RE: Ooops - D65 != D65 ???
RE: Ooops - D65 != D65 ???
- Subject: RE: Ooops - D65 != D65 ???
- From: "Robert Rock" <email@hidden>
- Date: Tue, 19 Jun 2007 06:52:36 -0400
- Organization: P. Chan & Edward, Inc.
To all,
So for many of us less technically proficient readers out here, is it
suggested that we should ALWAYS use the D50 setting and NOT the D65 setting
when creating our display profiles? For some reason I thought I recall
reading in another discussion that the general trend now is calibrate all
displays to 6500 degrees (D65), NOT the graphic arts standard of D50. I'm a
little confused.
Second question, should I be using the "native white point" of my display,
as I've heard many suggest, or should I manually set the RGB guns of the
display?
Thanks for your help,
Bob Rock
-----Original Message-----
From: colorsync-users-bounces+bobrock=email@hidden
[mailto:colorsync-users-bounces+bobrock=email@hidden] On
Behalf Of Uli Zappe
Sent: Monday, June 18, 2007 10:26 PM
To: email@hidden
Cc: email@hidden
Subject: Re: Ooops - D65 != D65 ???
Am 19.06.2007 um 03:16 schrieb Graeme Gill:
> This is really an ICC problem. There has always been "ambiguity"
> about a display profiles white point [...]
Thanks a lot for this instructive history!
Robin Myers inspired me to look at the settings of the apps I used,
and it turned out that both the Eye-One and the ColorVision software
were set to v2.
Changing the setting to v4 had no immediately visible influence on
the generated Eye-One profile, i.e. the profile still, and now
explicitly against the v4 spec, uses "lumi" to store the whitepoint
settings. ColorVision's software, in contrast, modified its profile
to conform to the v4 spec: "wtpt" now contains 0,9642-1,0000-0,8249,
just as the spec demands (and Eye-One already did for v2 profiles),
and there's an additional "chad" (chromatic adaptation) entry that
contains a matrix which obviously transforms the configured
whitepoint to D50; so this is obviously ColorVision's new (and
seemingly correct) place to store whitepoint data.
The actual issue of different D65 whitepoints is not getting closer
to being fixed with the v4 setting, however.
Bye
Uli
________________________________________________________
Uli Zappe, Solmsstraße 5, D-65189 Wiesbaden, Germany
http://www.ritual.org
Fon: +49-700-ULIZAPPE
Fax: +49-700-ZAPPEFAX
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