Re: Black generation questions for large format inkjet
Re: Black generation questions for large format inkjet
- Subject: Re: Black generation questions for large format inkjet
- From: Lorenzo Ridolfi <email@hidden>
- Date: Thu, 19 Apr 2007 23:39:11 -0300
Terry Wyse wrote:
I'm not quite sure I'm getting this. GMB is recommending you build a
chart with separation setttings that you'll use for the final
profile....without knowing what those optimum settings should be? I
could MAYBE see pre-determining the total ink limit for a chart
(that's fairly easy to determine before you profile) to avoid
over-inking but I don't see how one could know with any kind of
certainty what separation settings should be used prior to building
the profile.
Like Harold Boll eluded to, calibration/linearization steps should be
a key part of getting good device behavior prior to profiling.
Printing/measuring a profile testchart without any pre-determined
assumptions would be the way to go I would think, that way you have a
more complete set of data from which to determine final separation
settings. I'll generally build a half dozen or so profiles and analyze
each one of them to sort of find the "sweet spot" for total ink limit
and K generation.
Regards,
Terry Wyse
Hi Terry,
I decided to use the custom testchart with different separation settings
because the printer has a heavy "peppering" problem. Having this
problem, a different black generation in the testchart would result in
patches with a "noise pattern" very distinct that, IMHO, could result
in significant differences in the patch lab values. As I said in a
previous mail, I want to minimize the options I'll test to avoid
measuring a dozen different test charts manually with an eye-one. Based
on the feedback I received (thank you guys!), now I'm planning to print
and test 3 testcharts to deal with the peppering problem:
1) GCR1 with 100% black width
2) GCR1 with 50% black width
3) GCR2 with 0% black width
With the peppering problem solved, I believe (and hope!) the variations
in the having a different separation settings in the profile and in the
testchart will be strongly reduced. Now, I'll play with other black
generation settings, generate other profiles, print some test images and
after that, I'll generate another custom testchart with best settings
to build the final profile.
Best regards,
Lorenzo
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