For video post-production
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For video post-production

8K video will provide immediate advantages when shooting and editing 4K projects; the camera operator will be able to plan a shot knowing it will be possible to 'punch in' later, and the editor will have more creative flexibility when cutting the project together.

The resolution provided by 8K will facilitate 2x cropping to 4K in post with no apparent loss of resolution, making it possible to simulate longer lenses or edit out distracting elements at the edges of a scene. It will also enable editing tricks like virtual zooms and pans. These techniques are frequently employed when editing 4K footage for HD delivery, but now the entire process can be scaled up.

8K will also allow you to do better green screen work. Good chroma-keying depends on the ability to discern fine details around the edges of your subject, such as hair. The more resolution you have to play with, the better. Other factors, such as color sub-sampling, are also important to the quality of green screen work, but all else being equal more resolution is an advantage.