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Just because technology can do something, doent meant its always right

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TimFox:

--- Quote from: james_s on June 10, 2022, 09:36:10 pm ---
--- Quote from: TimFox on June 10, 2022, 05:37:12 pm ---The SMPTE estimates that there are roughly 30 standards in use for digital cinema.
A popular specification (DCI) can be found at  https://dcimovies.com/specification/DCI-DCSS-v141_2021-1013.pdf
That spec references "4k" at 4096 x 2160 pixels, and "2k" at 2048 x 1080 pixels, and specifies that decoders for DCI shall handle both, and be capable of 24 or 48 frames/sec.

--- End quote ---

2K sounds like a significant step backward compared to old fashioned 35mm film. Frankly even 4K sounds low for a movie theater sized screen, personally I would consider 8K to be about the bare minimum to be called reasonable and given the high dollar movie industry I'm surprised they aren't using something really exotic.

--- End quote ---

The original film Imax standard used 70 mm sprocketed film transported horizontally, with each (huge) frame approximately 70 mm by 48 mm, at 24 frames/sec.
This is larger than the 70 mm frame with vertical transport.
The digital quasi-Imax stuff is available at 4k, 6k, 6.5k, and 8k, with 12k announced but not yet supported.  Some stuff operates at 48 frames/sec.
A laser version operates at 4k and 60 frames/sec.
These digital versions are evolving rapidly.

ejeffrey:
The red one camera supported 4k 15 years ago and was basically a standard for digital cinematography.  These days 8K is pretty common I think.  A lot of cameras are also designed to trade resolution vs frame rate so you might get less resolution in 2x or 4x slow motion or higher resolution for stills.

james_s:

--- Quote from: TimFox on June 11, 2022, 04:14:18 am ---The original film Imax standard used 70 mm sprocketed film transported horizontally, with each (huge) frame approximately 70 mm by 48 mm, at 24 frames/sec.
This is larger than the 70 mm frame with vertical transport.
The digital quasi-Imax stuff is available at 4k, 6k, 6.5k, and 8k, with 12k announced but not yet supported.  Some stuff operates at 48 frames/sec.
A laser version operates at 4k and 60 frames/sec.
These digital versions are evolving rapidly.

--- End quote ---

I've never seen a digital Imax, does it look anything close to the real deal? 12k doesn't sound adequate for such a huge film size and 4k is frankly laughable but maybe it looks better than it sounds.

TimFox:
I have not seen one myself.  Check the individual film listing carefully, since digital is taking over everything.

tooki:

--- Quote from: james_s on June 10, 2022, 05:27:48 pm ---Movies used to be shot on 35mm film, IIRC while analog it is roughly equivalent to 8K.

--- End quote ---
Yes and no. First, just a quick reminder that the oft-cited figure of 21Mp for 35mm refers to 35mm photographic film, which is run horizontally through the camera, giving a 36x24mm frame, whereas 35mm movie film runs vertically, with a maximum frame size of around 22x16mm.

Either way, though, the maximum resolution and the typical resolution vary wildly. Only the sharpest, slowest of films (low ISO) get the maximum resolutions, but require tons of light. Fast (high ISO) films for low light had markedly lower resolution, and modern digital can easily exceed those.

Additionally, there’s a huge difference between the film negatives and a typical release print, which is many generations removed from the negatives: release prints suck. (I’ve gone to special movie screenings done with fewer-generations-removed prints, and the difference is striking.) If I had to guesstimate, I’d say a typical release print probably tops out at 4K, if that, and many aren’t any better than 2K.

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