RE: Dryingtime before profiling matte paper
RE: Dryingtime before profiling matte paper
- Subject: RE: Dryingtime before profiling matte paper
- From: bruce fraser <email@hidden>
- Date: Fri, 14 Jan 2005 14:38:51 -0800
Ultrachrome shifts, not as much as dyes, but it DOES shift while it's
curing. You probably won't see it with the naked eye, but it's
measureable and consistent.
The vast majority of the shift happens in the first couple of hours,
and is strongest in the dark greens and reds (black loses a little
density, and the C, M and Y shift hue in different directions, so
it's a bigger shift than you'd notice from just measuring the solid
primaries).
Typical worst-case patches shift by about 1.4 delta-e over the first
12-18 hours depending on the paper, which is too big a shift to be
attributable to instrument drift (my ICColor and SpectroScan both
seem consistent within about 0.1 delta-e), and is just enough to be
of concern when you're measuring a profiling target.
I usually let profiling targets cure for 24 hours to be safe-after
that they're rock-solid on all the Epson papers. It may be overkill,
but I've found that a 1.4 delta-e error in the profiling target can
translate to a 3 delta-e error in the profile. 3 delta-e in a dark
green is still quite hard to see unless you know it's there...
Bruce
At 3:36 PM -0500 1/14/05, Mike Eddington wrote:
> >> Stories tells that ink (like Epson UC inks) change over a few
>> days!!!! I know that it changes a lot in the first hour and its
>> visible by eyes.
That statement is in direct opposition with my own personnal
experience.
Regards,
Roger Breton | Laval, Canada | email@hidden
Ditto. I've seen this with the Epson photo dye inks, but not
Ultrachrome, which are stable pratically right off the printer.
mike
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