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filling the screen have nothing to do with DPI ... it have to do with size !!
480x640 or 640x480 ....
although 240x320 would also filled the screen too but stretchout ...so it'll look blurry !
as for DPI ... minimum is 96DPI for clarity ... and you can increase as much as you want to ... although not much different with a human eye to the small screen ... you probably can tell the difference if the screen was a big monitor though.... :approve:
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