Originally Posted by xpl0sive
Thanks for this, although I'm a bit more confused now lol.
I thought the benefit of the 820 was it's ability to play HDR as per usual, but with the optimizer turned on.
So what would produce the best picture for 4K UHD discs:
a) calibrating in HDR/2020, Digital Cinema colour space, 'auto' dynamic range and HDR optimizer set to 'ON' on the 820
b) Doing a CMS calibration for Harpervision (and tweaking the rest slightly to suit my room)
c) calibrating in SDR/2020 on the 820, Digital Cinema colour space, 'auto' dynamic range and HDR optimizer set to 'ON'.
HDR is just a monkier for content that is mastered with a greater range of brightness than an SDR image. However, almost every consumer projector on the market can't do anywhere near HDR's standard range of brightness. Therefore, projectors heavily rely on tone mapping which essentially takes HDR and converts it to SDR (and even more so when running wide color gamut with the digital cinema color filter). Manufacturers just call these projector HDR capable because they contain a tone mapper.
So a review of your 3 options are:
A) The Panny 820 first tone maps to HDR (500, 1000, 1500 nits) based on your player's settings. The projector then maps that HDR to SDR with Epson's internal algorithms. Some people like this, especially if they give up the full wide gamut color filter and run bright cinema for some extra lumes.
B) The Panny 820 first tone maps HDR to HDR at 1000nits based on the disks static meta data. HarperVison then tone maps that HDR to SDR mostly via a custom gamma and tricks the projector into using it's standard SDR algorithm to display the picture. This is a true hybrid approch and the one I personally use most of the time.
C) The Panny 820 tone maps HDR to SDR2020 using static meta data on the disk plus your HDR brightness slider setting (which according to Kris' comment in the other post I linked) can be set to your display's actual light output and be tweaked to taste. The projector doesn't have to tone map as it receives a native SDR signal. This is the only method that tone maps just once. And Panny's tone mapping algorithm is as good as industry tone mapping hardware solutions that cost thousands of dollars. This is why I believe if calibrated correctly this method could display the most accurate projected picture.
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