Re: Colorsync-users Digest, Vol 5, Issue 148
Re: Colorsync-users Digest, Vol 5, Issue 148
- Subject: Re: Colorsync-users Digest, Vol 5, Issue 148
- From: Mike Eddington <email@hidden>
- Date: Thu, 1 May 2008 10:14:12 -0400
The target is basically RGB values thrown through the monitor
profile to derive a reference, then it compares that to measured
values.
That is not exactly correct.
The monitor validation procedure uses one of two methods, depending
on the software package:
1) It starts off with a list of RGB numbers, looks up their
corresponding Lab values once the monitor profile is assigned to
them, registers the Lab values read by the colorimeter from the
monitor for each patch, compares the measured Lab values to the Lab
values expected from assigning the profile, and finally derives
DeltaE values from the comparison;
Thanks for the clarification. That's essentially what I was referring
to, though in more lowbrow terms (for Terry's benefit). ;)
or:
2) It starts off with a list of Lab values, converts them to the
monitor profile, sends the resulting RGB values to the monitor,
registers the Lab values read by the colorimeter from the monitor
for each patch, compares the measured Lab values to the Lab values
in the original list, then finally derives the DeltaE values from
the comparison.
Seems like the former method might give more accurate results, as a
given Lab list might contain values not reproducible on a given monitor.
Michael Eddington
QA Manager/G7 Certified Expert
North American Color, Inc.
www.nac-mi.com
www.nac1to1.com
www.photo360.com
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