Re: Dry Time for UltraChrome inks/Calibration
Re: Dry Time for UltraChrome inks/Calibration
- Subject: Re: Dry Time for UltraChrome inks/Calibration
- From: Graeme Gill <email@hidden>
- Date: Wed, 05 Feb 2003 12:37:50 +1100
Ray Maxwell wrote:
>
combinations. Unfortunately, we cannot enclose diagrams on this forum.
>
Plot the following values and you will get some idea of what I am referring
>
to.
>
>
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)
>
>
I have not include all of the points, but I think you can get an idea of
>
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.
You are only viewing a projection of the color. What are the L* values ?
There is only a problem if the L*a*b* values fold back, meaning that
there is more than one device value that can produce a given L*a*b*.
The thing of primary concern is that there be a 1:1 mapping between
the PCS and the device values, and that there be continuity in
this mapping. A thing of secondary concern is how greatly the
relationship between device values and PCS changes (ie. degree
of non proportionality), which will affect how accurately the devices
behaviour can be modeled.
Graeme Gill.
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