Originally Posted by Dreamliner
Calibrated Gamma D is basically a super shiny turd... Once you see what a 4K disc looks like on a UB820 in SDR2020 with Gamma 2.4 & BT2020 Color Profile, you'll be blown away and will never ever return to Gamma D. You will seriously think you bought a new projector.
Thanks for the advice, friend, but I don't think you read my post completely
I don't use Gamma D, it's just a fly that I have to swat away constantly when I watch HDR content. I don't need to load custom curves, my PJ has a custom calibrated EOTF set by Gregg Loewen. Occasionally I look at Gamma D just to laugh at how dark and murky it looks then I swap to the custom Gamma and marvel at how much better it looks!
To be clear, my ONLY real issues with HDR are (1) the annoyance of having to grab the remote and push the "Gamma" button every time it falls back to Gamma D and (2) the fan noise in high lamp mode.
So while a UB820 may still be a good choice, it's not because of Gamma D. The only problem with Gamma D is that it keeps rearing its head and I have to switch it back to my custom calibrated HDR Gamma. Both the HDFury (by stripping the HDR flag) and the UB820 (by outputting SDR.2020) would allow me to avoid Gamma D completely, since the PJ would never see an HDR flag.
With the UB820 & SDR2020 your projector is already using the full range and isn't leaving any brightness or color "on the table." For example, "100% white" is the exact same thing whether you are in HDR or SDR, HD or 4K.
Hmm, I'm not following this part. Maybe I'm not understanding...
Let's say I have it calibrated so my SDR picture mode maxes out at 14ftL (low lamp mode, iris stopped down), but my HDR picture mode gets over 20ftL (high lamp, iris wide open). If I have the UB820 tone map the HDR to SDR output, and then watch with my SDR picture settings (but switching REC709 color profile for BT.2020) wouldn't I max out at 14ftL vs. the 20+ that I was getting with my HDR mode? So aren't I "leaving brightness on the table" so to speak?
Basically, for the purposes of this discussion I have two calibrated picture modes (there's also a third "bright room TV" mode Gregg set up but not relevant to this):
- An SDR mode with REC709 color gamut and 2.4 Gamma
- An HDR mode with BT.2020 color gamut and an HDR EOTF custom Gamma
Am I correct in understanding that if I had a UB820 outputting SDR.2020 that I'd basically want to set up a 3rd custom picture mode which sort of mixes the two, combining the calibrated SDR Gamma (2.4) with the BT.2020 color profile?
Basically, the UB820 will make your 4K Blu-ray discs behave exactly like HD Blu-ray discs, just with more color and resolution. You will be very happy, I promise.
Interesting.... I've heard nothing but praise for the UB820!
I've heard some people having trouble with HDR content on the ATV as it would resend some signal to the projector frequently retripping the Gamma D switch and this would happen several times during regular playback. The only work around I've heard for this is the HD Fury products. If you are just watching HD you probably haven't noticed this and if you watch HDR on the ATV, you must be one of the lucky ones.
I have my ATV4K set to output 4K/60p SDR at all times. Then I never have to deal with black-out HDMI resyncs or Gamma D at all. Frankly the ATV4K has really fabulous PQ with everything I've used it for (loads better than my older 1080p Roku) and the only thing I'm missing out on from what I can tell is the wider color gamut on streamed HDR titles. Unfortunately as far as I can tell there's no way to stream from Vudu or Netflix with SDR.2020, I'm assuming it requests the SDR stream with 8-bit REC709 color rather than the HDR stream with BT.2020 from the source.
Anyway, appreciate the awesome feedback from everyone! This is a great discussion and I'm learning a lot. Unfortunately I'm still wavering between the two options!