ios6 - Points per Inch on IOS device -


i trying convert ios points real length(inches).

im testing on new ipad. according spec. width 7.31 inches , in xcode has 768 points, means has 768/7.31 = 105 points per inch (horizontally).

from calculation, 105-point horizontal line should displayed 1 inch on physical screen.

however, when draw on screen , measure distance shorter calculated.

am missing here?

thanks,

from specs, 7.31 inches total width of device, not screen. there bezel around screen allow user hold ipad without touching interface controls on screen.

also, if scroll down bit, you'll see screen

  • 2048-by-1536 resolution @ 264 pixels per inch (ppi)

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