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Consider also that resolution is only one factor. Bandwidth is another. Digital movies are often full of compression artefacts, especially when there's a lot go
by grumpyprole 3y ago
Consider also that resolution is only one factor. Bandwidth is another. Digital movies are often full of compression artefacts, especially when there's a lot going on in the scene.
- CobsterLock 3y agoAs far as I know, movie theaters do not compress video. Its seems like they have a digital surrogate for movie reals https://en.wikipedia.org/wiki/Digital_Cinema_Package https://en.wikipedia.org/wiki/Digital_Cinema_Package
- smitelli 3y agoThat's true; with a cap of 250 Mbps for the DCP stream, and a 4K frame size of 4096 × 2160, that's ~28 bits per pixel (if the soundtrack is disregarded). There might be a small amount of subsampling or run length encoding going on, but it's entirely plausible to distribute and play an uncompressed film on a professional projector. EDIT: Forgot to factor frame rate into the math. Divide that by 24 frames per second. That got me curious, so I looked into it and found they're using JPEG 2000 on each frame with no inter-frame deltas. Essentially like a constant stream of I-frames.
- tehnub 3y agoFrom that link, it looks like they do compress and use JPEG2000 for it, with a max bit-rate of 250 mbit/s. IIRC 4k blu rays don't do more than 100 mbit/s, so that's quite a bit better.