Originally Posted by Ken Ross
Eagle, is it possible that the self-generated demo engages settings that would normally not be engaged for regular programming? I confess to being unfamiliar with some of these Samsung terminologies. Is 'auto dimming' something that is coupled to an ambient light room sensor? I'm not sure what role this dimming would play if not related to micro dimming. It's hard to see how these two different dimming settings wouldn't step over each other.
It also seemed as if AGuy implied that all of these dimming techs can be turned on or off in any mode.
Perhaps AGuy can shed some 'light' on this?
The auto-dimming does not appear to be tied into any light sensor or ambient light detector. Instead, it's based solely on the brightness of the screen image. That's why the workaround is able to overcome the auto-dimming (at least last year). The higher you adjust the brightness setting, the less aggressive the auto-dimming is. At a brightness setting of 46-48 (average setting last year), the auto-dimming is very aggressive. If you move the brightness slider up to around 55-60, it becomes virtually unnoticeable. Having the main menu up last year was an easy way to see how aggressive it was. Just pull up the main menu, and put on the end of a film while the credits are rolling against a black screen. My test was using Star Trek - the Next Generation because the opening titles sequence caused the auto dimming to go all over the place as bright planets whooshed by the screen against the black of space. By the time brightness was moved up to around 58, it was clear that auto-dimming was virtually defeated. But of course, brightness was now far too high. So to compensate you would drop the white balance offsets equally until the screen dropped back to normal brightness again. This defeated auto-dimming because it seems auto-dimming is directly linked to the brightness setting - if the brightness is set high, auto-dimming doesn't kick in because the tv thinks the screen never hits a low enough threshold to need to dim, based solely on the setting of brightness, even though in reality the offsets have brought the brightness back down to normal again. It was a clever workaround that somebody figured out last year and it was the only was I could tolerate the auto-dimming, because it was basically gone with that tweak.
Also, last year the screen had a nasty habit of turning off completely when the screen showed nothing but black. Probably to try and hide all the lousy screen abnormalities like clouding. But this was very annoying when your film would fade to black between scenes, because the tv panel would literally shut of it's illumination, and pop back on again when the scene faded back in. Turning the brightness up past 47 or 48 seemed to defeat that annoyance also, so it seems those "features" were tied directly into the brightness setting last year. I wasn't able to tell yesterday if the screen turned off with black fades - so I don't know if the behavior will be the same this year. If the panels are as good as they are supposed to be this year, and the blacks are so good, then I don't see why the tv panel should need to turn off with black fades, since it should be able to present a nice true black screen without turning off the panel illumination.
From what I could see, these auto-dimming "features" could not be disabled - just like last year. I saw nothing in the settings that disabled the dimming I saw, and most of the settings in the menu were already familiar to me from last year - the new options didn't sound like they had anything to do with any type of micro-dimming or auto-dimming.
It would be great if somebody could get to the bottom of all this - last year we were all very puzzled in the ES800 thread between auto-dimming/CE-Dimming and Micro-dimming, and ultimately the auto-dimming workaround was the best anybody could come up with.