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 14:59:12 -0800
Ray Maxwell wrote:
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Please give us the URL of your website. I am interested in seeing it.
www.rmimaging.com
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Plot the following values and you will get some idea of what I am referring
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to.
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a* b*
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0.58, -3.80 (white point of the paper)
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-29.96, -43.72
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-32.49, -51.91
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-30.97, -57.03
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-19.67, -61.42
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-12.85, -62.01 (100% Cyan)
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I have not include all of the points, but I think you can get an idea of
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what I mean by hook. This cyan ink and paper combination actually folds
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back on itself. I am suggesting that you set the ink limit for this ink
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somewhere near the maximum C* point.
The blue region of L*a*b* space is one of the areas most notorious for
the "hooks" that result from the L*a*b* encoding, so I will not try to
evaluate your numbers based on a*b* values. It would be more interesting
to view the xy diagram AND the measured TRC. If you are saying that a
maximal saturation point is reached where increasing amounts of ink do
not add significantly to the color result, then this will show in the
TRC and limiting might be helpful.
Robin Myers
www.rmimaging.com
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