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 12:37:21 +1100
Darrian Young wrote:
>
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.
Most systems don't use density for colorimetric characterization,
they use it for system calibration.
Characterization generally takes effort (ie. lots of test patches
to read, lots of number crunching to do), whereas per device channel
calibration is quick (test wedge per channel, the maths takes
milliseconds).
Combined appropriately, the result is a system with good
colorimetric accuracy, and a practical means of compensating
for minor day to day device behaviour changes.
Yes, non-monotonic behaviour at gamut extremes can cause problems during
both characterization and calibration. Well designed systems generally
cope with this by stopping short of the non-monotonic regions.
Note that a device that displays non-monotonicity in an essential color
region is fundamentally unsuited for use as a color reproduction device.
Graeme Gill.
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