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NiKKoM said:

Yes the common story on the web is that 35mm equals 4K but what people don't tell or know is that it's only on if the full frame of 36mm x 24 mm is used...
no movie have used that cause of aspect ratio and soundtrack stored :


above is the full 36mm x 24mm frame... as you can see the ratio in which movies are recorded aren't using the full frame..
You can ask any DCP converter that also depending on the ISO value a 35mm will result in 2.5K to 3.2K movies... which is awesome for bluray at 1080p but not 4K. sure you can scan them on 4K or even 8K and upscale it..  but the source material isn't shot in that..

So it's only 4k if it uses an aspect ratio close to 4:3 that covers the whole film? And the film won't have a horizontal resolution equivelant to around 3840? The resolution is still much higher than 1080p and closer to 4k and I've heard that it can vary throughout a film, so wouldn't it still benefit from being remastered at that resolution? I've also heard that any IMAX film will have more quality than 4k.