Re: Paper white and filters
Re: Paper white and filters
- Subject: Re: Paper white and filters
- From: Darrin Southern <email@hidden>
- Date: Mon, 26 Feb 2001 10:52:33 +1100
Henrik wrote:
>
As I understand you, the BEST profiles do rely on a filter, but it's
>
the software filter in Printopen which corrects for blue in the media
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white point. The perceptual and relative colorimetric tables are
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media relative, so optical brightener affects the graybalance. Right
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out of the box Printopen defaults to correcting for optical
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brightener which is also why the BEST profiles sensibly maintain this
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default. The BEST profiles weren't measured with the Printopen filter
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off and a hardware UV filter on the spectrophotometer.
Ulf wrote:
>
If we have problems with the Paper White, we do an correction via White
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Point correction from PO 4.0.1 (direct change from the Lab-Value like in
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ColorBlind Edit). We do also only global corrections inside the Profile and
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no selective corrections, if we have too much problems, we start the
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Profiling again with a new Baselinearization and new measurements.
I have been following this thread, but no one has defined at what stage the
rendering intent (from within BEST - profile window) kicks in and exactly
how the Colormetric-relative (no paper white) Colormetric-absolute (paper
white) and also the Photo realistic works with the CMM in the Profiles and
the CMM within BEST.
Ulf, could you also explain when the CMM was changed within BEST, and how
this differs when 'one' builds profiles with profiling software that uses
the Heidelberg CMM, and for those packages that don't.
>
all new Profiles from BEST Germany are created without any filter. No filter
>
is used during measurement and in PO no Software filter is set. With the new
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Version of BC (4.2.2) you get problems if you use the software filter from
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PO, the Paper White is to Blue.
Ulf, you mention 'BC 4.2.2', when is this going to be available, and what
other changes have been made within the BEST ?
One final point, I can really see a need for a 'BEST users forum' - english
please, to be run by BEST, and to be moderated by yourself. I think it
should be run on your servers, but even an eGroups forum to start with.
What do you think ?
Darrin.