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VIDEO - digital contra analogic (fisier contra pelicula)
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MesajScris: 12 Mai 2016, 11:25 
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How does 4k cinema compare to 70mm film?

In a practical sense, this question doesn't matter. This is because 70mm is going to go away as is all film for full length movies. They simply cost too much to produce, print and distribute. a two-hour movie, in 3D, will cost about $60,000 to make a single print on 70mm film. The cost is double that of a 2D movie, because two prints are needed for 3D, one for each eye. This is compared to virtually zero cost to make a distributable copy of a digital film, and there is no extra cost for a 3D movie in digital.

Next, consider the production costs for 70mm film. The cameras are very large and heavy. A few years ago, a documentary crew shooting in the jungles of south america had to build a 100 ft. pier to unload their 70mm cameras from a ship. Digital cameras can be carried with one hand in a small case.

Moreover, any film print deteriorates over time and use. The film will be scratched each time it goes through a projector, and the film tends to break, and then has to be spliced together. If it is a 3D movie, both reels have to be spliced at the same point in the movie if a frame is lost due to the break. A digital copy lasts forever and does not deteriorate with use.

No matter how much Christopher Nolan likes the appearance of 70mm film, there is no way this technology can be sustained much longer.

A few years ago I witnessed a side-by-side comparison of 70mm film and digital projection in a large Imax theatre. The same movie was shown simultaneously in digital and from a film print. The brightness of each image was carefully measured and adjusted so they were the same. The images were cropped so that they each filled opposite halves of the screen. Most of the audience, and me included, preferred the digital image. Most noticeable was the whites were really white in digital and were yellow in 70mm film. The resolution difference was not noticeable to the average viewer. I also felt the color contrast was greater in digital.

There are still purists who insist that 70mm is far superior to digital projection, but they are in the vast minority. If you are one of those people, you would not have asked this question, nor would you be reading the answers!
Written 13 Dec 2015
https://www.quora.com/How-does-4k-cinem ... -70mm-film

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Re: VIDEO - digital contra analogic (fisier contra pelicula)
MesajScris: 12 Mai 2016, 11:36 
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Camera digitala ARRI Alexa ( https://en.wikipedia.org/wiki/Arri_Alexa ):

Imagine

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Re: VIDEO - digital contra analogic (fisier contra pelicula)
MesajScris: 12 Mai 2016, 11:49 
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Discutia seamana cu cea din zona audio. Avantaje economice si ergonomice dramatic in favoarea digitalului, o minoritate de "cunoscatori" (de multe ori denumiti "snobi") care inca mai sustin analogicul (care se duce rapid la disparitie din cauze economice). Avantajul analogului fiind mentionat astfel - "mai realistic". In audio se spune, "mai natural". Insa acest avantaj e apreciat doar de o minoritate. Majoritatea nu considera acest avantaj ca pe ceva important, doar ceva minor, un aspect secundar pe care multi nu-l baga de seama.
Si tot ca in cazul sunetului unde majoritatea apreciaza psiho-acustica si diversele cosmetizari, "impaieri", colorari, "dinamizari", in video majoritatea apreciaza definitia liniei, "sharp"-ul, culoarea de sorcova aprinsa ca o baliza, in general stimularea brutala a simtului needucat.
Cu cat citesc mai mult, cu atat discutia din zona video seamana mai mult cu discutia din zona audio cu mentiunea ca totusi in audio diferentele economice sunt mai mici si mai suportabile. In zona video dezavantajele economice ale filmului analogic sunt enorme!

Insa din punct de vedere economic, ergonomic, practic, digitalul e net superior. Ori asta e argumentul care anuleaza totate celelalte deoarece in final totul e o afacere unde conteaza profitul si eficienta.

Se pare ca pe video (film) analogicul inca mai exista datorita costului mare al proiectoarelor digitale pentru salile de cinema. Cele analogice inca merg (si vor merge oricat de acum incolo, au fiabilitate foarte mare), poate unele nu sunt inca amortizate si investitia in digital nu se justifica (inca) deoarece si profitul e mic (cu salile de cinema). Dar e clar, in urmatorii ani filmul analogic se va restrange pana la disparitie....

Citat:
Tyler Leisher

Film has an inherent grain to it which is not found in the 4k version. You'll also find that 4k has a more rich image than 70mm but all that doesn't really matter because you'll be doing a color grade to the images anyway.

The real difference between 70mm and 4k is that with 4k the image that you capture is what will remain throughout the post process... a 70mm film print needs to go through various stages of development before it can be edited (a telecine) as well as after the edit it goes back through a digital intermediate to get to it's final print form.

The resolution of 70mm is supposedly closer to 8k than 4k, but it really comes down to the display. Depending on the camera shooting the 4k image, the 70mm print MAY offer more latitude of stops in the exposure.

Ultimately, a cinema camera like the Arri Alexa is going to look better than a 70mm print. It's one of the reasons why 70mm film is a dying breed.

Lastly, in terms of projection and viewing it, a digital image is going to look more sharp and defined than a 70mm print will, but a 70mm print will look more "realistic" and has that film grain look.

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