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Originally Posted by Katsunami
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Because the screen has double the pixels, the line will need to be scaled up to 1600x2, and thus the reader will need to 'invent' every other pixel, as it's not there. In case of a line this will not be a problem, but an image will become blurry.
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Nothing needs to be 'invented'.
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If the resolution is not exactly x2 on each side, scaling will be worse....
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It could also be X3, X4, ... also.
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... (Nowadays, algorithms are good enough to also handle 1.5x or 2.5x, for example, but if it's something like 2.3, or 1.75, your image will definitely be blurry.)
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How often do you think you get an exact 800x600 image? How often do you think that 800x600 image displays with a one for one mapping (on a 800x600 display)?
There is going to be scaling on both, so if an 800x600 image is "good enough" on a 800x600 display, it is going to be "good enough" on a high res display.