In the apple docs it states
The portion is the optional string @2x and should be included only on images intended for use on high-resolution screens
What are high-resolution screens? iPhone 4's? Do I need to include one?
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38answers:
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+1
A:
I guess you missed the part where the iPhone 4 and it's double high resolution screen was introduced :-)
The iPhone 4 screen is 640 by 960.
To automatically take advantage of that you can provide graphics assets that have that @2x in the name.
When you use something like UIImage#imageNamed:, the OS will automatically use the high resolution image if appropriate.
It will also use those for the icons and launch screens if available.
They are all optional though. But I'm sure your users with an iPhone 4 will appreciate the high res artwork :-)
St3fan
2010-08-23 02:57:58
nice, thanks St3fan.
daidai
2010-08-23 03:02:23
So, if you have one image called `background.png` 40px by 40px, you should also provide an image called `[email protected]` 80px by 80px, to give your iPhone 4 users the best experience of your app.
Emil
2010-08-23 06:26:19
BUT you should still use `[UIImage imageNamed:@"background.png"]`, because the iPhone automatically finds the @2x-version if it's being run at a high-res screen (iPhone 4).
Emil
2010-08-23 06:28:12