Datacolor User to User Support Group.

Hi everyone,

I originally posted the following in the ColorSync-Users list at apple.com, where I was told 
to post it here, too - so that's what I do :-)

Currently, I have several colorimeter/spectrophotometer packages at home for evaluation 
and comparison, the X-Rite/GM product range (Eye-One Display, Eye-One Pro, huey Pro) 
and the ColorVision Spyder2Pro.

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. Not surprisingly, the Spyder produced 
yet another different, forth whitepoint. (Measurement conditions were the same.)

Now, I'm aware that (speaking in terms of an xyY chromaticity chart) there's many different 
possible (x,y) combinations to produce a 6500 K whitepoint, but as far as I know a D65 
whitepoint is an unambiguous standard (x=0.3127, y=0.3290).

So I would think it should be reasonable to expect some kind of consistency (at least in the 
product range of *one single manufacturer* ...). What's the point of having a standardized 
D65 setting if it means something different to each measurement device? That doesn't 
exactly build confidence with regard to color management.

I'm very puzzled by this experience, and would appreciate comments from the experts in 
this forum. Do I expect something unreasonable? Do others experience consistent D65 
results and I'm doing something wrong (no idea what that could be, though)?

Thanks in advance for any insight

Bye

Uli