Bogus White Point Tags in Monitor Profiles?
Bogus White Point Tags in Monitor Profiles?
- Subject: Bogus White Point Tags in Monitor Profiles?
- From: Ian Lyons <email@hidden>
- Date: Sat, 10 May 2003 09:33:55 +0100
>
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.
There is nothing wrong with the profiles. What you are seeing is Gretag and
BasICColor choosing to 3adapt2 the media (display) white point profiles to
the standard (at least it was) D50 white point. You will find that the
actual RGB colorant values indicated for your display are also weird. They
too have been adapted but this time so that the first adpation is
compensated for. The profiles are accurate and your images will all display
as they should and the profiles. I can recall Bruce Lindbloom explaining
what you are seeing on an earlier occasion.
Folk with versions of Gretag PMPro stretching back to when Moses was still
in his basket they should have noted what you are seeing (many didn9t). I
know Gretag changed PMPro 4 to reflect the more common method of profiles
showing 6500K when the user calibrated for 6500K, etc. I was also of the
understanding that they had intended to make i1Match 2 consistent with PMPro
4.x. So I was both disappointed and SURPRISED to find the final release of
i1Match was still using the D50 adaption method.
Ian Lyons
http://www.computer-darkroom.com
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