Saturday, 24 February 2018

1080P Blu-Ray vs. 4K UHD Blu-Ray: "The Prestige" - Modern 35mm Filmmaking


I love this movie! It was one of those flicks I walked into with no expectations and came out realizing that I just had to grab the video for the home movie collection...

At its heart, The Prestige (2006) is a drama with sci-fi/fantasy elements based on the 1995 novel by Christopher Priest which was nominated for the Arthur C. Clarke Award and won the World Fantasy Award in 1996. I know that the fantastical elements may be a turn-off for some, but given the historical mystique of a character like Nikola Tesla, I was willing to suspend belief to enjoy the themes of ambition, sacrifice, and redemption.

Technically, like the movie we looked at last time (Blade Runner: Final Cut), this movie was filmed in 35mm anamorphic primarily using Panavision's Panaflex camera with Kodak film. It was created more than 20 years after Blade Runner. While visual effects were rendered in 2K, the Digital Intermediate was done in 4K. Just like others in the recently-released Christopher Nolan 4K Collection, this film was advertised as "remastered by the director in a stunning new format". 

So... The question is, does a more "modern" 35mm movie benefit resolution-wise from a 4K release?


The UHD Blu-Ray video is encoded at an excellent average bitrate of ~55Mbps as 10-bit H.265/HEVC with HDR10, while the standard 1080P Blu-Ray has a video bitrate of 23Mbps encoded in H.264/AVC - not bad at all and certainly an upgrade compared to last week's <20Mbps VC-1 codec Blade Runner.

As usual, here are the prerequisite madVR settings used for conversion of HDR to SDR and also upscaling parameters using high quality NGU algorithm:




I scanned through the movie and picked out a few scenes that looked interesting or appeared to be of good quality for a still-image comparison. Remember that since this is a drama set mostly in Victorian-era London, much of it appears a bit dark and dreary. As you see, many of the screenshots consist of close-ups of the main characters...

As usual, to really appreciate the comparisons, make sure to click on the image to show the 1:1 shot - best viewed on a 4K monitor of course.

1. Jess (00:01:17.166)




Notice the color differences between the original Blu-Ray disk released in 2007 and the new UHD Blu-Ray released in late 2017 - a convenient 10-year span with improved encoding technology. The new disk is "warmer" with higher contrast. We see this across the whole movie.

As you can see, the detail in the hair and eye lashes actually look the same between the 2K/1080P and 4K/2160P versions.


2. Borden (00:26:35.136)




Notice the white in the background has been "colored" with a more yellowish, warmer tone. Unlike Blade Runner, film grain and noise are relatively equivalent across the two versions through most of this movie.


3. Angier (00:46:30.607)




In this scene, perhaps the stronger contrast in the 4K HDR has accentuated the film grain a bit. Notice the fine pattern of the suit is about the same in both versions... No extra detail to be found in facial stubble and wrinkles.


4. Bowie Tesla (01:03:29.625)

I could not resist including a shot of David Bowie here as Tesla himself :-).

Bowie's anisochoria is easy to see in this scene (his left pupil is permanently dilated, supposedly the result of a fight with his buddy George Underwood back in 1962).



Alas, not the sharpest scene but the HDR color/contrast remastering brightens up the image and makes it less "cold".


5. Olivia (01:05:10.000)

Miss Scarlett Johansson as Olivia, the magician's assistant...



In the 2017 UHD Blu-Ray release, it looks like they fixed that whitish fleck of dust (?) you can see in the upper left of that crop near her hair in the 1080P version. Little things like this to repair imperfections were done. Again, a warmer color tone, bit better contrast.

Not much if any spatial resolution improvement given that the 4K image has 4x more pixels encoded for each frame!


6. Prison (01:54:23.464)




Ditto. Same detail in the brick wall, that iron pipe thing, metal chains...


7. Cutter's Workshop (2:04:00.214)

Michael Caine plays Cutter, the "ingĂ©nieur" with this scene in his workshop, all kinds of doohickeys around.



Lots of potential little details like the drapes, wood grain, metal paper tray, glass bottles, etc. to compare between the two versions. Maybe the focus was a little soft, but I would have thought there'd still be something of significance between the two images in terms of extra detail present! I don't really see any notable worthwhile improvement.


Impressions...

While the color and contrast differences may be an improvement, notice that there was no major upgrade to the sharpness or resolution of the image! Remember, the 4K image provides four times the number of pixels; obviously it's not being utilized.

