[argyllcms] Re: Black-/White-Level Observer Dependency?

  • From: Graeme Gill <graeme@xxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Mon, 27 Sep 2010 23:18:32 +1000

Sam Berry wrote:
I would also add that the calculation of daylight and blackbody points can
usually be considered outside the closed system, and so trusting any
calibration utility to set D65 using the 10 degree observer is likely to
give meaningless results (ColorNavigator excepted perhaps). The observers
only match numerically at x=y=1/3. D65 is only x,y=0.3127,0.3290 using the 2
degree observer. Using any other observer the numbers are just a random
shade of white-ish. A new set of BB and daylight curves would need to be

Good point. I will fix dispcal and spotread so that the color temperature
correctly takes into account a non-standard observer (I overlooked this
in adding an alternate observer).

Graeme Gill.

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