Radically different readings from X-Rite 530 and 939 on yellow ink
Radically different readings from X-Rite 530 and 939 on yellow ink
- Subject: Radically different readings from X-Rite 530 and 939 on yellow ink
- From: Martin Diers <email@hidden>
- Date: Tue, 22 Dec 2009 14:38:38 -0600
I am working on becoming a certified vendor for a major electronics
department store who has very stringent QA. I need to hit a DeltaE94 of
3.0 or less on their company colors(on most colors. 4.0 on some of them).
Here is the basic setup: They run an old Leggett & Platt UV printer.
They have X-Rite 530s and a 939. Their instruments are 3 years old, but
are certified annually.
We have Fujifilm Acuity UV printers, and Sericol ink. We also have an
X-Rite 530. Our instrument is a couple of months old.
We have verified our references, and carefully checked all Density
settings. We both are set to 50k/ 2 degrees, Density status T. I ordered
a UV-cut filter, and tried all these test with and without it.
The material we are printing to is Styrene. There are no UV brighteners
in it.
When we measure their L&P print, our 530 readings match theirs closely.
When we measure our Acuity print, on any swatch with a significant
amount of yellow ink, our readings are wildly off. Other patches,
however, match their instruments. For example, on a Yellow swatch, we
read a DeltaE of 3.5. Their instruments, two 530s and the 939, read a
DeltaE of 17. The same thing happens on any oranges, and on some other
colors, in lesser degrees. It is consistent, however.
The more Yellow ink, the farther it is off. Pantone 286 reads the same
between our instruments. We have no yellow ink in that swatch.
Now, I know for a fact that our Yellow swatch does not have a DeltaE of
17 from their target. If it did it would be blatantly obvious. To the
naked eye, our swatch is a tight match to theirs. For this reason, I
believe that our instrument is reading correctly. However, all three of
theirs do not.
What is maddening is that if we are dealing with their L&P prints, the
Yellow matches across all instruments.
The only other possible variable that I can think of is if perhaps they
are using polarized apertures on their instruments, to eliminate
side-scatter on a reading. That doesn't really make any sense, however,
because if it were the polarization filter, it would not be consistently
off in a single channel.
The major electronics retailer is just as confused. They recognize that
there is an instrument problem, and it's with their instruments.
However, we've gotten nowhere yet with X-Rite. They don't admit to there
being any change in the instruments.
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden