How are they able to release older movies in 4k?

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Were they shot in 4k or something we just didn’t have TV’s that could see 4k back in the day?

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Older movies can be released in 4K resolution through a process called remastering. This involves taking the original film negatives or prints and scanning them at a very high resolution. The resulting digital files are then carefully restored and enhanced to improve the overall picture quality, color accuracy, and clarity. This process can also involve the removal of scratches, dust, and other imperfections. The final 4K release provides a significantly higher level of detail and visual quality compared to the original versions, making it suitable for modern high-definition displays.

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