I think the issue with the android wallpapers being grainy or pixilated in areas have to deal with the way the android OS resamples the .jpg or .png when it makes it your system wallpaper. That would also account for why the image looks so good in the preview (even when magnified many times) and ends up slightly off on the desktop. As for the specifications for the wallpaper if you were building one in photoshop would be 640x480 at 72dpi resolution in .jpg or .png format. If you save it as .png make sure you dont save it with interlace.
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