question about adjusting color temperature of Dell ultrasharp 2407wfp to 6500K

Hi,

I have the NVidia GeForce 8800 GT display adapter.  My O/S is Vista.  The display is Dell Ultrasharp 2407wfp.

How do I set the color temperature to 6500K?  I don't see any way to set this via the NVidia control panel.  I am trying to do this as part of monitor calibration since I see a big difference between the color prints and what I am seeing on screen.  Setting the color temperature is part of the manual calibration process.

-EW