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#5344 |
Blu-ray Knight
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the problem with digital editing, especially at 2K, is that you're throwing away a huge amount of picture information. Not just resolution, but also highlight and lowlight detail. 4K DI at least is a huge improvement, but still limited.
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#5348 | |
Blu-ray Samurai
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(i.e. SDTV has Rec 609, HDTV has Rec 709, UHDTV has Rec 2020 and HDR). However, the main point is that resolution does not equal dynamic range. You could have a 4K video file with 609 color space and a 720x480 image with Rec 2020 color space, if you wished to. |
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#5349 |
Senior Member
Oct 2007
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Several companies have published a document on HDR at the recent HEVC meeting. It lists several consumer displays that have been tested with HDR video and links to a document on the BDA website for Ultra HD Blu-ray. I think this is the first detailed document from the BDA on how HEVC video will be encoded for Ultra HD Blu-ray.
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#5350 |
Retired Hollywood Insider
Apr 2007
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#5351 | |
Retired Hollywood Insider
Apr 2007
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![]() I can just envision bloggers from other home theater sites struggling with trying to figure out how to reword/rework some of the technical info from the links which you’ve supplied….and do it all in a fashion where it isn’t excruciatingly obvious that they read it here first….in order for them not to give the Tech forum of Blu-ray.com due credit. Believe me, this thread didn't blast thru the 1,000,000 viewership mark solely due to Blu-ray.com membership readers or football/soccer fanatics. ![]() |
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#5353 | |
Retired Hollywood Insider
Apr 2007
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When I get a little more time to write, perhaps I’ll elaborate on the details of what this statement…“The movie was finished in 4K, including all of the visual effects.” ( http://www.hollywoodreporter.com/beh...ad-bird-800597 ), really meant/involved, technically, and which was not covered in this other fine article about the Tomorrowland movie making - http://www.artofvfx.com/?p=12138 . Because to resolution purists interested in the workflow(s) of all the vfx shots, that visual effects comment in THR may need a little clarification. Last edited by Penton-Man; 06-22-2015 at 05:23 PM. Reason: added the phrase 'in THR' |
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#5354 | |
Retired Hollywood Insider
Apr 2007
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Plus, yous gets real world behind the scenes Hollywood tidbits from time to time. ![]() |
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#5355 | |
Retired Hollywood Insider
Apr 2007
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Although, for some shots, the elements were built in 2K, then up-rezed to 4K and then output to 4K. Begs the question…Which shots and how was it determined whether to do an up-rez phase rather than a ‘pure’ 4K process all the way through to final output? Well, shots with motion or those that were dark had their elements built in 2K and up-rezed to 4K because side-by-side testing with observers sitting very close to a big screen determined that viewers couldn’t tell the difference with such fast motion or light deprived shots. So, to the original comment in The Hollywood Reporter, yes, the movie was finished in 4K, including all the visual elements….but some had a pure 4K process all the way through; whereas others were up-rezed and output in 4K……which is not necessarily a bad thing….and very practical. |
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#5357 |
Retired Hollywood Insider
Apr 2007
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Follow-up from last February - https://forum.blu-ray.com/showthread...n#post10446921 , which, by the way, since the time of that post, the studio finally updated the Tech specs to now list it as having undergone a 4K
![]() So, on to the specs of 4K DCP for Magic Mike XXL Image Format: 4096x1716 (Scope) Audio Format: 5.1 Feature Run Time: 1:55:06 File Size: 170.5 GB |
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#5358 | |
Retired Hollywood Insider
Apr 2007
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#5360 |
Senior Member
Oct 2007
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After looking over the proposals at the current HEVC meeting there does seem to be two issues with SMPTE 2084 HDR. The first is that the combination of SMPTE 2084 HDR and 4:2:0 chroma subsampling causes blockiness in some HDR video. Preprocessing of the video can help to reduce that blockiness. The second issue is that SMPTE 2084 is good at capturing noise which can cause a large increase in bit rate. Noise reduction of the video will likely be common with SMPTE 2084 HDR since it would keep the bit rate reasonable. Since the two issues can mostly be worked around with video preprocessing it seems like most of the companies are okay with it.
The Movielabs HDR workflow document looks like it was written as a defense of SMPTE 2084 HDR but gives a good explanation on dynamic range and noise. |
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