Comments on the 576p V's 1080i quality difference i have heard that in alot of cases 576p HD is as good or even better image quality than 1080i

Hi,

Are you sure you don't mean 720p vs 1080i; most of the discussion I have seen, usually focus around 720p vs 1080i....

Hmm... never seen a discussion regarding 576p vs 1080i

I personally can't comment on either (not enough experience), but am very interested...

cheers,

Ritesh

720 p doesnt really exist and is not transmitted by the stations i believe..

> 720p doesnt really exist and is not transmitted by the stations

That's right, but you can still view them (via certain DVDs, HTPC etc.)

Anyway, regarding 576p and 1080i, just from the shops and all, I'd say 1080i looks a lot more detailed and much better.

Remember 576p is SD, whilst 1080i is HD transmission, so I guess extra detais are there just by the fact that there are more lines !

cheers,

Ritesh

Humm

576i is SD, so 576p must be HD, also check the spec's on SD set top boxes, 576i output.
Link
The minimum HD picture resolution is be 576 lines x 720 pixels @ 50Hz progressive (576p).

576p is Channel 7's version of HD (albeit officially HD according to the Aussie Standard).

I'd rather have Nine's and Ten's 1080 lines of "higher" definition. The more lines (or pixels) the clearer the image and the greater the detail.

HD can be 576p or 1080i in Australia. Channel 7 and SBS have choosen to broadcast their mandated 1080 hours per year of HD as 576p. Channel 2, 9 and 10 have choosen 1080i.

There is a crucial difference when watching 'HD' as to whether you are receiving a native broadcast or an upconverted broadcast. A native broadcast means that the program has been produced in HD and is being transmitted as such. An upconverted broadcast merely means that the program has been produced in SD and converted to a HD signal through processing at the TV station or by the STB. Obviously a native HD program will be much better quality than something which is 'artificially' upconverted through software/hardware (eg you can't gain resolution).

For a native HD broadcast, using a HD STB and HD Ready TV, native 1080i will always look better than 576p (more natural/subtle looking colours, more detail apparent and, depending on the display device, more resolution).

For upconverted HD broadcasts, whether you use 576p or 1080i is probably a personal preference because the picture is similar. If you live in an area with the odd native 1080i broadcast, you might as well leave the STB on 1080i. If you live in an area currently without native 1080i, you will find that 576p gives more natural colour compared to SD DTV. For example, watching a show like Seinfeld on 576p is like watching a brand new transmission - the improvement in colour distinction is immediately obvious.

576i is half of a discrete 576 line frame 50 times a second. Total of 25 discrete 576 line frames a second.

1080i is half of a discrete 1080 line frame 50 times a second. Total of 25 discrete 1080 line frames a second

From the resolution above 576p should be all of a discrete 576 line frame 50 times a second.

Somehow I suspect all we have seen so far is 25 frames a second, each one repeated to make 50. That would be the SBS upconversion, buffer the first half, add it to the second half, then broadcast the composite twice.

I recon if we really got 50 discrete frames a second it would be soooooooo smooth, but we haven't seen it yet.

Someone tell me I'm wrong ........ please..............

Best of luck,
Dik

Steve

The point is WE the viewer no not the difference between native and upconverted 1080i. my display tells me its 1080i and my stb but we really require the broadcaster to tell us the truth and fo e.g. a symbol like this may be the go

[SIZE=7]HD+ ...
... 9
...[SIZE=7]

We can't tell the difference can we? Not sure what you are doing with High Definition if you can't tell but I sure can. Upconverted looks shocking compared and there is no single chance it couldn't be noticed - perhaps you need a new TV.

Watermarks? You really want them?! Oh well, just make sure that I don't get Channel 10 doing that. Why on earth would you want a logo if you can't tell the difference anyway?

Channel 7's 576p loop looks like pure shxx when compared to channel 9 's magnificent 1080i loop.
It's a no contest.

576p as impemented in Australia is 25 progressive frames of 576 lines per second, not 50 progressive frames per second.

Some local broadcasters original material in what's known as 1080 pSf which means "progressive segmented frame". This is actually 50 interlaced fields per second. However these fields are derived from the exact same point in time (unlike conventional interlaced images which are 1/50th second in time apart) and so the segmented frame's fields can be combined to form a true progressive frame with no quality loss or atifacting.
The 1080 pSf material is converted to 576p for HD transmission with a high quality converter which retains the progressive nature of the source material without the artifacting and resolution loss you'd see with de-interlacing conventional 576i50 source material.
Hope this helps.

Cheers
JB