Datacolor User to User Support Group.

--- In colorvision_group@yahoogroups.com, CDTobie@... wrote:
> D65 always means the same thing. 6500k can mean numerous things. ICC profiles 
> always list (by definition) a D50 whitepoint. There is a document on the 
> ColorVision website on proper transforms for monitor profiles not targetting D50, 
> which has pretty much become the standard for the transforms used to adjust 
> non D50 monitor whitepoints, so that they reconvert as expected.

Do you have a link for that document? I had a look, but couldn't find it.

> Don't expect identical results, even from the same tool used twice. Expect 
> somwhat larger variations from differing software, and larger still from 
> differing hardware and software, but all should be within reason. If they are way 
> off, then thats an actual problem, rather than a statistical variation.

I posted my measurement results already in Apple's ColorSync-Users list, but they might 
be interesting for readers of this group, too, and I'd be interested in whether you would 
qualify these results as "being within reason", or rather as "an actual problem":

Target value: 6500 K

Eye-One Display:   0.315   0.341     6316 K
Eye-One Pro:       0.314   0.333     6407 K
huey:              0.307   0.328     6836 K
Spyder2Pro:        0.313   0.325     6510 K
                  (0.311   0.321     6657 K  with ICC v4; is the chromatic adaptation 
transformation lossy?)
(Kelvin calculated by entering the xy results into Spyder's "user-defined whitepoint" dialog 
panel)

Bye

Uli