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The problem with the other two potential spec bumps is that they cause issues with scaling. If you have four times the pixels, the scaling is simple: each original pixel can be approximated by four pixels on the new screen. If you've got 2x or 3x the pixels, there's no easy way to translate raster images without resampling, which degrades image quality and wastes processor time.
I agree. I'm confused why Apple would do a half-assed retina display, but rumors seem to be indicating as such. But who knows, maybe Apple really are gonna launch a 2048x1536 retina display in the next iPad. All I know is if they do that it'll be a huge technological achievement in several ways.
 
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