Re: Dry Time for UltraChrome inks/Calibration
Re: Dry Time for UltraChrome inks/Calibration
- Subject: Re: Dry Time for UltraChrome inks/Calibration
- From: Robin Myers <email@hidden>
- Date: Tue, 04 Feb 2003 07:20:33 -0800
Darrian Young wrote:
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Ray Maxwell wrote:
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<Setting ink limits above this point does not increase the
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gamut and gives your profiling package allot of trouble.
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I suggest that you look at a spider Lab plot and not just density when
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setting ink limits.>
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Would you mind repeating this again (and again and again :-)) in boldfaced
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capital letters!? Why many if not most inkjet RIP manufacturers keep
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insisting on doing system setup based only on density is beyond me. Without
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even going into spider plots, etc. one only needs to look at a colored print
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to realize that they are not dealing with greyscale films from an
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imagesetter, and hence have more variables to control than simply density.
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.
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.
Robin Myers
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