As the title says, when you deal with real images which appear in splash screens or on background or in Alert popups, do you convert them to nine-patch or you simply resize them into several images (800x480, 960x540 , 720x1280, etc.)?
I am not converting them to nine-patch but resize to most-used formats and I am wondering if I am making a mistake in so doing.
I'd say that it definitely depends on how you want your image to behave on different screen sizes.
If you want to specify that some areas of the image can be stretched and some others cannot, then 9-patch seems relevant.
On the other hand, if your image should not be transformed/stretched then you'd better give as many image sizes as required to cover a majority of screens.