RE: Dry Time for UltraChrome inks/Calibration
RE: Dry Time for UltraChrome inks/Calibration
- Subject: RE: Dry Time for UltraChrome inks/Calibration
- From: "Darrian Young" <email@hidden>
- Date: Tue, 4 Feb 2003 16:44:21 +0100
Robin Myers wrote:
<Be careful here. Looking at increasing saturation on a*b* diagrams (what
you are incorrectly calling "spider plots") can lead to false
conclusions unless you understand some things about the L*a*b* space.>
I will let Ray Maxwell discuss the spider plots as they are his.
<These areas where color "hooks" around and "changes lightness" are
natural "features" of the L*a*b* color space. They may have nothing to
do whatsoever with the ink. This is one of the reasons that the L*a*b*
was never intended for color matching calculations. It was designed to
be used for representing color differences only. There are a number of
color science volumes that discuss this and I would invite you to check
the reference list on my website for them.>
I don't think lightness is the only problem here, at least from my
experience. I also have seen problems with color shift. There is is
something unclear here - if not limiting the ink correctly leads to
"hooking", while the "hooking" goes away or is less apparent when limited,
and the resulting profile works much better, what part does "the natural
features of L*a*b*" play. In my case, I am interested in getting good and
precise prints out of the printer. I also don't think that Mr. Maxwell was
saying a L*a*b analysis is everthing either - at least not the way I read it
<<I suggest that you look at a spider Lab plot and not just density when
setting ink limits>> I see this as look at density AND L*a*b. Are you
recommending then to only look at density? I don't think density was
intended for color matching calculations either (especially given that
density doesn't deal with color). Thank you for the refereneces to your
site - I will take a look.
Regards.
Darrian Young
MGV
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