Re: RIP's for Photographers
Re: RIP's for Photographers
- Subject: Re: RIP's for Photographers
- From: Robert L Krawitz <email@hidden>
- Date: Thu, 16 Oct 2003 07:41:43 -0400
From: "Ernst Dinkla" <email@hidden>
Date: Thu, 16 Oct 2003 11:54:39 +0200
If there's a problem it could be in the phasing of droplet sizes
along the densities. That issue is revealed in the QuadToneRIP of
Roy Harrington (Gimp-print based) with the Epson 2200 where shifts
in that phasing did cure banding effectivily (but could be printer
dependent :-( .
What shift in what phasing?
On the Epson wide Format list is one report where Onyx seems to
have done something wrong in the driver according to the Epson
10000 user, Epson and Onyx. More RIP users complain however. With a
few exceptions there is no better dithering etc done by other RIPs
than is done with the Epson driver. One thing is sure, any progress
in the manufacturer's knowledge on that subject is never translated
to the older supported printer models. Gimp-print shows that it is
possible to make things better for older printers too.
One issue that I've seen with the Epson driver is that it simply
doesn't print anything in the highlights, at least in some situations.
I printed the test page on a C84 in a store yesterday, and the
highlights were completely blown out. Granted, this was "text and
image" mode; I don't know what it does in photograph mode, and on
really good printers. However, it's generally harder to achieve good
dithering in areas of very little ink. We haven't found an entirely
satisfactory answer. Ordered dithering works quite well in areas of
extremely low density, but that comes at a cost in the midtones. Even
Tone dithering works quite well in midtones and highlights, but it
shows some error diffusion artifacts in extreme highlights.
--
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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