1280 x 800, 720p ??confused?? - AVS Forum
Forum Jump: 
 
Thread Tools
post #1 of 11 Old 07-29-2011, 12:02 AM - Thread Starter
Member
 
eje0100's Avatar
 
Join Date: Aug 2003
Posts: 74
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
I am looking at a lot of 720p projectors right now that are out, and some that are due to come out in the next few months.

I am confused why these 720p projectors actual native resolution is WXGA resolution 1280 x 800 and not 1280 x 720.

Does playing a 1280 x 720 movie or game, on a 1280 x 800 projector cause any problems?

I would think if anything it would add input lag as the pj would have to convert the 720p movie to 1280 x 800.

I plan on using the projector for an iRacing game race cockpit setup 99% of the time. iRacing said they support 1280 x 800 and 1280 x 720

Which would be the best resolution to feed these projectors 1280 x 800 or 720? I would think 1280 x 800 but maybe I am missing something here.

Really confused and any and all info on this is greatly appreciated!
eje0100 is offline  
Sponsored Links
Advertisement
 
post #2 of 11 Old 07-29-2011, 12:31 AM
Member
 
LeonZA's Avatar
 
Join Date: May 2011
Posts: 84
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 13
It doesn't really 'convert' anything. Playing back 1280x720 on a 1280x800 projector will just add not so noticable 40 pixel wide black bars on the bottom and top of the screen. It shouldn't cause any problems. If the source content(iRacing) supports 1280x800 then 1280x800 would be the best resolution to use.
LeonZA is offline  
post #3 of 11 Old 07-30-2011, 12:04 AM
AVS Special Member
 
DanLW's Avatar
 
Join Date: Apr 2005
Location: Germany
Posts: 1,332
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Liked: 29
Another nice thing about the 80 extra pixels is you have a little bit of "digital lens shift" available if needed. If the projector has that option in the menu, that is.
DanLW is offline  
post #4 of 11 Old 07-30-2011, 12:22 AM - Thread Starter
Member
 
eje0100's Avatar
 
Join Date: Aug 2003
Posts: 74
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
^Cool, yeah and if I do go with one of these I will be running it at 1280x800. So really not sure why I even asked this question, but it does puzzle me. lol

Quote:
Originally Posted by LeonZA View Post

It doesn't really 'convert' anything. Playing back 1280x720 on a 1280x800 projector will just add not so noticable 40 pixel wide black bars on the bottom and top of the screen. It shouldn't cause any problems. If the source content(iRacing) supports 1280x800 then 1280x800 would be the best resolution to use.

Thanks I figured that. The reason why I asked though is because in this review of the gt720 (which has a 1280x800 native resolution) they say.


Quote:
Originally Posted by videoprojectorinfo View Post

It claims to be a projector for gamers, but most game systems operate at the 720p, 1080i, or 1080p resolution, none of which the GT720 can rescale to very effectively. Sure, it’s technically capable, but we noticed severe Moire patterns and illegible fine text.

Motion: In native resolution, good, smooth performance. Terrible at resolution scaling for video formats, which could be problematic for HD gaming

Resolution scaling (4.88)
The Optoma GT720 has a native resolution of 1280 × 800 (WXGA), but is technically capable of handling all standard video resolutions. It’s up to the projector’s internal processing to scale the video signals for display. Overall, it’s not very good at this task. This is significant for gaming systems, which are 1080i and 1080p, by and large.

480p
When we fed the Optoma GT720 video in the 480p format, we saw no problems. This was the best of the three resolutions.

720p
With 720p content, the Optoma GT720 showed major problems with high frequency patterns. There was an incredible amount of Moire. Also, fine text was difficult to read.

1080p
With 1080p content, we saw exactly the same problems with Moires in high frequency patterns. However, fine text was easier to read.


This is why I figured running 1280x720 which needs to be 'rescaled' would cause increase input lag.

Really not sure what is involved in rescalling.

If it's just adding some black bars then it's probably not adding much if any input lag.
eje0100 is offline  
post #5 of 11 Old 07-30-2011, 01:28 AM
Member
 
LeonZA's Avatar
 
Join Date: May 2011
Posts: 84
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 13
1280x720 shouldn't require rescaling. For example most projectors have rescaling/aspect ratio options to chose from to handle different resolutions other than the native resolution(1280x800). For example my Casio XJ-A230 has three options. Normal, Full and True. Normal will just add black bars to a 1280x720 signal, but still have 1:1 pixel mapping in the middle where the 1280x720 image will be projected (No rescaling).
Maybe the GT720 doesn't have such an option and tries to do some weird scaling things to the signal for resolutions other than 1280x800, but I doubt it.
If that really is the case then it is technically possible to create a virtual 1280x720 with black bars resolution from 1280x800 with Powerstrip as far as I can remember.
LeonZA is offline  
post #6 of 11 Old 07-31-2011, 12:33 AM - Thread Starter
Member
 
eje0100's Avatar
 
Join Date: Aug 2003
Posts: 74
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Cool man thanks for the info.

