How is resolution calculated?

Related questions

1. What does PPI include?
2. Does Netflix support 8k?
3. Does PPI measure inflation?
4. Can our eyes see 60fps?
5. Is 72 ppi high resolution?
6. How does PPI affect display quality?
7. Is 72 pixels high resolution?
8. How many pixels per inch is 4k?
9. How far back does PPI go?
10. Can your eyes really see 4k?

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2. #pixel
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16. #pixels
17. #megapixel
18. #popular
19. #megapixels
20. #image
21. #resolution