Re: Dry Time for UltraChrome inks/Calibration
Re: Dry Time for UltraChrome inks/Calibration
- Subject: Re: Dry Time for UltraChrome inks/Calibration
- From: Damon Rando <email@hidden>
- Date: Sun, 2 Feb 2003 13:25:08 -0500
Gary,
I'll confirm Bruce's recommendation on Dry Time. This is the same
procedure I follow. This is a safe rule of thumb although the majority
of color shift takes place in the first 1 to 2 hours with UltraChrome
inks (depending on paper).
The bigger issue to deal with is the hue and saturation shift of the
UltraChrome inks through its density range. It seems that some
profiling software doesn't handle this real well. I achieved very good
results with Monaco. I've seen acceptable results with other software
(ProfileMaker) but wasn't able to achieve this. My profile went from
unacceptable to nailing a great profile with Monaco.
I've found that the key in profiling UltraChrome based prints is proper
calibration (linearization). 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. 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.
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.
Regards,
Damon
Damon Rando
Business Development
ErgoSoft US LLC
RIPs for Creative Professionals
919.467.4863 office
email@hidden
On Saturday, February 1, 2003, at 08:21 PM,
email@hidden wrote:
>
Message: 11
>
Date: Sat, 1 Feb 2003 11:01:23 -0700
>
To: email@hidden
>
From: Gary Smith <email@hidden>
>
Subject: Dry Time for UltraChrome inks
>
>
Hello all. I am going to be building several profiles for Epson 2200
>
and 7600 UltraChrome printers in the coming weeks. I was just curious
>
as to how long of a dry time will be needed for both Photo Black and
>
Matte Black prints. Is there a substantial change in LAB values after
>
a few minutes compared to 24 hours?
>
>
Gary Smith
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