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For example, preparing a launch screen of 320 x 480 would have to be changed….
How is that going to work for us? Are programmers always going to have to be submitting a high-res that will be scaled down for old devices such as the iphone 3g?
The size of the screen is basically 4 times on a pixel by pixel basis. So each pixel of your image for example gets boosted to 4.
What this means for you? You don’t have to change your App, your app will scale to the hi res screen for you, same with your UI and images within your UI. Of course if you want to take advantage of the better screen quality you will have to submit hi res images.
I haven’t looked at going the other way but I believe it would be a similar case.
One exception to this is text. It automatically scales to the higher res for you for free. So text will look super sharp. One problem with this is if your loading image has text based on the original load screen that wouldn’t look the same as when the high res text loads.