Re: Printer Profiling Issues
Re: Printer Profiling Issues
- Subject: Re: Printer Profiling Issues
- From: Scott Martin via colorsync-users <email@hidden>
- Date: Tue, 25 Jun 2019 15:56:11 -0500
> Ink limits were set by visually inspecting the Onyx target.
Can we talk about how we optimize the pre-profiling calibration steps (ink
restrictions, linearization, and total ink limits)? RIPs often don’t provide
much help here because they don’t give us great tools or analyzing what’s
happening so that we can make an educated decision. For initial per channel ink
restrictions, some RIPs give us sliders as if to say “Just set them where you
want it” while others come up with a suggestion without telling us how they
came up with it. A lot of times people like us make an educated guess but are
left wondering “Was that the perfect setting? Could it have been better?” When
it comes to total ink limits we might test 300, 360 and 400 TIL, for example,
and see which looks best. But all are of these approaches appease “good enough”
but don’t represent "optimal". The optimal cyan ink restriction might be 76.71%
and the optimal TIL might be 342.2%. How do we get to that quickly and easily
and stop messing around with glorified guesswork?
I’d like to think we can take a data driven approach for scientifically
determining the optimal settings for each step in the calibration process. I’ve
been geeking out on this for a long time and have created a methodology for
this that works with any printing process through any RIP. I call it the
ChromaMax calibration methodology and you can read more if you like at
https://www.on-sight.com/chromamax/ <https://www.on-sight.com/chromamax/> I
also have some blog articles examining the different steps in some detail, like
this one:
CHROMAMAX PART 1: PRINTER INK RESTRICTIONS
https://www.on-sight.com/chromamax-printer-ink-restrictions/
Solvent is a funny beast. If the ink restrictions are too high you’ll have to
lower the total ink limits so far it will hurt print quality. If the ink
restrictions are too low you will hurt print quality even though you can set
the total ink limits really high. There is a see-saw effect here to manage so
that you can find that "sweet spot” for optimal over all image quality.
So ink restrictions are one part, linearization is another, total ink limiting
is another and the final profile is the last. If the three pre-profiling steps
are really done right (or what I like to call "optimally”), the final profile
won’t have to work as hard and you’ll achieve maximum color gamut, DMax, and
have excellent colorimetric color matching like it sounds like you’re looking
for.
So what I’m suggesting is all these steps are important, not just ink
restrictions.
Cheers
Scott Martin
www.on-sight.com <http://www.on-sight.com/>
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