George Ou at Digital Society is saying that Apple may have massaged some numbers in demonstrating the effectiveness of the iPhone 4′s new Retina Display.
By analyzing the comparison images that Apple provided during the keynote, Apple appears to have suggested the new screen has a resolution anywhere from 489ppi to 815ppi, far beyond the actual 326ppi the screen has.
The implication is that the device has 4x the number of pixels, and Apple is hinting that it also has 4x the density. However, since PPI is a linear measurement, you actually need 16x the number of pixels to get 4x the density.
Sure, this is a pedantic takedown of an onstage demo, but hey, we’re geeks, we like that kind of thing.