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I think best is to provide the max sizes or maybe small, middle and max sized versions: gadgets can resize image if needed, and if the difference is not too big, wtih ok quality.
And, you should be able to use tablet horizontal or vertical... Best would be square with the max width (like 2560x2560)..
I still find the whole question of producing a whole bunch of tab/phone back size's a little daunting to say the least! My (easy) conclusion is to produce one size to fit all. Or at least something people can manipulate and acquire the size for their device via a graphic program perhaps ?
Even better would be an app that could crunch down to the right size (I'm still looking for such an app!).
Creating Live Animated Wallpapers for Mobile and Tablet Screens
How To Links and Video and Creator Programs
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