scott wrote:

> That's not strictly true.  When dealing with reflective surfaces, you 
> need to specify the *illuminant* used, but with CIELAB you need to 
> additionally specify a reference white - these do not necessarily need 
> to be the same thing.  If you are using XYZ (or xyY, Yuv, Yu'v' etc) 
> then you only need specify the illuminant.
> 
> That is why in our specs for emissive displays, if the customer wants 
> XYZ values they just get XYZ values, but if they want CIELAB then the 
> reference white needs to be specified for it to make sense.
> 

Yes, OK, but I always failed to see the reason why anybody would use
L*a*b with e.g. D65 'cause every piece of hardware and any color 
management software I could put my hands on is using D50.

Otherwise I'm happy that things seem to be clear now ;)

-Ive

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