Re: Humidity and Ultrachrome inks stability
Re: Humidity and Ultrachrome inks stability
- Subject: Re: Humidity and Ultrachrome inks stability
- From: Roger Breton <email@hidden>
- Date: Sat, 26 Mar 2005 20:44:21 -0500
I searched the archive for "Stability of Epson 4000 Proofing Device" and
found a post by Abhay Sharma, on the heels of its WMU study publication:
> Immediate repeatability of Epson Stylus Pro 4000 printer
> Two ECI 2002 targets were printed one after the other on roll paper 0.43
> (4.66)
> Long term repeatability of Epson Stylus Pro 4000 printer
> Two ECI 2002 targets were printed - 3 weeks apart 0.98 (5.01)
These results tell me that the variability I observed in my tests (0.25 dE,
max 2.03), using the same ECI2002 charts, was not so much a function of
environmental factors conditions, such as humidity or room temperature but
more likely a function of the design of Epson 4000 printing system itself,
for which I don't see how I could do anything about -- other than to
complain about it to Epson. I exhausted all the other possibilities and it
does not appear to be a problem of corrupted drivers or sick linearization
setup. I think its a consequence of either the heads not being able to fire
up more consistently certain mixture of inks or the result of uneven ink
chemical reactions taking place in the presence of high concentrations of
that ultrachome yellow, like I posted earlier.
Anyone else tested the repeatability of Epson Ultrachrome printers on this
List, other than Dr. Sharma and myself, and care to discuss their results,
here or offlist? I wonder whether this relative instability of the UC inks
only a feature of the 4000 printers themselves, or do the 7600s, 9600s,
10600s printers also suffer to some extent from this 'deficiency'?
[I now wonder whether the HPs are 'more repeatable' than the Epsons? Never
mind the ink technology]
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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