gravure screen to find out exactly what it is.
The tint screen can be copied because it has what is called a hard dot,
definite edges that can be reliably reproduced. The halftone screen has a
very soft dot with no definite edge to it, which enables it to be used in
the manner described. They are very hard to duplicate even with continuous