Why are there two different "D50" white points? CIE vs ICC?

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Roger Breton
Roger Breton 2022-3-29
回答： Roger Breton 2022-3-29
I have this code going :
wp_D50 = whitepoint('d50') % 0.9642 1.0000 0.8251
wp_D65 = whitepoint('d65') % 0.9505 1.0000 1.0888
wp_C = whitepoint('c') % 0.9807 1.0000 1.1823
wp_icc = whitepoint % 0.9642 1.0000 0.8249
I wonder where CIE D50 tristimulus values come from?
CIE Publication 15.2 - 1986 Page 55 Table 1.4 lists D50 XYZ as 96.42 100.00 82.49 :
For what is is worth, the ICC defines D50 XYZ this way, in Specification ICC.1:2010-12 (Profile version 4.3.0.0) on page 20 :
3.1.24
PCSXYZ
nCIEXYZ values that have been linearly scaled so that PCSXYZ X = 0,9642, PCSXYZ Y = 1,0, PCSXYZ Z = 0,8249 for media white

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回答（1 个）

Roger Breton
Roger Breton 2022-3-29
Got hold of CIE Publication 15.2:2004 and on Table T3, page 35, D50 is listed as 96.42 100.00 82.51.
A fresh search in my stock Excel sheets also turned out the same XYZ for D50 for the weighted ordinate method.
Egg on my face... Hope this helps someone. But I don't know where the difference comes come... If you know, please, say something... I'm all ears :-).

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