Bogus White Point Tags in Monitor Profiles?
Bogus White Point Tags in Monitor Profiles?
- Subject: Bogus White Point Tags in Monitor Profiles?
- From: JWL <email@hidden>
- Date: Sat, 10 May 2003 00:23:45 -0700
A couple questions from out here in the trenches:
I have noticed that some software packages create monitor profiles which,
when displayed in ColorThink, show incorrect values for white point color
temperature. For example, basICColor display and EyeOne Match (both versions
1 & 2) - when you create a profile specifying 6500K, they chart as if WP =
5000K. OptiCal- and Monico Optix-created profiles, OTOH, show WP values as
expected.
Moreover, the way such profiles get displayed in ColorThink (the 3D "volume"
view) varies in interesting ways. Some, like those generated by OptiCal &
the GretagMacbeth products, seem to show the 6500K profiles as virtually
same shape & volume as 5000K ones, except "moved" along the b axis, toward
the 'blue' (of course), and away from the 'yellow'. The Optix-generated one
though, had a transformed shape - the 5000K one incorporating much of the
6500K one's shape & expanding it toward the 'yellow' end of the b axis.
Anyway...
Question 1: Is this is bug in the software creating the profile (is the tag
really incorrect), or a bug in how ColorThink reads or displays profile
data?
Question 2: What exactly is the consequence for the user here? If the
profile WP (and the calibration) is really 6500K, but the tag is 5000K,
shouldn't this throw a major wrench into Photoshop's "display using monitor
compensation" function?
As always, any info & explanation is greatly appreciated.
John
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