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Stretching an image induces noise etc which isn't as easy to decern in a smaller image because it's so small, your eye can't take in enough information to know what is out of focus etc, so you brain conjures up an image that "feels" sharp!
If the image is bigger, your brain can see the artifacts and in the larger image these are apparent
Cheers
Last edited by TrevorW; 28-04-2012 at 08:36 PM.
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