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i have designed an UI for iPhone 4S. I just want to know what will be the output if i use same image and UI in iPhone3 which i have created for iPhone 4S after development the application. Or if i'll run the same application in iPhone3 and iPhone 4S.

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First of all manisha please check your first question which you have posted here, we need more information when such question comes – Jack Jan 10 '12 at 12:09
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and nothing will happen, you are designing an UI for iPhone 4S and if you use same image and UI in iPhone3 the design will look similar to this,(its all about using images/icons what's the big deal) is it something like using same icon or image gonna crash the application?? – Jack Jan 10 '12 at 12:12
Thanks Jack for your reply. i just want to know if i am creating images for iPhone 4s the resolution will be 640px*960px. so if i will use the same UI for iPhone 3, will images get pixelated or not – Manisha Gupta Jan 10 '12 at 12:30
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You need to make icon size bigger else they will look small.. – Jack Jan 10 '12 at 12:45
thanks Jack :-) – Manisha Gupta Jan 10 '12 at 12:49
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2 Answers

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Nothing should happen. The iphone 4 has a higher pitch screen but doesn't usually effect the number of pixels in an image/UI however I would think using high res UI design would slow down the iPhone 3. the best way to check is design a background image or UI element and see how they look on each iphone.

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This is probably more of a problem if you are talking about OS based icons e.g. for the home screen as already mentioned the 4S has a higher resolution screen than the 3 and therefore up-scaling may result in pixelation. If they are code based rather than pixel then its probably again not a problem.

If it does end up a problem targeting device version should be possible.

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