Originally Posted by Dave Harper
I also believe it was 12GAGE that found that with a full 100% white pattern it didn’t projector it’s peak white capability for whatever reason. Most likely due to how Automatic Power Control works in the 970. People really need to factor that feature in when setting up, calibrating and using these. Nobody really knows exactly how it works and what it precisely does in almost all scene cases. Whatever it is, my belief is that’s what makes the image perception of these belie their numbers. I think it makes the projector have some sort of a floating power output scale based on scene APL and other factors, differently than just a dynamic iris and gamma manipulation alone. I think that’s why my settings can be superior to HDR to SDR Tone mapping due to some factor of this that’s involved that normal testing with regular test patterns doesn’t show. Once you play with these long enough you learn their quirks, limits, strengths and characteristics so you can then massage the projector to give you the amazing image that you want and need.
Regarding the 990, it does not differ in how it displays peak white based on what is on the screen. I have tested this very thing at length and actually measured it. When you display ADL patterns there are tiny white boxes, which are nowhere near full field. The projector displays these tiny white boxes at the same nits level as a full field.
All these boxes were the same brightness... I measured them all. If its not going to display its maximum peak white with only a 1% ADL white box, then it never will in any useful circumstance.
I even tested this with white boxes 1/4 the size of 1% ADL below, I did this while I was trying to find when the dimming works, and what the max dimming was, and when it stops working, and when it clips white if the white box is small enough (which it does), I did this with a meter over the box and alternating between white and the opposite image.
I will tell you one interesting fact, dimming does seem to differ depending on WHERE the white is in the frame, I sometimes got different levels of background dimming when the box was in the middle vs on the outside, but in all cases, white measured the same in full field as it did in the little boxes except when dimming was at its maximum obviously, it never measured greater.
I dont know what the 970 does, but I know Kris will actually measure this the same way I did, not by plugging in a voltage meter into the wall and watching power draw.
please point me to this post about the power draw with your measurements. Thanks.
You need to measure this thing with real white patterns at various ADL's. I even did this in HDR mode, no difference.
Once you play with these long enough you learn their quirks, limits, strengths and characteristics so you can then massage the projector to give you the amazing image that you want and need.
Is almost 50 hours of doing nothing
BUT this sort of stuff enough time? Because if you cannot figure out a display 100% in that length of time you are no good.