Re: Quantifying LCD Uniformity
Re: Quantifying LCD Uniformity
- Subject: Re: Quantifying LCD Uniformity
- From: <email@hidden>
- Date: Thu, 25 May 2006 22:35:09 -0400
Richard,
There are a few standards that you can use as a base, such
as ISO 3664 and ISO 12646. They have specs for
chromaticity tolerance, luminance, and brightness
uniformity. These specs should be easy to meet for a
high-end monitor, but what you see seems odd, and not
characteristic of an Eizo monitors, which are generally
much appreciated.
If you want to have a look at the ISO standards mentioned
above, I suggest the
Spectral tools description/ISO 3664+ tools description
section of the following pdf:
http://www.babelcolor.com/download/BabelColor_Help.pdf
which presents a snapshot of the requirements. You may
find the brightness requirement a bit low for an LCD,
these specs were written at a time where CRTs were still
abundant, but they still apply if you work in the
prescribed low ambient light environment.
In ISO 12646, the brigthness uniformity should be 90%,
with essentially the center compared to points which are
1/4 height and 1/4 width away from the edges (see also
Tutorial 8 of the above pdf for more info). These
standards may not be much but there are not that many of
them available.
Hope this helps,
Danny Pascale
email@hidden
www.BabelColor.com
On Thu, 25 May 2006 17:25:29 -0400
Richard Booth <email@hidden> wrote:
I recently purchased an Eizo CE210 LCD and was not happy
with the the lack
of both grey balance and luminance across the panel.
There was a visible
blue cast and flare in the left 25% of a 21² monitor.
For calibration I
tried both the Color NavigatorCE and Monaco Optix Pro.
When using the
Monaco Optix Pro, you have the option to Evaluate the
Monitor Profile. If I
do an Evaluation with the puck in the same location as
where the calibration
was done, I get a Delta E of slightly more than 1. If I
place the puck and
run the evaluation in the bluish region on the left, I
get a Delta E of 5
6. Both evaluations were done almost immediately after
the calibrations.
Is this a valid method of quantifying what I find is an
unacceptable, for
color critical work, lack of uniformity?
Rich Booth
Newtown, CT
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