Re: Inkjet Ink restrictions
Re: Inkjet Ink restrictions
- Subject: Re: Inkjet Ink restrictions
- From: "john castronovo" <email@hidden>
- Date: Mon, 02 Jun 2008 23:16:41 -0400
Agreed, but to be fair, it's much easier to profile RGB devices where
every color can only be made by using a single recipe. CMYK devices have
a much more complicated and fickle model and the new inkjets using seven
channels are proving to be extremely difficult to profile.
----- Original Message -----
From: "Mark Rice"
Unfortunately, I see a strange split in the inkjet world. Almost no
manufacturers make RIPs - it is left to 3rd party RIP manufacturers.
So I
doubt that HP is going to convince Onyx to give something up. The RIP
manufacturers, strangely, seem to have no interest in resolving this
"art"
of creating initial ink restrictions as the base for creating a
profile.
It's all done by eyeball, with predictably unpredictable results.
I would like to see a method of generating initial ink restrictions
based on
density values and some form of gray balance throughout the
linearization
range. This would be somewhat difficult, as different materials have
different ink absorption and drying characteristics. But some research
by
those REALLY SMART GUYS could figure out an algorithm, I believe.
In the photographic world of the Lambda and Lightjet, Fuji and Kodak
publish
aim point densities for their different photographic materials. There
are
specified photographic density aim points for every step on the scale.
The
RIP then does the best job it can to achieve these target densities.
This
has several added benefits:
1. It means that ICC profiles generated on one machine will work on
another
machine.
2. It means that one can re-linearize without changing the target
densities,
thus eliminating the need to re-characterize.
3. It means that nearly all machines in the world are calibrated to a
nearly
identical standard, and can print the same image nearly identically. A
linearization on an inkjet machine will typically create green-cyan
shadows,
and magenta highlights. A linearization on a Lambda will create a
nearly
perfect gray scale throughout the range!
4. It means that if you have 3 Lambdas or Lighjets in your working
environment, one can be substituted for the other with nearly no color
change.
Those four points seem to be a big workflow incentive! Now how can we
get
RIP makers to work on it?
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