Originally Posted by pottscb
I think the Sony s790 must be showing 0-256 as my Panasonic VT30 is hooked up to the other HDMI and it's showing the full pattern. I'm not sure how you're able to accurately set your brightness level without seeing below black, otherwise, you could be crushing black details and never know it.
Please re-read my other posts. You are misunderstanding how to set brightness.
You have to set brightness so that black (level 16 for video content) is black and level 17 (which is just above black) just barely shows.
Not seeing blacker than black doesn't mean that you are crushing black details. There are no black details that should be visible below black. You are crushing black details if levels 17 and above show black instead of just above black.
So you do not need to show blacker than black to set brightness properly. You simply adjust brightness until level 17 just shows. Another way to do it is to show a black pattern, and lower brightness until it doesn't seem to produce any change. Then you go up one click at a time, until it starts showing a change and the black floor is raised, and then one click back down. It's better not to resolve 17 than to raise your black floor. There are also controls in the JVC which allow you to adjust brightness with more granularity if brightness forces you to slightly crush black or raise the black floor (I think they are called black level, I never had to use them so I forgot about them).
If your S790 is set to display 0-255 (which isn't necessary unless it crushes blacks or whites in standard mode), you need to adjust brightness to something like -7 and contrast so something around +7 (if you want to resolve all the way up to 255, as per THX generic recommendation, but unless you have a lot of brightness to spare you are really hurting the peak brightness of the PJ as well as its on/off contrast, so I would suggest resolving up to 240 which should be a round +10 or even going down to 235 which should be around +14 )for the contrast setting).
You need to read more on the subject if this is still not clear for you. Being able to see blacker than black is not necessary to adjust brightness in such a way that it doesn't crush blacks. If you are in standard mode, you won't see blacker than black, and as long as you can resolve level 17 or 18 it's not an issue at all.Edited by Manni01 - 12/29/13 at 3:17am