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In Reply to: RE: 1080p or 720p for 42 inch plasma ???? posted by PaulN on December 22, 2010 at 20:24:52:
"HD broadcast, which is limited to 720p or 1040i (which is just frame-doubled 540)"
It's probably a typo, but there is no 1040i -- it's 1080i.
1080i is not "frame-doubled 540" for many reasons. First, you probably meant line-doubled 540, not frame-doubled because that in and of itself used in this context doesn't make any sense, and I'm guessing you meant 540p because there is no 540i. The word "frame" means an entire picture. Second, line-doubled 540 would actually be 1080p (with only half the real resolution of a true 1080p signal), not 1080i. What 1080i means is 540 lines for two "fields" or, sort of, half-frames (the odd lines are shown first, the even lines are shown second): two different points in time, fields, are put together to show one entire picture, a frame. Actually, it's a bit more involved than that, but there's no need for an explanation of the concepts behind deinterlacing here.
"Your tv will need to downsample almost all of what you say will be your primary signals and the deinterlacing insnt very good on these low end models."
What you are probably referring to is scaling. If he gets a 1080p display, there will be no scaling from 1080i cable or Blu-ray -- which will be either 1080p or 1080i. The only scaling application will come from feeding the display from a source which is less than 1080 lines. But a 720p display, and with plasma this is actually 768p, scaling would have to be applied to each and every signal that is sent to it because there are no native 768 line signals. With regard to deinterlacing, as plasmas are progressive displays (save for a few models which are no longer manufactured), all interlaced signals will be deinterlaced when fed to a plasma -- both 720/768p and 1080p resolution displays.
"You need to think of what the poorest signal you are likely to watch is going to look like and use that as a guide."
Why do people always look at such problems as the original poster posed with such a lack of foresight? Why is "good enough" touted as The Gold Standard? Shouldn't one want signals from their best source (he did mention Blu-ray) to look their best? With a 720p (768 line) plasma, every signal fed to it would involve a compromise of one kind or another.
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Follow Ups
- incorrect information - Joe Murphy Jr 23:51:35 12/22/10 (2)
- RE: incorrect information - PaulN 19:15:19 12/29/10 (1)
- :-) - Joe Murphy Jr 20:58:12 12/29/10 (0)
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