Am 27.10.2012 16:56, schrieb Dale:

not exactly, you can't have an absolute profile connection space and
have appearance matching, you need a reference medium for the profile
connection space, which there is

D50 would be a better choice for an ideal additive reference system, it
could be used for some systems looking beyond the visual spectrum also,
whereas XYZ is limited to the visual spectrum

D50 is not a reference system. It is a white point. XYZ is an absolute
color system - you only need a white point if you need a white point
adaption, i.e. if you want to map the scene white point to the target
(display device, printer etc) white point. Not said that you shouldn't
do that, but that's a different task and part of what a CMM might or
might not implement, for example by means of a Bradford transformation.

Of course XYZ is "limited" to the visual spectrum, that's the whole
point of XYZ - what is visible by humans. If you need color matching for
your canary bird, well, XYZ and ICC profiles are not for you. But I
believe that then the market for such technology is pretty limited. (-: