Re: BluRay/HDDVD compared to Movie Theater???
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Originally Posted by mseanschmidt
so if i'm watching true 1080p on my system what is the resolution of "film" at the theater? And, how is digital better than film at the theater?
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Back when I did digital darkroom stuff, we used to say that film was on the order of 3000 to 5000 lines per inch.
If one 1080p frame has 1080 lines in it, a single photo frame should have 3-5x as much, and possibly more depending on the size of the crystals involved in the developing of the negative.
And that was photo film. Not sure about movie film; because it's meant to display on a six to ten meter tall screen, they may increase the lpi. At 4000 lines per inch and using 70mm wide film at a 2.35:1 aspect ratio, that's about 4700 lines displayed on a 6100mm tall screen...or about 1.3mm per line (but viewed from six to eight meters away, at least, so the angle subtended by each 1.3mm line is pretty small...1.3mm divided by 7000mm = .000186)
A 60" screen will be about 550mm tall, and at 1080lines, that's about 0.5mm per line, but 2-3 meters viewing distance. 0.5mm divided by 2500mm is 0.0002.
So the movie screen will look slightly sharper given 4700lpi, and if film is finer grained than this, will only look better.
I have no special knowledge; all of the above is one assumption (about the lpi of film) and then some math. An expert may tell you different, and better.