CurtPalme.com Home Theater Forum

[barcodude]

anybody got a technical insight about this

i got a cheap 701mm on a dutch e-bay, with a blurayplayer direct to the projector.
i can set it to 1080i or 720p i see a little more charpness in 720p mode but 1080i seems to be more clean with no mistyness
how about the wear on the tubes in 1080i or 720p?

somebody?

[ecrabb]

I always preferred 1080i for the significantly-increased spatial resolution. This was true of both my old 12xx and even on my G70.

It's possible that 720p may appear sharper, but that sharper image has significantly less spatial resolution. Or, think about it like this: Would you rather have a sharper .9 megapixel image or a slightly softer 2 megapixel image? I'll take the latter.

For fine detail like film grain, stars, etc. I think 1080i smokes 720p. Plus, if you're not running a scaler, motion on film-source Blu-rays will be smoother with 1080i.

SC

[barcodude]

that's what i noticed 1080i plays smoother only lacks the depth of 720 or is it my setup on my barco?

anyway thank's for the reply

ps i had a low rate scaler but it died (something on the motherboard) so i tried it without and voilá even sharper!
or again whas it just my setup? oh and i had some stupid media player with compromised blurlray rips hookt on my scaler
so i tried a real bluray duh

[draganm]

[barcodude]

i just tested 1080i with oblivion (tom cruise) and yes 1080i does it for me thanks a bunch!!!!

[barcodude]

[ecrabb]

[barcodude]

[tschaeikaei]

There are two main reasons why one aspect ratio is better for a CRT than another.
First is phosphor usage. The tubes phosphor surface is (about) 4:3.
It is always the best idea to use as much of it as possible.
That slows down the wear (= longer tube life), puts out the most resolution (=best sharpness) and kind of
provides even heating up of the tubeface.

If you are running video games from a PC, go with 4:3.

If you are running movies, go with the resolution and aspect ratio of your movies.
It doesn't make sense to set the projector up with e.g. 1920x1440 which is 4/3 and then watch 2,4/1 movies in 1920x800.
If you do that, you end up with black bars above and below the actual picture,
the projectors electronics have to scan these black bars, so they get hot.
And you'll get a softer picture since the electronics run at higher frequencies and that produces noise.

Since you tried 720p and 1080i, you already saw this effect. 1080i is always sharper, because the tubes do resolve it well
on nearly every projector and the electronics are stressed less than at 720p.

1.3*(1080*60Hz)/2=42,12kHz and 1.3*720*60=56,16kHz.

The reason why high end 9" projectors are mostly set to 1080p instead of 1080i is that on interlaced you can see motion blur.
Avoid that using higher vertical frequencies. Most people use 1080i72Hz, which is always a good compromise.
I did 1080i 96Hz on a NEC 9PG, it did not sicnificantly improve over 1080i72 but very much over 1080i60.

But since your projector is rated at only 45MHz bandwith i'd suggest that 720i60 could be best. (1280*720*60*1,3)/2=36MHz.
If motion blur visibly occurs, try 720i 72, thats 43,1MHz.
Bandwith numbers are always kind of a guide level, no actual numbers you can count on.

To use these unusual frequencies, a PC would be best. I don't know about any BluRay- player beeing able to put out 720i72 or stuff like that.

Regards, Julian

[kal]

[kal]

[barcodude]

thank's for all the replies

i notice that 1080i does it for me 720p seems a little more blurred i think because it does more with my barco
i also have a perfect setup on the1080i slot so why change? about the 720i that's a little more tricky. I had a pc but it didn't do it for me no were near a real bluray output, and only iso's can resolve a real good picture no mkv or mp4 will do
i know that media sofware will do iso's of blurays but ripping is much to much and i really want to support the people who sell the stuff because of all those free streaming, netflix and all pirate stuff so.....

viva la bluray

[tschaeikaei]

I put a BluRay drive into my PC and can use all of the described above.
Hardly to recommend. I even sold the standalone BR player. Had no use for it anymore.

Regards, Julian

[barcodude]