From: Larry Roohr (lrryr@home.com)
Date: 05/26/01-01:30:56 PM Z
>
> Larry, Can you elaborate on the problems with Zia negs and would someone
> also comment on how closely aligned the Zia making may be to producing
PT/PD
> prints.
Zia's require density's up to ~2 or greater and the step wedges I've printed
are very straight line. Inkjet material needs to hold a lot of ink to get to
that density, few materials can do this. Dan's method of using colors more
opaque to UV is one way to address this. When I printed step wedges on
Pictorico it exceeded the 2.0 density requirements by quite a bit, but at
the dense end a small increase in density in the (negative) digital image
made a huge step in density on the pictorico substrate. The curve I came up
with to deal with this was so steep there weren't enough samples with my 8
bit (at the time) scans and posterization resulted. I hope I'm remembering
this correctly, it was quite a while ago.
I've heard that Dan does beautiful work with this pictorico film, doing
exactly what I found so troublesome so I hope my lack of success doesnt get
in anyones way. I may just be missing something here and I havnt re-looked
at it since getting high-bit scan capability and the piezo drivers basicly
because I'm time-poor, lazy, and very happy with piezo printing in and of
itself.
Interesting discussion, looking forward to more.
Larry
This archive was generated by hypermail 2b30 : 07/12/01-11:29:40 AM Z CST