Originally Posted by Skood
The reason I asked the question is that local dimming on or off has a dramatic effect on black level which obviously has a major impact on gamma targets when calibrating to Bt.1886.
Edge lit doesn't really have local dimming, just dynamic dimming, you need to have back lit LED to do local dimming.
Bt.1886 primarily is factoring in the contrast ratio between black and white into it's formula, (although the absolute numbers to matter a bit). So calibrate with the dimming off, then you can turn it back on.
While it's on, you'll never be able to get meaningful information about what your gamma is doing.