Oh, and it also has 14-bit 3D LUT implemented in hardware, but I'm not sure how to use that, or what's the benefit.
That's for the hardware calibration. It generates 3D LUT stored in your panel, and is seen as ideal panel by your system. Often, you can keep different profiles this way ( I keep 'sRGB' and 'AdobeRGB' profiles ).
Actually the main reason I didn't used the X-Rite iDisplay Pro is because sometimes in the past when I used a software only calibration, the colors always were worse after, than before. And the monitor looks really good as it is right now.
Do you know if there's a way to "store" the current colors and calibration before I use the X-Rite iDisplay, so I can revert back in case I don't like it ?
Do you know some kind of forums dealing with monitors and calibration ? So I can learn some more about it. Everytime I searched I only found discussions related to printing and calibration. But never about the calibration for graphics and film.
Yes of course, in both software and hardware calibration you generate a LUT that's stored as .icc profile in Windows color management. You can save as many as you want and always come back to yours.
If you calibrate hardware-level, the LUT is stored primarily in your monitor OSD (and doesn't overwrite your factory settings), and you can even keep generic .icc ( like sRGB ) in Windows then, that is absolutely safeproof way.
NEC SpectraViewII does support iDisplay Pro. For some reason...lot of these high-end brands made hardware calibrations into closed systems that work properly only with their own software. So for example with Dell, you cannot even use X-Rite software with X-Rite sond, you have to use Dell suite instead.
So nothing to loose, give it a shot again :- )