Quote:
Originally Posted by haertig
The human eye can detect photons hitting the retina, given a high enough quantity of photons. The source of the photon(s) can be infinitesimally small, as in a star many light-years away. This is not "seeing a photon" however. In order to be able to distinguish something from a different something sitting right next to it, you have to be able to resolve the somethings. Otherwise you are merely observing one somethings effect on the other somethings in its vicinity. Cramming more and smaller somethings into the vicinity will not change what your eye can discern.
None-the-less, it appears there is indeed a market of people who will buy 600dpi eReaders. And then 1200dpi after that. And on and on.
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This morning, you were going on about 720p being plenty for large TVs. But hook a computer to 1080p TV and bring up a text document in whatever app you like. There is no way a typical 8.5" x 11" PDF page is going to be comfortable to read. Just imagine how much worse 702p would be.
A bit mapped font optimized for screen readability might look OK at 60ish lines of text per screen on 1080p, but those fonts are long gone from general use and toolbars and such take up a lot of vertical space. Text can be more demanding than images because a low res image might look OK until you see it next to a high res image. But rough looking text looks bad without needing anything for comparison.
Also, e-ink displays can benefit from another aspect of high resolution. E-ink can only show 16 shades of gray. High res displays have effectively more shades via dithering without looking noisy as a result.