Solved: How is this possible?

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foler59

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Can somebody tell me how it is possible to have a movie filmed then released in DVD and then after 10+ years be re-released in Blue ray disc with twice the original (DVD) size? I mean when they do the original filming, where is the data stored? Is it stored in some form of analog media? Cause if not, then it can't make sense, because you can't "produce" more bytes (or more pixels) out of a certain amount of bytes (stored in the DVD). Except if all that extra bytes are special effects, and not actual information captured at the time of the filming. And in this particular case, all extra bytes can be reproduced in anyone's PC, from the DVD-9 version of the movie.

So what's the case anyway?
 

fairnooks

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Its called remastering, you're right, its not possible to get any better than the source which on an older movie is some form of film most likely. Who's to say that DVD-quality was the best quality possible though eh? So there may indeed be information in the original capable of producing a quality higher than that of DVD especially if a really good job of remastering is done ("cleaning" the film and applying enhancing filters) even though it can't really be true 1080P by definition.
 

foler59

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So older films are filmed in some analog tape of some sort and modern ones are filmed directly digitally?
 

cwwozniak

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So older films are filmed in some analog tape of some sort ... ?
Many "older" films are on actual 16 mm and 35 mm wide film. The actual pixel resolution will depend on the chemistry of the emulsion on the film. Each frame can then be digitized at any needed resolution to make a standard DVD or high definition DVD.
 

fairnooks

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Some, and increasingly more video is shot straight to digital but there is still a lot of analog film because many directors prefer the "look" of film and the quality is so good its easy to master high definition digital video from it with room to spare. I included an exerpt from wikipeadia to give you an idea about resolutions and why film could be around for some time to come yet.

From wikipeadia:"The cinema now faces a new challenge from home video by the likes of a new DVD format Blu-ray, which can provide full HD 1080p video playback at near cinema quality. Video formats are gradually catching up with the resolutions and quality that film offers, 1080p in Blu-ray offers a pixel resolution of 1920×1080 a leap from the DVD offering of 720×480 and the paltry 330×480 offered by the first home video standard VHS. The maximum resolutions that film currently offers are 2485×2970 or 1420×3390, UHD, a future digital video format, will offer a massive resolution of 7680×4320, surpassing all current film resolutions. The only viable competitor to these new innovations is IMAX which can play film content at an extreme 10000×7000 resolution."
 

foler59

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1) So the reason they still use films is because their capacity can be further exploited later, when they can make digital video out of it with more pixels?

2) Wouldn't a theoretically perfect film offer infinite resolution? How can they measure the rsolution each film offers?

3) Compressing a DVD9 to a DVD5 with (say) dvd shrink, will produce pretty much the same quality. Would compressing a blu ray disc movie to the size of a DVD9 offer better quality than that which is sold directly to DVD9?
 

cwwozniak

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1) So the reason they still use films is because their capacity can be further exploited later, when they can make digital video out of it with more pixels?
That could be one reason. It may also be possible that some producers and/or directors may just prefer to work with film.

2) Wouldn't a theoretically perfect film offer infinite resolution? How can they measure the rsolution each film offers?
In theory a perfect film would have infinite resolution that could only be limited by any aberrations in the lenses of the optical path used to get the images on the film. In practice, a film emulsion uses finite sized grains that can each capture one "pixel" of the picture. The size of the grains affects the speed or light capturing ability of the film. Generally, the faster the film, the larger the grains.

I found an interesting article in PDF format at the Stanford University web site that discusses film grain and resolution as well as touching on scanner technologies used to digitize filmed images.

Film Grain, Resolution and Fundamental Film Particles
Tim Vitale, April 2007
http://aic.stanford.edu/sg/emg/library/pdf/vitale/2007-04-vitale-filmgrain_resolution.pdf
 
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"which can provide full HD 1080p video playback at near cinema quality"

...with people kicking the back of your seat. :)
 
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