I really dont know if this is the correct place for this quiestion but I dont know another place to find the exact answer.
Im working on an iphone project, the designers sent me the material in really high resolutions: for example for iphone 4 they sent me 2667 × 4000 images(up to 5mb) (for the background) and for iphone 5 2667 × 4733 (up to 6mb) and there are like 15 viewcontrollers using one of this images (different for each) all of them in PNG.
So the problem is that I found out that in my device settings the app is 155mb of size and Im assuming this is caused by the HD resolution images
So I want to know which is the correct ppi(inches per pixel), the format its png thats ok, and the correct resolution for each device.
Thanks.
Have a look here: http://dpi.lv/
Sorry its an off- site link, but it is quite nice: They run a database of devices, their resolutions and ppi. And if you look at it with the device in question give you the specs for it.