Digital BW, The Print

Jon-

A belated thanks for your reply. You've given me much food for thought, 
and I appreciate your time.

Bill Kennedy

-----Original Message-----
From: Jon Cone <piezobw@...>
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Sent: Sat, 08 Oct 2005 00:50:04 -0000
Subject: [Digital BW] Re: question about CFS systems - K7? Answers for 
Clayton

   Bill,

answers below:


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, BKPhoto@a... wrote:
>
> Jon-
>
> Thanks for the clarification on the ink formulation; it fills in
> another blank for me. It would be very helpful if you would elaborate
> on the relationship between the print profiles you're authoring for
> K7/QTR and the linearization issue. If I've understood you correctly:
> you're saying that the authoring process reduces the need to 
linearize.
> It would make sense to me if the machines we're using stayed in a
> factory calibrated state, or were self-calibrating. My experience is
> that machines do drift as they are used and there are other
> factors--ink stock and paper stock, even environmental issues--that
> affect the calibrated state of a printing system.
>
> Any insight you can provide would be very useful. I'm not asking for
> proprietary information, just a better understanding of the
> relationship between these issues and how you've addressed them.


Another way of saying it is there may be less to gain with linearizing 
a printer
and creating
simple curves - then to accept the state of the printer but use an 
elaborate
profile which
has many overlapping layers of ink to hide any potential flaws in the
linearization.

Its not just linearization, although linearization is important. In 
this case
its also the
quality of the profile.  In our free curve files for QTR there is a 
generic
linearization in
combination with an exceptional profile. The linearization is averaged 
over
three different
2200 printers (we think that is important rather than using a single 
example).
But the
elaborate ink curves if you could see them would boggle you. You 
couldn't make
that by
hand or with an instrument using the QTR curves generator. That is what 
makes
the
difference.



> There is one additional question you might address: the dmax of the 
K7
> inks. Is it possible to increase the dmax, or are there inherent
> limitations or other factors that impose a limit?



Well if its TRULY pure pigment there is a limit. We chose to go pure 
pigment on
the K7 set.
Adding even a trace of dye increases dMax. But we're not doing it in 
this set.
We found
that we could get greater dMax via QTR than the EPSON driver, or even 
our old
plugin. So
we decided not to compromise longevity with even a trace amount of dye.

regards,

Jon






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