Re: Barco vs Eizo
Re: Barco vs Eizo
- Subject: Re: Barco vs Eizo
- From: bruce fraser <email@hidden>
- Date: Tue, 13 Sep 2005 20:21:03 -0400
At 5:48 PM -0700 9/10/05, Busher Jr Richard C wrote:
I have several Barcos and I just bought a new Ref. V a few weeks
ago. Why? Many times I have done the following experiment: Create a
variety of Lab colors in PS. Measure the colors with the Optisense.
If the colors are within the monitor's color space (essentially
ColorMatch rgb, i.e. the color space of crt's in general) the
Optisense tells me that the measured colors are within 2 delta E's
of the specified PS Lab values in most cases, often times close to 1
delta E. Of course I can specify Lab colors that lie outside the
monitor's color space, but then they cannot be displayed properly on
the monitor and any measurement would be meaningless.
This is not unusual, should be attainable with any decent monitor and
calibration package, and is pretty much inevitable with the Barco Ref
V system because the instrument is a simple luminance meter-the
coordinates of teh primaries are burned into ROMs at the factory. But
the bottom line is that you're using the same hardware and software
to measure the colors that you used to calibrate and profile the
display, so it's altogether likely that it's going to agree with
itself.
To make a real evaluation is a lot more complex. You need to
understand the rendering intent being used to convert the Lab colors
to RGB display values, you need to decide whether or not to normalize
the Lightness channel in Lab to the luminance of your monitor, and if
you're using a non-D50 white point, you need to understand the
implications of the various white point adaptation algorithms.
I can tell you that the NEC 2180WG displays all 24 colors on the
Macbeth Color Checker within 2 delta-e after taking into account
white point adaptation and luminance. But that really isn't saying
very much....
Bruce
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