Ruler on 21 December 2014
900p vs 1080p is quite a difference if you see it that way
720p = 1280x720 = 921,600
900p = 1600x900 = 1,440,000
1080p = 1920x1080 = 2,073,600
Difference between 720p and 900p = 518,400
Difference between 900p and 1080p = 633,600
900p is 518,400 more pixels than 720p, therefore it has 518,400/921,600 = 56.25% more pixels
1080p is 633,600 more pixels than 900p, therefore it has 633,600/1,440,000 = 44% more pixels
