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: Mon, 3 Feb 2003 08:43:13 +0100
Damon Rando wrote:
<...I've found that the key in profiling UltraChrome based prints is proper
calibration (linearization). >
I don't think this is limited to or a special consideration with
Ultrachrome - rather the case with any inkjet printer.
<There is density reversal in all four inks
as is commonly found. Effective maximum density (just before density
reversal) occurs at about 75% (uncalibrated dot area) depending on ink
and media. There is a very significant saturation reversal and hue
shift at about 60% (depends on paper) for both magenta and cyan. It is
important to limit the ink before this reversal takes place. >
This is interesting - I was discussing this with Graeme Gill a month or two
ago here. Can you specify what you mean by density reversal? Have you done
density measurements with a Spectroeye or only a density meter?
<Not doing this makes prediction of secondary colors difficult for profiling
software. This can be seen in the Hex plot of a profile created without
significant cut back. This cut back also does not significantly effect
the gamut of the profile. The additional density doesn't contribute
significantly to color saturation.>
Very true. The reason I am particularly interested is that although it is
true that there apparently is not a large difference in color gammut when
cutting back - if you use the L slider in 2d view of the gammut in Profile
Editor, you will see a definite cutback in highly saturated colors which
affects the possibilities of spot color printing.
<This is not real easy to explain in a short paragraph. It is best
demonstrated with pictures. At some point I will post all of my
findings on a web page. I'll send you a separate email with screen
grabs of these 3D plots. I'm happy to send this to anyone on the list
that is interested.>
Please send. Thanks.
Regards.
Darrian Young
MGV
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