For practical purposes, there is not much difference with HDR10 and DV for the end user. Both are PQ based HDR. Both support dynamic metadata (scene by scene) but I doubt the show was graded that way. The show is probably graded for 1000 nits PQ with 600 nits tone mapped.
DQS
On Sep 13, 2021, at 2:30 AM, John Moore <bigfish@pacbell.net> wrote:
[Edited Message Follows]
I have a 55 inch LG OLED C9 that has been professionally caibrated for SDR and HDR. I recently discovered that I have an Amazon Prime account, long story, and with it comes Prime Video. I watched the Jack Ryan series and season one was a full UHD raster with DolbyVision and Dolby Atmos. When I went to watch season 2 I found it to be HDR according to the LG which I think means it's HDR 10. I've done some googling and found out the LG apparently doesn't support HDR 10+ which has dynamic metadata. Season 1 looked great but season two looks like it was mastered in True 4K 4096x2160 and then letterboxed to fit. Oddly I have a piece of tape marking where the letterbox is when I have done my 4K shows that were shot 4096x2160 and the letterbox on Jack Ryan season 2 has more black on the top and bottom than where I have my tape. Not a big deal but something I noticed. What really stands out is the color grade looks off often times in not so subtle ways. Many exterior scenes look too blue. and many interior scenes seem to be a bit washed out. If HDR 10+ is still only scene by scene and HDR 10 is one static metadata for the whole show it doesn't explain why I see things like in the interior scenes one angle will look washed out compared to the cross angle. If it's being displayed in HDR 10, which is what LG supports it's not the metadata changing between angles. I'm not sure if a program is HDR 10+ and displayed on and HDR 10 only LG monitor what happens. Does the LG get the main static metadata and respond to it correctly but then ignores the scene by scene dynamic metadata?I'm wondering why season one was DolbyVision and season 2 shifted to HDR10 or perhaps HDR 10+. Now that I've learned the LGs don't support HDR 10+ I'm wondering how much that factors in to what I'm seeing. I know DolbyVision dynamic metadata can be shot by shot with the DolbyVision trim pass. I'm trying to remember if HDR 10+ is just scene by scene or does it offer shot by shot?After googling I found Samsung TVs don't support DolbyVision but they do support HDR 10+. When using my LG to look at HDR from my edit system it doesn't matter during color correction for the HDR grade but it makes me wonder what people are doing to deliver HDR 10+ content. I'm somewhat familiar with the DolbyVision side of Resolve and the trim XML but it sounds like I would have no way to judge HDR 10+ dynamic metadata with my LG monitor.Everything seems to point to DolbyVision as a more robust workflow to get the right image to the consumer but HDR 10 and 10+ seem to more universally compatible. I also learned the the Dolby Chip for DolbyVision metadata tone mapping is no longer required in all DolbyVision TVs and that Sony is doing the DolbyVision tone mapping using software. I'm not sure what the actual difference between a chip doing it and software but that's something I found in my research.I know HDR is still the wild west on a certain level but I had no idea that in the US it's almost impossible to find a TV that handles HDR 10, HDR 10+ and DolbyVision. I'm really shocked that the LG OLEDs don't handle HDR 10+. Another thing that I find surprising is how blue and off the LG OLEDs come out of the factory. I have a C6 and a C9 and they are both blue. At least from C7 or C8 they have the chip to let Calman Calibration software apply an internal LUT to get the TVs looking decent.Has anybody watched the Jack Ryan series season 1 vs season 2. I'd be curious why season two is not DolbyVision and what was the logic in switching.John Moore Barking Trout Productions Studio City, CA bigfish@pacbell.net
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