.4 Delta E
.4 Delta E
- Subject: .4 Delta E
- From: "DuWayne" <email@hidden>
- Date: Thu, 19 Sep 2002 15:19:32 -0400
>
Graeme Gill. wrote.....
>
>How can you make such a broad claim "Epson's and Roland's only vary .4
>
delta E",
>
>and expect it to be believed ? Its just plain incorrect. Dye inks on
>
>the Epson change by well over .4 delta E over 24 hours, and there are
>
>dozens of different Epson models, and at least 3 different inksets.
>
>
It not my study its Heidelburg's. Its not device to device --- its a
single
>
large format printers hardware only (device drift) - not wacky ink over
time
>
issues, media coatings, etc..Heidelburg was just trying to point down
>
variables that they didn't have to fight or that didn't matter. They
>
acknowledged that there were lots of other issues - but a single printer
>
will fire ink the same way week after week - Those Epson heads work pretty
>
well.
>
>
Graeme Gill. wrote.....
>
>If you linearize to the device maximum (or don't linearize
>
>at all), then you will get the maximum gamut for that particular
>
>device, but it won't be stable, or repeatable from device to device.
>
>
I agree device to device, but "maximum gamut for that particular device,
but
>
it won't be stable". The hardware is hardware- Heidelburg's Study will
prove
>
it, Imagexperts Head/Print analysis setup will prove it. If a single
piece
>
hardware varies that much we are all wasting out time - because all the
rip
>
code -- profiling won't work.
>
>
Graeme Gill. wrote.....
>
>A calibration system that is too difficult to use
>
>is nearly as useless as no calibration system as all, because
>
>users simply won't use it.
>
>
Then why do you want to try to teach "joe 6pack" the way to linearize,
>
figure out TAC, Start stop black color theory etc.. When an ImagePrint
user
>
can print an RGB Target, scan it in and be print very well(about 20
>
minutes). Try profiling a lot of other rips out there - Its takes hours
and
>
you have to know what your doing. "Joe6pack" has a better chance of
picking
>
lottery numbers than figuring out TAC, Start & Stop black and "linearize
to
>
a fixed maximum density, or you can linearize to the maximum density of
the
>
particulardevice in question."
>
>
Graeme Gill. wrote.....
>
>Typical of a printer being run through an RGB mode, the gamut in the
>
>dark and dark saturated colors is severely (and unnecessarily) limited.
>
>You aren't getting anything like the full potential of this printer
>
>using this profile !
>
>
Ok, then why is there a larger gamut in ImagePrint's profiles than any one
>
else's profiles for the same device? Looks like ImagePrint is getting more
>
out of the device than any one else using RGB.
>
>
Graeme Gill. wrote.....
>
>For us, the 10600 was dead easy, and the Ultrachrome ink
>
>works very well. Haven't had to change a thing, apart from creating some
>
>new color profiles.
>
>
I'm not an Epson guy, I'm not an Imageprint programmer, and Gill has a lot
>
more knowledge and skill than me. But not having to change ink limits
>
density curves, blend points etc. in the rip between pigment & UltraChrome
>
inks - It's a little hard to believe but maybe. But why didn't a lot of
rips
>
have a 10600 driver in a few days - if it was a simple code change? I
would
>
also love to seen an Epson user switch to Ultrachrome in a 10000 and see
>
what happens. I'll leave this for the programmers to debate.
>
>
>
DuWayne Rocus
>
Omniscience, Inc
>
South Florida Roland Dealer
>
(954) 584-2949 (954) 316-4841 Fax
>
www.rolandmedia.com
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