1080i Vs 720p

[EddieG]

I have a 34" tube HDTV and have my cable box set for 1080i. Should I be watching in 720p?

Does 720 lines progressive really give a better picture than more lines that are interlaced?

Thanks!

Eddie

 

[j_garcia]

In general, you would be hard pressed to tell the difference IMHO.

 

[avaserfi]

I agree with JC here especially because you have a CRT set which can actually display an interlaced signal unlike other display types which must deinterlace a signal before displaying it.

If you had a display that had to deinterlace I would probably recommend using the progressive setting as I hate jaggies caused by poor deinterlacing which is common with many televisions internal deinterlacing from what I have noticed. Just some info for the future .

 

[AcuDefTechGuy]

I have a 34" tube HDTV and have my cable box set for 1080i. Should I be watching in 720p?

Does 720 lines progressive really give a better picture than more lines that are interlaced?

Thanks!

Eddie

I don't think people can tell the difference between 1080i & 1080p. So I personally would choose 1080i over 720p.

 

[EddieG]

I agree with JC here especially because you have a CRT set which can actually display an interlaced signal unlike other display types which must deinterlace a signal before displaying it.

If you had a display that had to deinterlace I would probably recommend using the progressive setting as I hate jaggies caused by poor deinterlacing which is common with many televisions internal deinterlacing from what I have noticed. Just some info for the future .

Too bad you can't get a 50" crt

 

[avaserfi]

I don't think people can tell the difference between 1080i & 1080p. So I personally would choose 1080i over 720p.

Just because you don't believe it doesn't mean its true

Considering that progressive scan has twice as much information as interlaced there should be an is a difference, at least with moving images as still are the same thing. One example is that progressive scan images don't need deinterlacing as they have the full image. This can reduce jaggies substantially from what I have seen. And yes, there are good deinterlacers, but that still doesn't make up for the missing information entirely.

Read this.

 

[AcuDefTechGuy]

Just because you don't believe it doesn't mean its true

Considering that progressive scan has twice as much information as interlaced there should be an is a difference, at least with moving images as still are the same thing. One example is that progressive scan images don't need deinterlacing as they have the full image. This can reduce jaggies substantially from what I have seen. And yes, there are good deinterlacers, but that still doesn't make up for the missing information entirely.

That's why I have a 1080p HDTV.

But my wife can't tell the difference between my 1080p blu-ray/HDDVD and SD DVD upscaled to 1080p. So I'm thinking she can't tell the difference between 1080i and 1080p. So then, I'm thinking most people don't even care about HDTV, so they probably can't tell the difference either.

 

[j_garcia]

I have a 34" CRT and I have compared 720p to 1080i and I pretty much could not tell the difference between them.

 

[avaserfi]

I have a 34" CRT and I have compared 720p to 1080i and I pretty much could not tell the difference between them.

CRTs treat an interlaced signal very differently from a fixed pixel display as CRTs can actually display an interlaced signal. The real differences come from fixed pixel displays from what I understand of the subject and have seen personally as they cannot natively display an interlaced signal. Because fixed pixel displays cannot display this signal the processes involved in making this signal possible to display can be noticed.

 

[EddieG]

CRTs treat an interlaced signal very differently from a fixed pixel display as CRTs can actually display an interlaced signal. The real differences come from fixed pixel displays from what I understand of the subject and have seen personally as they cannot natively display an interlaced signal. Because fixed pixel displays cannot display this signal the processes involved in making this signal possible to display can be noticed.

You mention fixed pixels, which is LCD...how about plasma for interlaced vs. progressive since that is a gas, (and DLP for the sake of argument)?

 

[avaserfi]

You mention fixed pixels, which is LCD...how about plasma for interlaced vs. progressive since that is a gas, (and DLP for the sake of argument)?

LCDs, Plasma, DLP and all forms of projectors I know of are fixed pixel. I am pretty sure the only display type that isn't fixed pixel is actually CRT which is the dinosaur now .

In relation to interlaced vs progressive the processing algorithms used is what changes quality. I try to let other sources rather than my TV do the deinterlacing such as my Oppo/ps3 as I have noticed them doing a better job than the display.

 

[bigbangtheory]

What others have said is true. The modern tvs (i.e. not CRTs) do not show interlaced material in the same way as your tube tv.

And like others have said, the efficiency of a tv's interlacing ability is the critical factor we are talking about; if the tv's process is sophisticated and very efficient, your eyes won't tell the difference. If the process is, let's say, not-so-efficient, you might nail it down in some fast-moving scenes from a movie, Nascar racing, or what have you.

Having said that, I do think those who argue they can categorically see a difference are having some placebo effect going on...

BUT, as with speakers, let your senses be the judge! We can talk about details all day, but if you cannot make out an apparent difference with your own eyes, then what's the point? Take the Pepsi challenge, and have a friend switch between 720p and 1080i (and don't peek until he/she's ready). Whatever looks best to your eyes - if you can even tell a difference - is where you "should" keep the setting!