Posted by Peter Karp from Quato on Colorsync list:
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> What is the purpose of your correction matrix? You use
> top-of-the-line instruments to correct the display relative to what?
We use the Minoltas to create a calibration matrix for the
colorimeters for a _specific_ display model. Especially the DTP94 we
still bundle with our displays will need/benefit from a custom
calibration to a specific display model.
A perfect colorimeter would simulate the response of our eye (CIE 1931
standard observer color matching function to be more specific)
perfectly. Real world colorimeters will not reach this goal totally --
one exception for example is the colorimeter from LMT, Berlin which
uses many tiny filter elements to match the CMFs very close. Low-Cost
colorimeters will have filters which will not match the CMFs. The
subject of building measuring devices for "color" is very interesting
So most colorimeters for desktop usage like the ones used in our
industries must be calibrated to a specific device. _Then_ and only
then the measurements will be very accurate. For other devices the
measurement accuracy will be worse. Because the monitor is not known
at first hand the manufacturer has to choose some sample monitors and
create an average calibration which matches the average of the sample
monitors -- therefore you'll get "average accuracy" on your average
display. The accuracy will be improved much, when the specific device
is known and is used for the calibration of the device.
Those facts are the reason why you need to choose "CRT" vs. "LCD" in
several monitor calibration packages. One setting will load the
calibration for an average CRT and the other for an "average LCD".
For CRTs the calibration was fairly accurate because most CRTs had a
similar gamut, but for LCDs the differences are much broader --
threngthening the need/benefits of a custom calibration.
*** End quote ***http://lists.apple.com/archives/Colorsync-...b/msg00145.html
*** Begin quote ***
> "Calibration matrix"? As in "correction matrix" perhaps? If that's
> what you're refering to, the only such animal that approaches this
> concept is Eizo's ColorNavigator v5 instrument-specific correction
That's wrong. Quato uses a correction matrix (or specific calibration
matrix as you might name it too) for quite some time. This feature was
introduced with the wide-gamut "Intelli Proof 230 Excellence" Displays
in January 2007. Our reference measurements are made with a Minolta
CS-1000 and CS-200, so the display specific calibration matrix will
give far superior results in comparison to a default calibration
matrix which must match a "default standard display" whatever the
manufacturer of the colorimeter chooses this to be.
Every display will benefit from a custom calibration matrix, but
wide-gamut displays will benefit especially, because the colorimeters
are normally calibrated to one or more sample "standard" displays.
Maybe Tom Lianza can tell us more about the displays X-Rite chooses
for that purpose.
*** End quote ***http://lists.apple.com/archives/Colorsync-...b/msg00124.html