Yet again, I am having great difficulty seeing differences between standard 2K/1080P and 4K/2160P when examining movies that originated as 35mm film. While I keep hearing that "analogue is better than digital" in the film world just like people for years talk about a similar comparison in the audio world, I dunno guys, I have yet to be impressed. Surely this 2006 with a $50M budget, big name actors, and high quality remastering supposedly supervised by the director who has been outspoken about image quality should be able to show off significant improvements in resolution if there were any from the final "cut". Alas, no such luck.

Looking around, some of the UHD Blu-Ray review sites are giving the image quality here 5/5 yet again ("the film arrives on this 2160p, HEVC/H.265-encoded UHD in a presentation that can truly be said to 'blow away' the previous Blu-ray master"). Another review gives the image quality 4/5 claiming:
"Naturally, overall clarity and definition receive a welcomed uptick, revealing a bit more info in the background, such as when characters walk through the streets and neighborhoods of Victorian London. Not only can we count the bricks of buildings outside and clearly see the exposed wooden laths behind the crumbling plaster, but we can distinctly make out the stitching and threading of the fabric used for the costumes. Faces are often lifelike, showing individual pores and the smallest, negligible blemish."
Well, I beg to differ as I am obviously not seeing all those wonderful differentiating characteristics compared to a fine 1080P upscale. In my opinion, this is 3/5 video quality - decent 2K-level HD resolution obviously from an analog film source but clearly not "Ultra" HD, fine for the material without much distracting noise/grain and improved color compared with the Blu-Ray released a decade ago. Significantly inferior to the best 4K video I've seen in any event.

Personally, while I liked the improvement in contrast and the overall warmer tone of the HDR remaster, I think this movie reminds us again that 35mm film, in practice is not "true 4K" in terms of achievable resolution. In fact, from what I have seen not just here, but with Blade Runner and even the 35mm scenes in Interstellar, the quality falls far short of full 4K potential. If there is indeed any resolution to be gained, it looks like the studio will need to work harder to show us where! Other than maybe really fine film grain, a standard 1080P Blu-Ray appears to be easily good enough for 35mm film resolution-wise.

Specifically, for a character-driven movie like The Prestige, with few special effects (other than Tesla's electrical discharges), there is actually no need for HDR since the colors are rather drab, and the lighting is typically dim and overcast. And without evidence of resolution improvement, I don't see a particular need to get this one on UHD Blu-Ray either. Like with Blade Runner, a standard Blu-Ray version using the remastered color/contrast levels would look excellent if they released such a version.

You might be thinking at this point... Other than Dunkirk (compared last month), is there any other movie that actually benefits from the 4K UHD Blu Ray?! Of course there is. I'll show you one next time :-).

Until then, have a great week ahead... Enjoy the sights and sounds!

13 comments:

  1. I did a little comparison myself of two 35mm 4k mastered movies, Independence Day and Terminator 2. Both movies had a Blu-ray release before.

    For Independence Day I compared the old 1080p disk to the new 2160p disk. I also reencoded a scene from the new disk to 1080p to see what difference that makes.

    For Terminator 2 I compared the old 1080p disk to the new 1080p and 2160p versions.

    As expected, the remastering of the movie makes a big difference in both cases, the resolution is pretty much irrelevant. There is a little bit of quality loss for the downconverted Independence Day due to my recompression of the video. But the difference to the UHD version is still much smaller than to the old Blu-ray.

    Here you can see for yourself: https://photos.app.goo.gl/OHC2od2fEp5kjD2e2

    ReplyDelete
    Replies
    1. Great job Lugu. I had a look at the images just now.

      Indeed we're seeing just like with audio once we've reached or are reaching the limits of physical limitations for our purpose (whether it's 2-channel sound or filling a screen of target size). It's the mastering that makes the most difference, not the resolution any more.

      Again, 35mm film isn't a particularly great source to use up what's available with 4K digital resolution...

      Delete
  2. Great work as usual, Archimago. Would be interesting to go into the reasons why a lot of reviewers have better opinions about 4K versions than you:) And I am talking about the image details, not HDR obviously. Perhaps, scalers in 4K players are not good? But that needs to be investigated.

    I'd like to mention another thing,important to movie experience IMO, - the overall quality of most of the movie, not just the best quality parts. And the worst quality parts are very important too, those could kill the movie experience. Thus, if 1% of the movie frames shows an improvement, but 99% does not, the overall impression would be roughly the same, right?

    For example, some parts of 4K Blade Runner are horribly noisy and lacking shadow detail, with effective resolution probably lower than the DVD standard. It would be good to show that.

