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Subject: Re: ACR v3.2 D2x white balance still not correct





As far as I understood, there is not a single absolute correct Kelvin
number to define white balance. Nikon thinks of it as 5200 K when Adobe,
due to different algorythms/profiles produces best results with 4800K.




It's actually a little more complicated. White balance involves two axes and these are handled in ACR via the temperature and tint controls. The temperature control adjusts in the yellow-blue axis and correlates with the color temperature of a black body radiator. The tint control adjusts in the magenta-green axis.

For a non black body radiator, there are lines of correlated color temperature running perpendicular to the yellow-blue axis of the black body radiator, corresponding to the magenta-green axis. A black body radiator at 6500 degrees Kelvin has a unique spectrum (D65), but a non-black body radiator with a correlated color temperature of 6500K produces colors which can vary in the magenta-green axis.

On my Nikon D70 I can set the color temperature for 6500K, but there is no way to set the magenta-green axis. I don't really know what the camera records for white balance, but more than a color temperature is needed.

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