Re: Hi-Fi inksets
Re: Hi-Fi inksets
- Subject: Re: Hi-Fi inksets
- From: Robert L Krawitz <email@hidden>
- Date: Thu, 5 Feb 2004 08:08:13 -0500
Date: Thu, 05 Feb 2004 19:42:16 +1100
From: Graeme Gill <email@hidden>
Robert L Krawitz wrote
>The 2200 can use the same minimum drop size (4 pl) at 720, 1440x720,
>and 2880x1440 DPI, which yields approximately the same highlight
>smoothness. I've found that at higher resolutions there's more
>placement error, which messes up the screen pattern a bit.
I can't say we've seen many occasions where a lower resolution
looks better than a properly setup higher resolution. I haven't
noticed any of our screens being "messed up" by a higher resolution
at all.
It does seem odd to me, and I need to investigate it further.
Just to follow up one of your earlier comments about screens that
operate across the colorplanes, I've certainly read the articles,
and looked at the pretty pictures, but given the difficulties that
real world printers (like inkjets) have in positioning their dots
accurately (they wouldn't have banding problems and need all the
elaborate cover ups for this in color separations, screening and
multi-pass printing if they positioned their pixels perfectly), I'm
not currently convinced that such screening methods are actually
useful outside the research lab.
Cross-plane screening helps most at very low densities (highlights).
The placement error is constant (it doesn't depend upon the density).
So if the placement deviation is on the order of .001", but the
separation between dots is 1/64" (which at 1440x720 DPI corresponds to
a density of about .4%, which is certainly quite visible), the
placement error is negligible compared to the average dot separation.
However, if you're screening two different colors of dots
independently, you might not wind up with such even separation, and
you'll get clumping.
At higher densities, of course, this won't matter too much, but the
placement error becomes significant. The result is that the problems
are different at different ink levels.
--
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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