They are technically just stretching the video right? Where do the additional information for the new pixels come from? Does it cost a lot? What’s the simplest way to restore similar home videos to 4k crisp quality, can it even be done by a regular guy on a home computer?
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35mm film has a resolution of a digital image size of about 5,600 × 3,620 pixels. About 5.6k. Many older videos were 720k or lower.
If you go back to the original film you can get better resolution.
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