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Interesting (old) thread. Basically we have a set of limitations. Camera sensor. codec. Display device. pre/post processing.
You will never get a higher field-rate or spatial resolution than that offered by the sensor. You will never get to watch a higher frame/field-rate or resolution than that offered by your display device. And in a bandwidth-limited world, your quality may be limited by the lossy compression, codecs may be more efficient on p than i material.
I tend to see interlacing as an analog 2:1 perceptually motivated compression method. I dont really see its purpose in this digital era, except for legacy purposes. If you want to trade motion/resolution/bandwidth, then use a lossy digital codec that does it intelligently..
-k
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