Re: Eizo CG220 uniformity
Re: Eizo CG220 uniformity
- Subject: Re: Eizo CG220 uniformity
- From: <email@hidden>
- Date: Tue, 12 Jul 2005 13:50:39 -0400
Mike,
It may not be as bad as you think!
or...
It will not be as good as you wish!
or...
Both!
According to
ISO 12646 Graphic technology displays for colour
proofing
characteristics and viewing conditions
a display can have up to 10% brightness non-uniformity
between the center and a point located at 25% of the
display width from the left edge and 25% of the display
height from the top and (and similar points located around
the center). The fall-off can be more in the extreme
corner.
Translated in DeltaE, this brightness non-uniformity is 10
DeltaE*ab, a lot less or somewhat less for CIEDE2000,
depending on the actual color.
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 (different White Points and correlated
color temperatures), and there is also a specification for
those in ISO 12646 (as well as in ISO 3664: Viewing
conditions - for Graphic Technology and Photography).
You may not be happy that your high-end display shows such
variations but it should be compared against generic
display to see how really good it is. Remember that the
above ISO standards were done for those who have higher
color accuracy requirements; hopefully, your display meets
them.
Danny Pascale
dpascale AT babelcolor DOT com
www.babelcolor.com
On Tue, 12 Jul 2005 12:36:34 -0400
"Mike Eddington" <email@hidden> wrote:
For those with experience with the Eizo CG220, could you
comment on
screen uniformity in comparison to other LCDs,
particularly the CG21? I
believe I've read on the list in the past that the CG21
was more uniform
with a better viewing angle than the CG220, and that
certainly seems to
be the case here. For example, if evaluate a profile
created using
Monaco Optix w/ i1Pro, comparing known Colorchecker Lab
values to
measure Lab, dead center of the screen I get an average
delta E of 1.34.
The same evaluation taken in the top left of the screen
yields an
average delta E of 4.2. Measuring solid patches, I have
gotten up to 5.5
delta E 2000 from the center. I expect some deviation
off center, but
this is a bit more than I was expecting.
Also, is there an ideal setting for covering the
AdobeRGB space?
Michael Eddington
North American Color, Inc.
www.nac-mi.com
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