Is it advisable to turn off local dimming if calibrating to bt.1886? Even if local dimming will be used when viewing material to improve black level on a LED panel.
It messes up the test patterns so turn them off. Test patterns don't exactly represent real life material hence a test pattern.
Local dimming is like auto iris in a way ... not right or wrong ... but there to compensate for an inherent technology weakness. It had positives and negatives.
You want all the other "Auto" or "Dynamic" things turned off also as they can also alter the images in unwanted ways, even during calibration with simple patterns being displayed... but you don't want to turn any of those things back on after calibration. Some mid-to-high-end TV models have a room light sensor that changes the images in response to how much light is in the room... that should be off also.
Problem is night time watching of an edge lit led set is unbearable without local dimming on. Even with bias lighting.
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.
I have calibrated the panel with local dimming off then measured with local dimming on. It does have fairly big impact on gamma at 10,20 & 30 IRE and does cause a little gamma hump at 90. White balance does shift a little but we are only talking a minuscule difference.
Just for reference I am using I1 display 3 profiled to I1pro.
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.
Actually .... MArketing marketing ... they have added a local dimming feature to the edge lit too. It kicks on for w/s films ... making the black bars darker than before. No it is not as good a local dimming with backlit LED zones ... but it is better than nothing and they are calling it local dimming.
MArketing marketing ... they have added a local dimming feature to the edge lit too. It kicks on for w/s films ... making the black bars darker than before. No it is not as good a local dimming with backlit LED zones ... but it is better than nothing and they are calling it local dimming.