Re: dry down
Re: dry down
- Subject: Re: dry down
- From: Terry Wyse <email@hidden>
- Date: Tue, 20 Nov 2001 19:31:05 -0500
on 11/19/01 7:51 PM, email@hidden wrote:
>
What is an appropriate amount of "dry-down" time before taking measurements
>
with a Spectrophotometer? We print targets on both coated and un-coated
>
papers with both drop-on-demand and continuous-flow inkjets.
You really ought to perform a sort of ink stability or "dry down" test for
yourself. It's VERY dependent on a given printer, ink, paper combination.
For example, I've been doing a few tests of my own with an Epson 5000 and
5500. The 5000 (dye inks) will shift for DAYS and probably shouldn't be
measured for 12-24 hrs. after existing the printer. The 5500 (pig inks) on
the other hand is rock solid virtually when the paper exits the printer and
will change less than 3 deltaE after several days (the 5000 can change that
much in a matter of minutes!). So, you see, it depends.
If you've got the time, I'd do a week long test and measure a testchart(s)
at regular intervals, say every couple of hours for the first 24 hours and
then maybe every 12-24 after that until one week has elapsed. Then compare
all the measurement data. You should be able to find the "sweet spot" where
a print is reasonably stable.
The other approach is to measure the target at roughly the same time the
proofs will be viewed for critical color and just understand that at any
point much less/more than that the print may have shifted enough to be
invalid. At any rate, I'd wait AT LEAST an hour before measuring.
Good luck,
Terry
_____________________________
Terence L. Wyse
Color Management Specialist
All Systems Integration, Inc.
http://www.allsystems.com
email@hidden
_____________________________
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