Re: Eizo CG220 uniformity
Re: Eizo CG220 uniformity
- Subject: Re: Eizo CG220 uniformity
- From: <email@hidden>
- Date: Wed, 13 Jul 2005 00:02:23 -0400
On Tue, 12 Jul 2005 16:23:41 -0400
"Mike Eddington" <email@hidden> wrote:
(snip)
I would say that as long as the error is mostly in
Luminance you are OK. There could be small differences in
hue and chroma also
Actually the deviation is split between luminance and
hue, with
sometimes hue being the larger issue. In particular, an
area that
measures DE2000 4.3 shows deltaL at 1.3, deltaC: 0.3,
and deltaH 3.1. I
don't know if that would be inside ISO tolerances, but I
can see it both
in solid tints and images displayed in Photoshop, moving
towards green off center.
The ISO chromaticity tolerance is expressed as a radius in
the UCS (Uniform Chromaticity Scale) where the two axes
are u' and v'. A hue shift will correspond to different
radiuses depending on the actual color.
The acceptable radius is 0.025 in ISO 3664 and 0.010 in
ISO 12646. Even with a 3.1 deltaH, it may well be that
your display meets these spec.
(snip)
I've been comparing it to a Eizo CG21, as well as an
Eizo L885 (not
really generic monitors, I know) and both are visually
more uniform than
the CG220 and measure a max DE2000 of 2.5-3 from the
center, primarily
luminance. An Apple Cinema display here has one corner
that measures
nearly 6 DE2000, but the rest of the monitor is within
2.5, and nearly
all the deviation is in luminance. I compared it to a
Sony Artisan also,
but it hardly seemed fair...max DE .9. I don't really
expect it to be
THAT uniform, but for the price, at least a little more
comparable to the other Eizo's.
I understand your frustration. The display market is
obviously driven by high volume applications without too
much concerns for customers requiring high accuracy
devices, except by a few niche players. The LCD technology
is not yet mature but it must really be full of promises
since all manufacturers are dropping their older (and
sometimes better) CRT technology. It is like GM dropping
production of all fossil fuel cars now because the
hydrogen cars have more potential (or so they say)!
0.9 DE uniformity for an Artisan! Please stop!
I wonder how long it will take to approach or match that
with LCDs? Two or three years maybe; in the meantime, we
will have to live with good but not great displays (most
of us with normal budgets anyway).
Danny Pascale
dpascale AT babelcolor DOT com
www.BabelColor.com
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