When you use a digital camera, the image is broken down into however many individual pixels. We learn how to fit more pixels into a frame all the time.
Old film cameras record images directly onto a chemical film. This doesn’t give discrete pixels you can just flawlessly copy and move around, but the image itself is inscribed onto the film with molecular clarity; you could say every molecule in the surface of the film acts as a pixel.
Digital film is easier to manipulate, and every time we take old film out of storage it slowly degrades; but while digital video quality has grown exponentially since it was first invented, it’s nowhere near the resolution of the original film reels.
Studios usually film movies the old way, so they can wait for digital technology to improve, then re-scan the film with the latest digital technology.
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