Does anyone know what source content would looks better on one of these 1280 x 800 native pjs?

1280 x 800

OR

1600 x 1200

Thanks!
eje0100 is offline  
post #7 of 11 Old 07-31-2011, 05:48 AM
Member
 
LeonZA's Avatar
 
Join Date: May 2011
Posts: 84
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 13
Quote:


Cool man thanks for the info.

Does anyone know what source content would looks better on one of these 1280 x 800 native pjs?

1280 x 800

OR

1600 x 1200

Thanks!

1280x800

By source content do you mean 3d graphics rendered from a game? If that is the case then leaving it on 1280x800 would be the best.

If you have a 1600 x 1200 source video then you have two options. You could set your resolution to 1600 x 1200 and let the projector scale it to 1280x800 or you could set your resolution to 1280x800 and let the software scale it to 1280x800.
You can compare the two and decide which one does scaling the best.
My preference is to let the software handle everything and don't let the projector scale anything.
LeonZA is offline  
post #8 of 11 Old 07-31-2011, 11:56 PM - Thread Starter
Member
 
eje0100's Avatar
 
Join Date: Aug 2003
Posts: 74
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Great thanks so much for the info, big help!
eje0100 is offline  
post #9 of 11 Old 08-01-2011, 03:26 AM
Member
 
ForbiSK's Avatar
 
Join Date: Dec 2010
Posts: 34
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Quote:
Originally Posted by eje0100 View Post
I am looking at a lot of 720p projectors right now that are out, and some that are due to come out in the next few months.

I am confused why these 720p projectors actual native resolution is WXGA resolution 1280 x 800 and not 1280 x 720.

Does playing a 1280 x 720 movie or game, on a 1280 x 800 projector cause any problems?

I would think if anything it would add input lag as the pj would have to convert the 720p movie to 1280 x 800.

I plan on using the projector for an iRacing game race cockpit setup 99% of the time. iRacing said they support 1280 x 800 and 1280 x 720

Which would be the best resolution to feed these projectors 1280 x 800 or 720? I would think 1280 x 800 but maybe I am missing something here.

Really confused and any and all info on this is greatly appreciated!
One more thing: if actual native resolution of projector is 1280:800 (WXGA) instead of 1280:720 (720p), it might be data projector. If so, it is not so suitable for dynamic content. For example theres a projector BenQ MW512, which has native resolution of 1280:800 pixels, atractive brightness of 2800 ANSI lumens, but it is not as suitable for gaming as etc BenQ W700 model, which is actually video projector and is perfectly suitable for gaming.
ForbiSK is offline  
post #10 of 11 Old 08-04-2011, 05:37 AM
Advanced Member
 
BishopLord's Avatar
 
Join Date: Apr 2007
Location: Florin, Ca
Posts: 543
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 12
What I did when I still had my GT720 was to leave it set for 1280 x 720 via Window 7's desktop resolution. You'll need this (x720 @120hz) for 3D. Looked just fine for 2D displays as well. Not a good as 1920 x 1080p via a 1080p PJ, but you'll get used to it. Blu-ray movies and 3D look awesome at 1280 x 720, however, if you have a lot of desktop icons, forgetaboutit.

Even though it's 1280 x 800 native, you don't need to keep it at this resolution. I would play around with the PJ's setting, but ultimately did the resolution changes via Window's desktop control. You can even go as high as 1920 x 1080 but it get's down converted. It's hardly noticeable, even on my 150" screen, but my PJ was defective, so I don't know if it was a focusing issue or what, but the text wasn't as sharp as my Epson 8100.

Only real issue I had was placement of the PJ and adjusting my screen. Hard to explain, but it wasn't even close to a perfect fit for a wide-screen screen and I had to do a lot of vertical key stoning.
BishopLord is offline  
post #11 of 11 Old 10-08-2011, 08:17 AM
Newbie
 
shouse's Avatar
 
Join Date: Jan 2011
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Quote:
Originally Posted by ForbiSK View Post

One more thing: if actual native resolution of projector is 1280:800 (WXGA) instead of 1280:720 (720p), it might be data projector. If so, it is not so suitable for dynamic content. For example theres a projector BenQ MW512, which has native resolution of 1280:800 pixels, atractive brightness of 2800 ANSI lumens, but it is not as suitable for gaming as etc BenQ W700 model, which is actually video projector and is perfectly suitable for gaming.

whaaaa? Explain please. What specs are you comparing here? I'm looking for something measurable, not someone's word.
shouse is offline  
Reply Digital Projectors - Under $3,000 USD MSRP

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off