[R] grDevices::convertColor XYZ space is it really xyY?

[Ken Knonlauch]

Bryan Hanson <hanson <at> depauw.edu> writes:

> 
> grDevices::convertColor has arguments 'from' and 'to' which can 
take on value 'XYZ'.  Can 
someone confirm
> that 'XYZ' is the same as the CIE chromaticity coordinates 
 are also sometimes refered to 
as 'xyY' in
> the literature?  Or are these the CIE tristimulus values?  
It looks to me like the first case is 
true, but I
> would appreciate hearing from one of the people in 
 know.  Thanks, Bryan
> 
> 

I.'d look at the code or put in some known data to test it, 
but XYZ are tristimulus values and xyY are chromaticity
coordinated and the luminance which is the Y tristimulus
value for the CIE 1931 standard observer.

Ken