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: Terry Wyse <email@hidden>
- Date: Thu, 19 Apr 2007 21:46:12 -0400
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
On Apr 19, 2007, at 9:00 PM, Lorenzo Ridolfi wrote:
Hi Harold,
email@hidden wrote:
So with respect to your inkjet printer, you should calibrate the
device
first, but no Profile should be used in generating the testchart
data. To
do so obfuscates the innate system response. As pointed out
earlier, a
single valid characterization data set serves to generate many
Profiles
which differ in UI parameter settings.
I'm not using a profile to generate the testchart. The PM
Measuretool custom testchart function has an option to adjust the
separations for the testchart generation. GMB recommends to use the
same separation settings during the chart generation and during the
profile building to have "slight better results".
My recommendation for ProfileMaker settings would be as follows:
Max Black = 100%
Black Start = 30%
TAC = 360
K-curve shape = medium GCR
BlackWidth = 0 <minimal amount of K off neutral axis>
Thank you, I'll try it.
For the same set of separation settings, PM5 profiles typically
generate
less Black than say Monaco or other profile gen applications. The
above mix
of parameters ensures that you maintain a maximum dynamic range on
neutral
while minimizing the amount of K injected off-axis. You may want
to try a
range of BlackWidth settings – your concern about squeezing the
color-life
out of yellows strike me as being quite valid.
Ok. Thank you again.
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