Re: Is there any real advantage to having an HDMI port?

On Aug 10, 8:45 am, The alMIGHTY N <natle...@xxxxxxxxx> wrote:

http://alvyray.com/DigitalTV/default.htm
and have not yet found anyone who could accurately debunk what this
guy (who is very highly regarded in the industry because of his
pedigree) is saying with actual facts.

His argument is that a progressive 720 image is superior to an
interlaced 1080 image. It goes out the window when comparing 720p to
1080p.

What I'm wondering is how 1080p versus 1080i could be exactly the
same. In any 1/60th of a second interval, 1080i has half the lines
1080p does, right? Then, in the next 1/60th of a second interval,
1080i has the other half of the lines. However, during each of these
1/60th sec intervals, 1080p has 100% of the lines.

I have to admit, I was a doubting Thomas myself. I had a 1080i set and
upgraded to 1080p not because of the resolution, but because I wanted
one of those snappy LED based DLP sets (my old set was simply a
projection unit.)

If you're talking about television shows, you're right, there's no
difference. Why? Because there is no HDTV signal that's 1080p. The
highest it goes currently is 1080i. Any quality difference to be had
would be a quality difference in the television.

Now when you're talking about 1080p media like HD-DVD or Blu-Ray I was
skeptical. On my 1080i set I really wasn't able to see much difference
between DVD and the HD formats. The picture was slightly clearer with
a little more detail but it wasn't a dramatic day and night difference
like there is between watching a show on a 480i SD tv station vs. a
1080i HD station.

Firing up the same movies in 1080p revealed a dramatic difference.
It's somewhat hard to describe, you really need to see it for
yourself. A still screen grab isn't going to show you the difference.

Here's a good example:

Fire up "The Matrix" on DVD (I'm asuming you have it, it's a common
choice.)
Go to the scene just after the kung-fu fight between Neo and Morpheus
where Neo is lying in his bunk talking to Morpheus.
In 480p Neo's sweater looks crisp and clean.
In 1080p you can count individual threads on the sweater. Not kidding.
In 1080i you can see the individual threads, HOWEVER, every time Neo
moves there's a weird shimmer effect because, even though the
resolution is nice and high, the pattern doesn't interlace very well.
It's distracting and makes it look worse than it would in a
progressive resolution.

Back in the olden days when someone would go on the Tonight Show or
David Letterman wearing a print jacket or a print tie the camera would
do the same thing. It can go from annoying to borderline nauseating
depending on how big the pattern is and how badly out of synch it is
with the interlace.

- Jordan

.

Relevant Pages

  • Re: Is there any real advantage to having an HDMI port?
    ... and have not yet found anyone who could accurately debunk what this ... Go to the scene just after the kung-fu fight between Neo and Morpheus ... resolution is nice and high, the pattern doesn't interlace very well. ...
    (alt.games.video.xbox)
  • Re: Why interlaced HDTV?
    ... The fact is that 1080i provides additional information in that frame time, in the form of significantly enhanced horizontal resolution and additional vertical resolution through the interlace. ... temporal resolution department it seems logical to fix this at the same time. ... If it means that it cannot be rebroadcast without introduction of artefacts than it is not progress, ...
    (uk.tech.digital-tv)
  • Re: Why interlaced HDTV?
    ... if you ignore the fact that interlace is already 50% data ... >>the fact that 720p has double the temporal resolution of 1080i ... >additional information in that frame time, ... >>you and I are familiar with to a museum, but that's progress for you. ...
    (uk.tech.digital-tv)
  • Re: 1080p vs 1080i
    ... each pixel in the picture is refreshed at a different rate b/w the two ... But once the image is moving, the interlace degrades the ... artifacts, or reducing the resolution by half (or some ... also improve the appearance of 1080i signals if good deinterlacing is used, ...
    (alt.tv.tech.hdtv)