Couple of questions about resolution (720p v. 1080i).

Discussion in 'Archived Threads 2001-2004' started by Kent Wo, Mar 11, 2003.

  1. Kent Wo

    Kent Wo Agent

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    Okay, HD Tvs come with 1080 resolution. But what sources send signals in that resolution? Aren't DVD players 480p? Also, which resolution is supposedly clearer, 720p or 1080i?

    Thanks
     
  2. James Dailey

    James Dailey Auditioning

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    It's a debatable issue. Some feel that the increased number of lines makes 1080i better than 720p, while others feel that the progressive images of 720p makes it better than the interlaced images of 1080i. Many LCD's, Plasma's and DLP's sample things to 720p, while many CRT's sample things to 1080i. So it really just becomes a question of taste. IMO, either's better than 480i, so I'm not concerned either way.
     
  3. Michael TLV

    Michael TLV THX Video Instructor/Calibrator

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    Greetings

    Both 720P and 1080i have their strengths and waeknesses. It depends on who you ask.

    Of course, we'd all like 1080P instead.

    Regards
     
  4. GlenHaag

    GlenHaag Supporting Actor

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    Mmmmmm.... 1080P. [​IMG]

    I've yet to see 1080P, but I've read plenty about it to make me think about how great it is.

    Glen
     
  5. Neil Joseph

    Neil Joseph Lead Actor

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    HD-VHS (D Theatre) is available as well as the regular broadcasts in 1080i. For HD-DVD the wait is a few years.
     
  6. Kent Wo

    Kent Wo Agent

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    So what broadcast in 720p?
     
  7. James Dailey

    James Dailey Auditioning

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    Amen, 1080p would be truely the way to go. Stop the confusion and just make one single format, and start broadcasting everything in it immediately.[​IMG]
     
  8. SeanA

    SeanA Second Unit

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    If your local networks are broadcasting HD, it will be either 720p or 1080i. Here is a listing for the Milwaukee WI area (not sure if it is the same everywhere):

    CBS (1080i)
    NBC (1080i)
    ABC (720p)
    FOX (480p)
    HBO (1080i)
    Showtime (1080i)
    HDNET (1080i)
    Discovery (1080i)

    If you are close enough to the broadcast signal and have the right/good antenna, you can even pick up HD over the air (OTA). But you do need an HD tuner if you only have an HD-Ready TV. I plan to buy a tuner soon, and do some work with antennas to see what I can get.

    Of course, you can also get the HD signals with Digital Cable or Digital Satellite.
     
  9. ManW_TheUncool

    ManW_TheUncool Producer

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    ESPN HD will be 720p as well when it arrives (ETA next month). For the most part, 720p is touted by some high action/sports programmers due to the high frame rate and progressive nature of that format although HDNet uses 1080i as do CBS sports.

    _Man_
     
  10. Brian Schucher

    Brian Schucher Supporting Actor

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    I just wish i was able to compare both in their native formats. My TV (most i think) will only display 1080i HD. The STB upconverts all 720p to 1080i. I would have loved to see the Superbowl in native 720p in order to comare with the 1080i of the CBS playoff games...
     
  11. Kent Wo

    Kent Wo Agent

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    Is there a way to stop your tv from converting the signal from 720 to 1080?
     
  12. Bill Lucas

    Bill Lucas Supporting Actor

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    Knet,

    If you TV won't do 720p, then no there isn't a way to stop the conversion.

    720p is a higher resolution signal than 1080i. If 720p were an interlaced signal the resolution would be 1440i. Look at it this way, there are 720 lines displayed at any point in time when 720p is presented. When 1080i is presented there are 540 lines present at any point in time. 720p also gives much smoother pans and there are no interlacing artifacts as there are with 1080i. It's not really a debate. Just do the math. [​IMG]
     
  13. TyR

    TyR Extra

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    Is the fact that a TV won't do 720p sufficient reason to avoid buying that TV? (I'm in the market for a lower end HDTV -- it's lower end or nothing on my budget -- and have in mind either the Samsung 3296HF or the Samsung 3297HF; do I understand correctly that neither of these models will do 720p?)

    Edited to add: a great deal of my use of the TV will be dedicated to watching sports -- more sports than DVDs ,in fact.
     
  14. Andrew_Ballew

    Andrew_Ballew Second Unit

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  15. Richard Paul

    Richard Paul Stunt Coordinator

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    Though some argue that 1080i has a better resolution there are two reasons its not. First is that all CRT displays under $5,000 that I know of have a maximum horizontal resolution of about 1280 and many have less. Second is that interlaced artifacts degrade the vertical detail up to 50%. That means all 1080i consumer HDTV's have 540Hx1280V = 691,200 pixels every 60th of a second. Even at every 30th of a second with a realistic decrease of 25% vertical detail (slower movement has less decrease while fast motion can have a 50% decrease) we would have 810Hx1280V = 1,036,800 pixels. Though on paper 1080i does have a better picture in the real world the only present advantage is a slightly higher vertical detail. Also this advantage for 1080i is only for video at 30fps(frames per second) while at 60fps, which I believe will be used for ESPN HD, 720p has 1,843,200 pixels every 30th of a second while 1080i has only 1,036,800 pixels. Also since all 720p displays can do 24fps movies by an alternating 2-3-2-3 frame sequence, movies would be clearer at 720p than 1080i.

    Technically there are 1080i displays that can do 1920 horizontal pixels but they could end up never being cheaper than $10,000 since those CRT's are very hard to make. The future of displays will be LCD based technologies such as Sony's SXRD which is already capable of 1080p. As several have said the best resolution would be 1080p, but it will take at least 5 years before its becomes affordable.
     
  16. Doug Smith

    Doug Smith Second Unit

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    What does PBS broadcast in? The travel features they show seem to look the best!
     
  17. ManW_TheUncool

    ManW_TheUncool Producer

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    PBS does 1080i.
     

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