Marcello wrote:
I don't know about the UK, but with SKY in Italy (same boxes AFAIK) you can choose to output 720p or 1080i.
Do you get poor results in both cases?
What about 1080p? Does SKY not support that? In the US it's been a long time since the highest resolution on cable or satellite was 1080i. Things went to 1080p a number of years ago.
Obviously operating at the native resolution of the panel is best, as it requires no upconversion. When I bought my first flat panel (which I still have, a Panasonic plasma) 720p was only just out. I picked an ED panel, 480p, for two reasons. One, in side by side comparison with the more expensive Panasonic 720p sets, the 480p EDTV had much better contrast, black level, and shadow detail. And since DVD was my primary source for movies, DVD being 480p it required no conversion to match the display resolution. And the picture was incredible, and still looks wonderful, only falling down when compared with my big VT series Panasonic.
480p from DVDs upconverted by my Oppo to 1080p looks quite good, but not as good as BluRay 1080p. Cable varies depending on the source material, some is obviously 1080p, some obviously upconverted, but even 1080p cable due to compression does not look as good as BluRay.
4k requires some serious upconversion processing it would seem, with all the attendant issues that can create.
When I compared the 480p to the 720p sets on DVD, I noticed that even with the sharpness dialed down, the 480p set, if you sat far enough away to not see the pixels (i.e. normal viewing distance) the 480p set looked like it had higher resolution, was sharper without the ringing that dialing up sharpness can produce. Maybe that was due to the upconversion, maybe to something else. In photography there is a thing called accutance. It is basically a subjective perception of sharpness and detail. Films that are "inferior" to others in terms of resolution, lines per mm or such, often look sharper and clearer than extremely fine grained film. The eye tends to perceive the grain, at a distance, as increased edge sharpness. Perhaps we have similar situations in video, it would seem to follow. (Yes, you see again my interest in human perceptual issues, audio and video!)