Originally Posted by pentium7
Could anyone please direct me to the best calibration settings for dark room viewing on 64F8500 ?
I've tried 2 so far but they seem more geared toward lighter situations. The display is located in master bedroom and with window treatments so there is very little light even during the day, mostly viewed at night anyway in the dark.
Thanks in advance.
I suggest keeping at least a couple lamps on. The blacks on these TVs are pretty good, but they can still benefit from a little room lighting to look even deeper. They don't have to be bright lights btw. 100-200 lumen bulbs (~15-25 watts incandescent or equivalent) should be sufficient.
If the TV is still too bright for night time viewing with a couple lights on, then lower the Cell Light setting until it's more comfortable for your eyes. Lowering Gamma is also an option. That will increase the contrast in the image by darkening the midtones. You should leave the Contrast control set fairly high though, in the 95 range, because lowering Contrast will increase the dithering in the image.
On the 43F4500, I would actually start with Cell Light at 0, and then gradually raise it until the picture was comfortable for viewing. You could also try using different Eco Solution/Energy Saving settings to reduce the display's light output in addition to or instead of Cell Light, but that's not something I experimented with, and Cell Light will probably give better control. Leave the Eco Sensor off though.
I also recommend setting the Black Optimizer to Dark Room. That may add some slight fluctuations to the picture, but it should lower the MLL on darker scenes... if it's working correctly.
Last but not least, adjust the Brightness so there is no dithering visible on a reference black screen. The easiest way to do that is to display a Y'=16 black pattern on the screen, and then raise Brightness until you begin to some dithering (dancing multi-colored pixels). Then gradually reduce the Brightness control until you get to the highest setting that has no dithering/dancing pixels visible.
If you don't have a calibration disc with a Y'=16 reference black handy for this, you can use the black bars on a widescreen film like Star Wars ANH instead, preferably in one of the darker space scenes. Some dithering within the image is ok, but there should be no dithering visible in the black bars on a film like that.
Most of the other settings above will effect the adjustment of the Brightness control. So set the Brightness last after making any other picture adjustments.
To reduce the chances of burn-in, try to keep your viewing of letterboxed and pillarboxed content to a minimum, and don't linger too long in the TV's menus while the TV is breaking in, esp. at high Cell Light settings.