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curl-6 said:

720p is 3 times as many pixels as 480p, 1080p is only double 720p.

ONLY if you compare 480p in 4:3 (640x480) to 720p 16:9 (1280x720) it is a factor of 3.

  • 852x480 (16:9) = 409 kPixel
  • 1280x720 (16:9) = 922 kPixel (factor 2.25)
  • 1920x1080 (16:9) = 2074 kPixel (factor 2.25)

So it is the same factor going from 480p to 720p and going from 720p to 1080p