Re: Monitor profile verification [was: Eye One Pro for monitor calibration? [was: Re: NEC 2690 SpectraView]]
Re: Monitor profile verification [was: Eye One Pro for monitor calibration? [was: Re: NEC 2690 SpectraView]]
- Subject: Re: Monitor profile verification [was: Eye One Pro for monitor calibration? [was: Re: NEC 2690 SpectraView]]
- From: Terry Wyse <email@hidden>
- Date: Sun, 2 Dec 2007 08:49:29 -0500
Thinking...thinking...oh yea, I'm not sure this is exactly right.
Please correct me if I'm wrong, but I assumed it was L*a*b* numbers
that were sent through the monitor profile, converted to RGB, sent to
the display and then measured with the colorimeter/spectro with the
resulting L*a*b* values compared back to the original L*a*b*.
I'm pretty sure this is the case with Monaco PROFILER's and OPTIX
monitor+profile evaluation routine because I'm looking at the
reference file they use for monitor evaluation (Macbeth ColorChecker)
and it's a list of L*a*b* values.
Of course, I assume other monitor verification tools could do just the
opposite.
Regards,
Terry Wyse
On Dec 2, 2007, at 4:05 AM, Marco Ugolini wrote:
he verification procedure starts with a list of RGB numbers that are
being
sent to the display: at their origin, these RGB numbers are simply
numbers,
and have no *inherent* colorimetric appearance. It's only by virtue
of the
active monitor profile that they assume a definite colorimetric
appearance.
Next, the verification procedure takes measurements with the
colorimeter;
after that, it normalizes and adapts the measurements chromatically
to the
monitor profile's white point.
Finally, it produces two lists:
(1) A list of the L*a*b* numbers that are derived from the initial RGB
numbers when the active monitor profile is assigned to them (reference
values);
(2) The colorimetric values *actually* measured off the display
(normalized
and chromatically adapted).
The resulting DeltaE numbers are calculated from the comparison of
these two
lists of colorimetric values.
_____________________________
WyseConsul
Color Management Consulting
G7 Certified Expert
email@hidden
704.843.0858
http://www.wyseconsul.com
http://www.colormanagementgroup.com
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