Quote:
Originally Posted by MfA
It can look sharper in theory, but only if you allow aliasing ... if you remove all the aliasing you are essentially going to be halving the vertical resolution (which is why generally some aliasing is left and they reduce vertical bandwidth by ~70%).
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Well, if you have a 1366 x 768 display, then obviously a 1920 width source will look sharper than a 1280 width source in the horizontal direction. There can be no argument there.
Whether the 1080 line interlaced version or 720 line progressive version looks sharper depends on the factors you mention. At best, 1080 can look sharper (by as much as the 1080:720 ratio suggests), with dumb deinterlacing they're quite similar, but the 1080i version will visibly bob. It's rare for interlaced signals to be filtered to half the vertical resolution, so suggesting you'll get 540 vs 720 isn't realistic.
Cheers,
David.