Re: Ooops - D65 != D65 ???
Re: Ooops - D65 != D65 ???
- Subject: Re: Ooops - D65 != D65 ???
- From: Uli Zappe <email@hidden>
- Date: Tue, 19 Jun 2007 04:17:53 +0200
Hi Tom,
Soon after starting to create test profiles, I realized that even
if I set the 3 different X-Rite products all to exactly the same
whitepoint/gamma settings, e.g. D65 G1.8, they produced profiles
with *very* different whitepoints.
How did you determine the white point in the profile?
I'm not sure whether you mean a) "specify" or b) "reconstruct" by
"determine".
a) various methods from automatic (Basic Mode), native, pop-up 6500
K, dialog window with my own (xy) settings - in each case, the
identical setting in the Eye-One Match 3 software produced very
different whitepoints depending on whether I use the Eye-One Display
or the Eye-One Pro. (And both differ very much from results produced
by the huey or by ColorVision's Spyder).
b) Switching between profiles in the Mac OS X System Preferences
instantly shows the big differences between the profiles. That's hard
to quantify, of course, but to give you an impression, I was able to
*roughly* approximate Eye-One Display's D65 with Eye-One Pro by
setting Eye-One Pro's whitepoint to x=0.3110 and y=0.3340 (and that
still does no emulate it 100%). And the huey D65 whitepoint looks
almost exactly like 7000 K in Eye-One Pro.
Here are some points to ponder [...]
While I understand that there are quite some complexities in the
background, from a user's perspective D65 should still be D65 in the
end. ;-) The trust in color management is really shaken by the
experience that D65 seems to be something different to each device.
When you go back through the proper scaling you should be very
close to the exact white point in all our products.
Well, both the Eye-One Display and the Eye-One Pro use the Eye-One
Match software. When I use exactly the same settings for both
devices, all the scaling issues should be addressed identically,
correct? And still, the resulting whitepoints differ a lot (see
above). With the huey, I wouldn't even have a chance to learn about
or modify the scaling settings, because it (rightly for its audience)
keeps all this perfectly hidden.
Actually, we make a free product http://www.xrite.com/
product_overview.aspx?Industry=1&Segment=11&ID=719 which allows you
to play with the data to your hearts content.
Thanks for the link! This is nice for playing with targets, but it
doesn't help analyze my current issue.
Steve Upton also makes a nice product called ColorThink ( I think)
that takes a rather honest look at profiles.
Yep, Robin Myers already pointed me to that, and I should surely have
a closer look at his ...
One final point: Xrite products currently have DNA from a number of
different companies which have recently merged, hence there are
certain differences found between applications.
I'm aware of that, but Eye-One is all Gretag Macbeth, and
specifically, Eye-One Match is Eye-One Match. :-)
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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