Re: Barco vs Eizo
Re: Barco vs Eizo
- Subject: Re: Barco vs Eizo
- From: <email@hidden>
- Date: Wed, 14 Sep 2005 10:09:50 -0400
Michael,
I would like to see serious data validating this claim of
drift. This "conclusion" could happened if:
1- Someone measures a dark color at two locations on a
monitor and the values differs. Artisan, Eizo and the like
show a good uniformity (about 2 DeltaE*ab according to
many) but most standard monitors are not that good.
2- Any measurement on a CRT (a lot less for LCD) is
influenced by ambient lighting that comes from the thick
CRT glass. Similarly, if a dark color is adjacent to a
bright color, there will be contamination (also a lot less
for a LCD).
3- CRTs and LCDs do drift in light output from the time of
startup. The stabilisation time is from 30 minutes to over
an hour depending on models.
These phenomena could be associated to spectrometer
"drift" but are only due to "experimental conditions". All
of these can easily be verified with careful measurements.
Roger,
The answer you got from GMB makes sense since you only
need the dark current, which is calibrated each time you
need to use the Eye-One in emission or ambient mode, and
the response of the detectors as measured in reflectance.
I suspect the only reason for reflectance calibration
during normal operation is to compensate for the
illumination (the tungsten lamp), not for the detectors
response which is burned-in during factory recal (and
associated with the white tile).
Danny Pascale
email@hidden
www.BabelColor.com
On Wed, 14 Sep 2005 07:17:50 -0400
Roger Breton <email@hidden> wrote:
Therefore, if the EyeOne Pro
displays significant drift in the shadow areas, then
this could explain the
problem that the other individual was having.
Michael
I don't have specific evidence about the EyeOnePro
'drifting' in the
shadows, in emissive measurements, but I can tell you
that when
re-calibrating these instruments, only the reflectance
part is covered.
That's what GMB told me. That sounds so unlikely to me
but, to date, I still
don't know how they do it, if at all, in emissive mode.
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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