Originally Posted by Goose81
Also there is little or no diff between 1080i broadcast on televison and 720p,if there is it is not noticable to the human eye.
If the person was watching only hdtv at 1080i,then a full hd tv would have no better picture.
It sounds better but as you know,each line is just doubled so it sounds better but real life tests have shown no real difference.
Also at 40 inches or lower the need for 1080p is not going to be noticed,a larger screen would be needed to notice a major difference.Although with most tv's now 1080p it would be stupid to by 720p hd ready.
There is a huge visible difference on a proper HD size set, it's 67% between 720 & 1080
PAL 576 is 80% of 720. A much smaller difference.
NTSC 480 to 720 is 67%... So is there not much difference between NTSC and 720p
NTSC to PAL is 80%.
I can clearly see the resolution change of 480 to 576 to 720 to 1080.
720 is not as useful a step up for us as it is in USA and JAPAN.
HD was invented NOT for a sharper same size picture, but for bigger TVs. The US had 36" to 48" TVs commonly before we even had Widescreen.
Assuming a 32" WS you can't see the pixels, then the same quality is possible at 60" using 1080 (i or p doesn't matter). Less than 60" you can't see loss of sharpness. 720 lines at SAME sharpness (where you can't see edges of pixels) is 40"
So 720 line 40" is equivalent to 32" Standard screen at a distance given by your eye's resolving power or further.
40" would have been a pre HD screen EASILY in USA. So if you are happy with 37" or less WS there is no point worrying about the lack of Irish HD TV.
Often SD program material is poor and upsampled from 480lines to 576 or from Tape. HD material is scanned at over 2400lines and downsampled to 1080, hence even on SD or smaller screen looks much better. Also much Digital SD is over compressed. Some is only 544x576.
1080p and 1080i is EXACTLY the same number of lines and same resolution, Really. The only difference is that the 1080p lines are shown twice as fast.
There are no 720p european disks or Broadcasts and almost no 720p sets. Most non-1080line sets are 768.
At 40" the real resolution is not so important. With 2:35, 2:40 Cinema formats a 48" to 60" is nice as the height gets rather low otherwise, then you want 1080 line, not inferior 720 or 768, especially as all the European distributed content is 1080 line.
Sky's 3D HD (with hardly any content) would likely use 1080p signal that is really 2 x 1080i signals, one for each eye. Using 1080i for 3D would either make it very flickery (12.5fps) or reduce resolution to 540 lines. If they use 1080p signalling the Sky box can output 1080i as 1080i or 1080p of just left or right channel (The mono version of Stereo sound is best the channels added, but 2D version of Stereoscopic 3D is best done by ignoring one channel).