Re: Epson Ultrachrome Cyan ink problems
Re: Epson Ultrachrome Cyan ink problems
- Subject: Re: Epson Ultrachrome Cyan ink problems
- From: Martin Orpen <email@hidden>
- Date: Thu, 26 Jun 2008 13:07:22 +0100
On 25 Jun 2008, at 15:31, Rolf Gierling wrote:
Hello Martin,
That's a different ink set the one we use on the 9600.
Might not be related too, but Epson likes shuffling
the ink cartridges numbers.
I think I've worked out what's going on here.
Firstly, does anybody know how to get the Epson 9600 to print out
patches of 100% of each primary from the control panel on the printer?
I couldn't find any way so had to do something less scientific and get
two 9600s to do the first two stages of the EFi base linearization
routine.
One 9600 is using the new suspect Cyan, the other a Cyan that was
purchased a couple of years back. Both machines were set to 230%
maximum ink weight and the first set of ink density patches were run
and read in. Both then set themselves automatically to a 225% maximum
ink weight.
I then ran and measured the stage 2 individual ink density patches and
this is what I found:
1. The maximum Yellow and Magenta patches were within 3.5 dE of each
other when measured with an i1.
2. The maximum Cyan patches showed a difference of 25 dE with the
newer ink visibly much, much darker.
3. The 5th Cyan density patch of the new ink was less than 3 dE from
the 1st Cyan patch of the older ink.
Using a magnifier the stippled pattern of the patches looked identical
apart from the newer cyan appearing much darker.
This makes me think that the last two cartridges contain cyan that is
darker than it should be and -- as the overall hue appears to be the
same -- this situation can probably be fixed by relinearizing and
lowering the cyan ink limit.
Annoyingly, when you've got 10 different simulation queues all
requiring an iterative calibration routine, this represents many hours
of wasted time and materials just because Epson appear to have lost
quality control on these Cyan batches :-(
Hopefully this post will help others avoid similar waste if they start
noticing cyan problems.
--
Martin Orpen
Idea Digital Imaging Ltd
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