Re: RIP's for Photographers
Re: RIP's for Photographers
- Subject: Re: RIP's for Photographers
- From: Robert L Krawitz <email@hidden>
- Date: Tue, 14 Oct 2003 18:49:24 -0400
From: "Ernst Dinkla" <email@hidden>
Date: Tue, 14 Oct 2003 17:31:19 +0200
Given the fact that several RIPs have problems to get the dithering
good (banding) at the highest resolution of the latest Epsons I
don't see the disadvantage of the Epson screening either. Not to
mention that Scanvec Amiable still hasn't a good driver for the
7600/9600, one that includes the grey ink. That there's a relation
between using Epson dithering and less transparent colour control
is another matter. Gimp-print's dithering is alright so what is
actually the reason that RIPs show problems there ? Good
dithering/weaving takes time in RIP development and later on in
actual printing, that could be a good reason.
Good dithering and weaving is simply not an easy problem. We
(Gimp-Print) have been working on it for about 4 years. Usually (so
I'm told) the firmware weaving modes are used on the Stylus Pro
printers and softweave on the others.
Banding and dithering are, to a first approximation, independent.
Banding is due to inhomogeneities in the print head (uneven spacing
between nozzles or uneven size). However, it's possible to do a
dither algorithm that takes the banding into account, although we
don't do that.
I don't understand why it should be so hard to use the gray ink,
though. I obviously don't know the internals of the Scanvec package,
but it shouldn't be too hard to do that. Tuning it optimally is
another matter, but just using it shouldn't be hard.
--
Robert Krawitz <email@hidden>
Tall Clubs International --
http://www.tall.org/ or 1-888-IM-TALL-2
Member of the League for Programming Freedom -- mail email@hidden
Project lead for Gimp Print --
http://gimp-print.sourceforge.net
"Linux doesn't dictate how I work, I dictate how Linux works."
--Eric Crampton
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