UK to Build Network of 150 Digital Cinemas

mikael writes "According to this article at the BBC, a network of 250 digital screens in 150 cinemas across the country is being planned. Each film is losslessly compressed from 1 Terabyte down to 100 Gigabytes and encrypted onto a portable hard disk drive with a key unique to each cinema, which is then delivered to the cinema. Each cinema projector will be capable of showing films at resolutions of 2048 x 1080 pixels. "The key benefit is the distribution and screening of documentaries, British and foreign language films, as making a digital copy is considerably cheaper than spending over £1500 pounds to make a copy of a single film". Other benefits include better picture quality and the ability to show more films each day." The UK Film Council has a brief overview of the project as well.

Comments

Digital vs. Film

[Orphaze]

Isn't 2048 x 1080 significantly less than regular movie film as far as resolution goes?

Re:Digital vs. Film

[badasscat]

If you shoot 35mm film, you get your negative, you cut the negative, you create a duplicate of the negative, then you create more duplicate negatives from that, then you finally create prints from those duplicate negatives. So by the time it gets to the cinema screen it's not unusual for a 35mm print to have gone through four or five _analogue_ copying stages from the original film negative.

Er, ignoring digital editing systems that cut at least one step out of that process, I'm not sure where you're getting "four or five" analogue copying stages even out of your own example.

"You get your negative" - this is the original film. "You cut your negative" - this is still the original film. "You create a duplicate of the negative" - ok, this is copy 1. "You create more duplicate negatives" - this is copy 2. You're not making copies of copies, you're making a bunch of copies from one original. "You finally create prints from those duplicate negatives" - this is copy 3. So, only three copies are made through the most laborious process possible - and digital editing systems cut one copy out of that.

Not to mention that film has been around for more than 100 years and so much R&D and technological advancement has gone into it over that time that the quality loss is really minimal through every stage. Sure, if you kept making copies of copies of copies of copies, eventually you'd see a real resolution difference from the original; but you won't in any commercial film.

As a result, the resolution of a final 35mm print is almost certainly substantially less than 2048x1080, whereas digital holds that resolution from start to finish (absent crappy compression schemes).

Different film stocks have different grain properties, and it's the size and distribution of the grains (the crystals) that hold the detail in analog film. Some film stocks have more than 3,000 crystals per inch, some have less. But all would be significantly and noticeably higher in resolution and detail than 2048x1080 digital resolution even after the production process was complete and all copies made.

I have seen several commercial films shot, edited and projected digitally - including Final Fantasy: The Spirits Within and the last Star Wars. They looked good - cleaner than film prints, surely - but there was noticeable and obvious (to me) pixelization and aliasing throughout the films. Most people probably wouldn't have noticed and/or cared, especially in the absence of the analog "noise" caused by film grain, but it was clear to me that either the projection system or the films themselves did not have the actual resolution of their film counterparts. I don't know what the resolution of the projection systems used in the US is, but I doubt it's much (if at all) lower than 2048x1080.

10:1 lossless video compression? I don't think so.

[mcg1969]

Subject says it all. There's something fishy about a feature film at 1080p24 compressed "losslessly" down to 100GB. That's 573GB (yes, bytes) per hour uncomrpessed, assuming 24 bits per pixel. Even D5 compression isn't lossless, and that's 5:1.

I doubt they mean truly lossless

[Kip Winger]

Converting even raw RGB video down to 1/10 the size, while leaving it lossless, is currently not possible using any compression known to man.

To get anywhere near that much, you have to at least convert it to the sum of cosines using Fast Fourier Transformation, which, since it distorts the data by converting it to not the exact amounts but the nearest amounts, is inherently lossy.

Any programmers in the UK want to start a lawsuit for false adverts?

Resolution

[Omnicrola]

Granted, that's a pretty high resolution by most people's standards, but take into account that it's being projected onto a 30 ft or larger screen, and it seems (to me) that it's not a high enough resolution.
Someone once mentioned to me that the frames that Pixar renders out for it's films are something on the order of 4000 x Something resolution, which sounds a bit more comperable to film.

Re:Now how long

[HawkinsD]

Presumably each file is digitally watermarked, so that rips could be identified as having originated in one particular projection booth.

So... what do you do, as a theater owner, knowing that your ass is personally on the line if pirate copies of your copy of the movie appear?

If it were my theater, I'd have the only key to the server room, which would be the only place that the hard drive would do any good.

Since the data has to flow from the server room to the projector when the movie is being shown, I'd enforce access logs on the server, so I could tell if the file had been read at times other than showtime.

But that still doesn't stop the $8/hour projectionist from installing a device that intercepts the data, copies it, and then passes it along to the projector.

Are there such things as video projectors that accept an encrypted stream of data?

better quality? i doubt it.

[DaveJay]

2048x1080 resolution is BETTER QUALITY than analog film? Not likely. They are likely referring to the absence of scratches and whatnot that build up over time, but I have a hard time believing that 2048x1080 projected on a large screen will not look pixelated.