Originally Posted by Al Leong
Am I correct that Custom is not tone mapping metadata but clipping?
So this part of the video is unclear. It sounds like Philip is talking about the z9d only here, since he makes that comment shortly after saying the z9 is their "prosumer display". He also makes reference to this behavior in Custom mode coming in a "future update".
Maybe the "future update" is baked into the A1E firmware.
You can probably check for yourself though with a few simple tests, and have a few options.
Option 1 - Go to this site ( http://rmadvancedcaldisc.com/rm-uhdhdr-10.html
) and buy R Masciola UHD test patterns. The clipping patterns arent in the free demo download so this will cost you $25. (related AVS thread: https://www.avsforum.com/forum/139-di...-patterns.html
After you downlaod the patterns go into the mp4 files folder ( 02. MP4 Files\01. Basic Setup Patterns\05. White Clipping ) and copy "01 White clipping 1 HDR10.mp4" onto a usb stick. Put it in the TV and play with built in TV Video player or whatever android video player you prefer.
You'll see a ramp of boxes of increasing intensity, labeled with RGB brightness value and some with nits value (100, 400, 1000, etc).
You can see whether the TV is tone mapping or clipping by noticing which boxes are flashing in the pattern. If custom is clipping, the last box that should flash would be around 600-700nits or so. If the one just to the left of 1000 is clipping you're definitely in tone mapping mode.
You mentioned you have a lot of UHD bluray. Apparently Sony UHD bluray have a hidden calibrations patterns menu. I dont have this personally but found instructions on the internet, it looks like it will work the same as Option 1 for you.
"Go to scenes and enter 7669 to start the test pattern. Towards the end there are three grayscale step/ramp patterns. You will use the first two, the second has steps from 100-1000 nits." (source: https://www.avsforum.com/forum/139-di...l#post46213257
It sounds like that second pattern is the one you want and will be similar to the R Masicor pattern I mentioned above.
Now, when looking at this, also understand that the contrast control can have an impact on the clipping behavior. For example, on the z9 Cinema Home Contrast 95 == Cinema Pro Contrast 86 in terms of grayscale response in HDR. I wouldnt be surprised if A1E operated similarly.
Without a meter it will be hard to really do much in terms of modifying grayscale response, but if you aren't getting flashing up to 1000 (in a tone mapping mode), try reducing contrast to see if you can get there to ensure you are not clipping content. Don't reduce contrast too much though as it reduces the brightness of almost the entire curve and you may end up with too dark of a picture if you have to drop contrast too much.
Thats about as far as you can get without a meter, if you really want to nerd out on it you can get an xrite i1 display pro for around $200 on amazon. That meter is very high performing and would help you get the most out of your set (along w/ free software like HCFR) but it would also be a bit of a time commitment so unless you are into it for the hobby and the need to get that last 5% out of your display doing the above is probably good enough.
I hope that helps