    ReplyDelete
    Replies
    1. some examples of what people see on their TVs:
      https://www.avforums.com/threads/blade-runner-the-final-cut-ultra-hd-blu-ray-review-comments.2120676/page-7#post-25496727

      Delete
    2. and another one:
      http://forum.blu-ray.com/showpost.php?p=14037817&postcount=1214

      Delete
    3. btw., it is easy to create 8K screenshots from MadVR. (From MadVR settings go to rendering_>screenshots and select "create screenshots with custom zoom factor", specify it 200% for UHD and 400% for HD, specify NGU Sharp in scaling. then at any moment click Alt-I to save the image, or click right mouse button -> File -> save image.)

      I think the comparison of UHD BD to HD BD in this case would be more fair, and it would explore the end potential of the formats better. Doing this to UHD (and HD too) would be akin to appreciating an uptick in quality for an SD DVD image properly upscaled on a 1080p monitor. I believe that upscaling DVDs for 1080p monitors was found quite beneficial when suitable hardware appeared in early 2000s.

      Delete
  3. "As usual, here are the prerequisite madVR settings used for conversion of HDR to SDR and also upscaling parameters using high quality NGU algorithm:"

    I feel you should be comparing like for like, at least to show the difference. That is, show raw screenshot comparisons between the regular BD edition and the UHD BD, rather than madVR version of the regular BD or its HDR-to-SDR conversion. This makes it ambiguous whether you are really just comparing how madVR looks in its upscaling software or if the regular BD really does have that much detail.

    ReplyDelete
    Replies
    1. Hi Stalepie,
      Alas I think it's inevitable that there will be decisions made to try to finesse BD and UHD BD to make them comparable side-by-side. The madVR settings just allows me to use a high quality scaler so I can show off essentially the "best" of what BD could look with the hopes that upscaling 4K players and TV's will achieve similar quality. Sure, it would not be hard to just output the "raw" 1080P as well but then if I want to compare side-by-side, I think it's so much easier to just upscale to 4K here.

      Likewise, HDR-to-SDR is necessary to make the HDR BT.2020 image look at least comparable in color tone and similar to what one would see on a real HDR screen. Otherwise the contrast and tonality would be very much off and essentially impossible to compare the two. At least this way one can get a sense of some of the color differences while looking for major resolution variation.

      Not perfect, but I think it'll provide a good starting point for comparisons. This goes for Yuri's suggestion for 8K as well... Yes, it can be done, but let's just finish off these comparisons in the series in what I think are reasonable compromises.

      Delete
  4. I tried to find an e-mail I could contact you, didn't find one, so I decided to submit my question as a comment.

    I am considering the new Paradigm Persona, and I'm wondering if you have an opinion about the 3Fs + subwoofer combination. I know your system is built around Paradigm's previous generation top speakers... so I assume you're interested in the new ones.

    Any thoughts on this would be appreciated.

    Thank you,
    Gabriel

    ReplyDelete
    Replies
    1. Hi Gabriel,
      Yeah, I'd certainly be very interested in hearing the Persona. Unfortunately, I have not had the opportunity to yet at this point. I have not come across a local dealer with the speakers on display!

      I'll keep looking when I visit different places though...

      Delete
  5. Hey Archimago! Love your blog. I'd been following UHD craze and I think your conclusions may be a bit hasty about 35mm.

    Some others have noted that Nolan shoots his 35mm oddly soft, for some odd reason. The anamorphic lenses are to blame, I suppose. But there definitely are 35mm-derived released that looked good at 1080p that look better when presented in 4K. Mainly, Sony's catalogue releases look excellent. Also, there are some other good cases where we get pin-sharp results like the releases of Gladiator, the first two Harry Potter films (received 4k rescans, unlike Azkaban and after), the Matrix (also wildly-different color timing).

    This French website here is actually has a great method of comparing two releases with sliders: http://www.hdnumerique.com/dossiers

    http://www.hdnumerique.com/dossiers/700-test-4k-ultra-hd-blu-ray-gladiator-master-4k.html
    http://www.hdnumerique.com/dossiers/705-test-4k-ultra-hd-blu-ray-matrix-master-4k.html

    There still is a bunch of hubba about whether a studio "blows" a release or not. For example, the Matrix one people are saying looks excellent -- on the UHD only. Because, while the 4k master is used for the standard Blu-ray, its HDR to SDR conversion was done *terribly*!

    ReplyDelete
  6. I'm surprised they changed the look of the original's green tone. That was important to the look of the film, very distinctive. (Remember the falling green code lines? The whole movie looked green, but I thought it was supposed to...)

    ReplyDelete