Originally Posted by *UFO*
For a cable box, you want to set it to "native". If this option does not exist, I would choose 720p. Why? Because 1080i is horrible compared to a progressive signal. If you set it to 1080i, your cable box will convert every 720p channel to 1080 interlaced. How well do you think a cable box converts a progressive 720 signal into a 1080i signal? Not very well. Then after this, your television will convert it back to a progressive signal. Not very smart.
What am I missing here? The TV is physically 1920x1080 pixels. So whatever signal source you feed it, the set will upconvert it to 1080p.
1080i is easy for the TV. 720p must be upconverted.
I would think that if you had to choose between selecting a 1080i or 720p output, I would choose 1080i.
The way I see it is if you set your output to 720p, all of your 1080i channels are going to be downrezzed by your cable/satellite box to 720p basically discarding half of the resolution. Then the TV will upconvert that 720p signal to 1080p. So your 1080i channels will have lost significant resolution. Your 720p channels will pass through the box untouched where the TV would then upconvert it to 1080p.
If you have the output set to 1080i, all of your 1080i channels are going to maintain their original resolution. 720p channels would get upconverted to 1080p.
So basically unless your sat/cable box is horrible at upconverting, I don't see why you'd choose 720p? (I can understand choosing native, though I don't do that)
I have tried native vs. 1080p on many different sets. (I own 18 HDTVs). I have yet to find a TV that does a significantly better job at upconverting a 720p signal over my satellite receivers. I have my sat receivers forced on 1080. I understand that my sat receiver (most of my receivers are DirecTV HR24 DVRs) might not do as good a job on the 720p channels, but I cannot stand how long it takes to change channels when my receiver is set to native. I can surf some serious channels. I want instant results when I change a channel. On native, I have to wait for the TV to "sync" to a different signal.
So, my question is, am I not understanding something? Admittedly it is late and I am tired, but I can't see any advantage to choosing 720p on your source. You are losing half the resolution on all of your 1080 channels which your TV cannot recover when it converts to 1080p.