RE: Eizo CG220 uniformity
RE: Eizo CG220 uniformity
- Subject: RE: Eizo CG220 uniformity
- From: "Mike Eddington" <email@hidden>
- Date: Tue, 12 Jul 2005 16:23:41 -0400
- Thread-topic: Eizo CG220 uniformity
Thanks for the response...
>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.
In some cases, the DE2000 metric is higher than the DEab, though only
slightly.
>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.
>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
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.
Michael Eddington
North American Color, Inc.
www.nac-mi.com
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