Re: DELL U2410 and ISO conformance
Re: DELL U2410 and ISO conformance
- Subject: Re: DELL U2410 and ISO conformance
- From: dpascale <email@hidden>
- Date: Wed, 20 Jun 2012 17:48:43 -0400
Hello Ken,
1) Does it seem possible for one monitor of this model to exhibit poor
field-of-view characteristics while others of the same model are
significantly better?
Yes, I have seen messages of users which had this kind of problem with this
model, which seemed to be related to date (earlier revisions) and place of
assembly (Mexican models better than European models at a time). I have had
a Dell U2410 for a few years (assembled in Mexico) which does not exhibit
this problem .
2) Is it uncommon for a monitor to pass the ISO conformance tests yet
still
appear so non-uniform?
Yes, ISO chromaticity test is pretty loose. It was done a time where LCD
monitors were not common.
Please note that chromaticity uniformity is not measured, just the shift
relative to a target value.; this is not the same thing!
Also, if I recall correctly, ISO 12646 has a tolerance of 0.010
(chromaticity radius) instead of 0.025 (and for D50). How do your
measurements fit with this smaller radius?
3) Does anyone have any other suggestions as to what may be the cause of
the non-uniformity?
Uneven pressure of the assembly bezel?
Aging?
Danny
----- Original Message -----
From: "Ken Fleisher" <email@hidden>
To: "ColorSync Users Mailing List" <email@hidden>
Sent: Wednesday, June 20, 2012 4:43 PM
Subject: DELL U2410 and ISO conformance
Hello. We use the Dell U2410 monitor for some of our less critical color
stations. One particular monitor shows a pretty strong color shift from
side-to-side (green-to-magenta), especially when viewing a solid gray
screen. To see if the monitor has a hardware problem, I used an i1Pro and
BabelColor CT&A to test for ISO 3664 conformance. I was actually surprised
when the monitor passed all of the tests, since I was expecting it to fail
on either the uniformity or the chromaticity. Despite the numbers, the
monitor is visually non-uniform.
I suspect that it is a field-of-view issue. My questions are:
1) Does it seem possible for one monitor of this model to exhibit poor
field-of-view characteristics while others of the same model are
significantly better?
2) Is it uncommon for a monitor to pass the ISO conformance tests yet
still
appear so non-uniform?
3) Does anyone have any other suggestions as to what may be the cause of
the non-uniformity?
Thanks in advance for your help!
Ken Fleisher
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