CurtPalme.com Home Theater Forum

[JayAllan]

Register to remove this ad. It's free!

I am starting to pick up a few UHD disks. Mostly for the Dolby Atmos exclusives (like the upcoming Alita: Battle Angel for example) and I find that with my XBOX ONE I cannot effectively get the HDR image to look even halfway decent.

I have heard that the new Panasonic UB820 has really advanced HDR>SDR conversion. I am wondering how that would apply to the CRT world. Anyone have this player?

Do the CRT projectors have any more dynamic range than say a SDR flatscreen? Has anyone had any luck with UHD HDR dicks on their CRT?

I don't really care about 4k resolution. I am fine with my 1080p image on my Barco 909 but I really love Atmos and it would be great if there is any dynamic range boost I can get from this newer format.

[ElTopo]

Hi,

i use a Oppo203 in combination with a Fury.
The Oppo does a great job when it comes to HDR -> SDR conversion. Additional to that you can set the nits value within the Oppo.

UHD's look much better vs. the BluRay's.

Overall best blacks and dynamic image.




ElTopo

[JayAllan]

[ElTopo]

Attention when putting a scaler in the chain.

Not every device will do a good/correct tone mapping

[Tim in Phoenix]

Thirty-five years ago.........

VHS tape! Pretty cool huh? VidStar!!!!! I'll collect some movies eh?

Twenty-five years ago........ DVDs! Pretty cool huh? Don't have to REWIND a DVD! Oh crap, gotta buy all these movies again....... expensive.......

Fifteen years ago........ Toshiba HD DVD!!!!! Pretty cool huh? Nice picture. Takes twenty minutes to start the disc. I'll push Play and make dinner. There are only thirty movies out, I can deal with that........

Thirteen years ago....... HD DVD is dead but look----BluRay!!!!! Pretty cool huh? Oh crap, gotta buy all these movies again.......


I am not falling for the 4K ruse! .........but Oooooohhh!!!!!! It's so life-like!!!!!!! LOL

[kal]

Keep in mind that when CRT phosphor response was created (invented) many years ago it was done to meet the existing technology available at the time which was SDTV (Rec.601 gamut). Then HDTV (Rec.709 gamut) came along and it's extremely close to Rec.601:



CRT requires some colour filtering to get to Rec.601/Rec.709. Most better units are equipped with color corrected (filtered) red and green CRTs which achieve rec. 709 (HD) color coordinates, or they come very close. See this thread: http://www.curtpalme.com/forum/viewtopic.php?t=5604

So a well calibrated CRT projector should be able to be calibrated to Rec.601 (SDTV) and Rec.709 (HDTV). In some cases colour filters are required or clear c-elements need to be replaced with tinted c-element (same result). You reduce light output of course when doing this. This is required because most CRT projectors were originally manufactured with clear glycol or clear red and green c-elements in order to increase the overall light output of the projector as the original use for many of these projectors was not for home theater. People wanted light output, not colour accuracy.

Now fast forward to today and we have UHD (Rec.2020) gamut which is considerably larger and beyond the capacity of what CRT phosphors can deliver:



You can't (shouldn't) try and target CRT to do Rec.2020 colour gamut. I just won't happen. The phosphors simply cannot resolve those colours no matter what you do. You need to map that Rec.2020 space back to Rec.709. There may be some subtle improvements as ElTopo mentioned, but it won't be full range Rec.2020.

Kal

[kal]

Keep in mind that when CRT phosphor response was created (invented) many years ago it was done to meet the existing technology available at the time which was SDTV (Rec.601 gamut). Then HDTV (Rec.709 gamut) came along and it's extremely close to Rec.601:



CRT requires some colour filtering to get to Rec.601/Rec.709. Most better units are equipped with color corrected (filtered) red and green CRTs which achieve rec. 709 (HD) color coordinates, or they come very close. See this thread: http://www.curtpalme.com/forum/viewtopic.php?t=5604

So a well calibrated CRT projector should be able to be calibrated to Rec.601 (SDTV) and Rec.709 (HDTV). In some cases colour filters are required or clear c-elements need to be replaced with tinted c-element (same result). You reduce light output of course when doing this. This is required because most CRT projectors were originally manufactured with clear glycol or clear red and green c-elements in order to increase the overall light output of the projector as the original use for many of these projectors was not for home theater. People wanted light output, not colour accuracy.

Now fast forward to today and we have UHD (Rec.2020) gamut which is considerably larger and beyond the capacity of what CRT phosphors can deliver:



You can't (shouldn't) try and target CRT to do Rec.2020 colour gamut. I just won't happen. The phosphors simply cannot resolve those colours no matter what you do. You need to map that Rec.2020 space back to Rec.709. There may be some subtle improvements as ElTopo mentioned, but it won't be full range Rec.2020.

Kal

[kal]

[kal]

[km987654]

[HaydnG90]

If I remember correctly Bluray and HD-DVD were competing systems available contemporaneously, like VHS and betamax earlier. The market would only support one standard, knocking out the least popular (not necessarily the best) format. I chose poorly in both instances although I only bought 5 or 6 HD-DVD titles before I saw the writing on the wall. The HD-DVD load time was excruciating.
Aren't we forgetting laser discs

[Tim in Phoenix]