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Jesse S
Joined: 12 May 2007
Posts: 209
Location: Etobicoke
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| Posted: Fri Feb 20, 2009 3:38 pm Post subject: Best timings for XG @1080p 71.928hz? |
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I'm having problems with image "roll-over" on the left and right sides and dark or light banding on the left vertical edge (some call it raster ringing?) depending on porch size and blanking.
So who has timings that don't have massive porches and no image/raster problems?
What I'm using at the moment-
1920,40,96,240,1080,55,17,97,206269,534
(note: if you want to argue about 1080p on xg, do it somewhere else)
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Fri Feb 20, 2009 9:38 pm Post subject: Re: Best timings for XG @1080p 71.928hz? |
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| Jesse S wrote: | I'm having problems with image "roll-over" on the left and right sides and dark or light banding on the left vertical edge (some call it raster ringing?) depending on porch size and blanking.
So who has timings that don't have massive porches and no image/raster problems?
What I'm using at the moment-
1920,40,96,240,1080,55,17,97,206269,534
(note: if you want to argue about 1080p on xg, do it somewhere else) |
Jesse, because a CRT has finite RETRACE, you are going to run into the fold over issue.
At 1080p 72hz, the only way around it is massive porches, which mean that the porches get cropped, not the active image.
This takes more bandwidth...bandwidth you don't have left over with 1080p 72hz. It's a slippery slope.
I've never really played around with such high resolutions, you'll have to find the best compromise for yourself.
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Jesse S
Joined: 12 May 2007
Posts: 209
Location: Etobicoke
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| Posted: Fri Feb 20, 2009 10:37 pm Post subject: |
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I set my pj back to 1280x720p today. It looks good but 1080p looks better. More detail and depth.
I may try 1440x1080 to reduce the bandwidth but keep the height res.
So I'll need something like 240/240 for the front and back horizontal porches?
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perisoft
Joined: 29 Aug 2007
Posts: 2920
Location: Ithaca, NY
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| Posted: Sat Feb 21, 2009 12:02 am Post subject: |
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| Jesse S wrote: | I set my pj back to 1280x720p today. It looks good but 1080p looks better. More detail and depth.
I may try 1440x1080 to reduce the bandwidth but keep the height res.
So I'll need something like 240/240 for the front and back horizontal porches? |
With crappy lenses that can't resolve any better, I'm running 1440x900p on my barco g808s. 720p is hella coarse, to be honest, unless you're sitting really far back. I'm right around 1.2x screen width and 1440x900, for HD, is sacrificing quite a bit of visual impact, I suspect.
I'd do 48 over 72 if your PJ's bandwidth is anything like mine - a quick look at the tubes running 1080p72 indeed showed the results to be very, very soft.
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MikeEby
Joined: 24 Jun 2007
Posts: 5237
Location: Osceola, Indiana
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| Posted: Sat Feb 21, 2009 12:13 am Post subject: |
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I don't like the scanlines and noise at 1080i96hz. The flicker gives me a headache at 48hz.
Here is the 1080p@72Hz timing I use with positive sync. Yes the pixel clock is very high, but I still manage the 1:1 pattern below.
The pattern @60Hz is slightly better but the motion Judder IMO is really bad. I have a slight amount of gullwing at the top, maybe 3/16" on a 8' wide screen.
IMO its very important to maximize your raster size. I also set the image position to eliminate foldover then use the reference raster centering to position the image on the screen, being careful not to over shoot the edge of the tube.
I've tried all different timings and resolutions and I keep going back to these.
BTW this is all analog, (RGBHV) out of the ATI/Asus 3850 no Moome or Fury. I do have a Box 1021 in the signal path for a gamma boost.
And a couple screen shots from the HD-DVD GranPrix.
Mike
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Doing HD since the last century!
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Jesse S
Joined: 12 May 2007
Posts: 209
Location: Etobicoke
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| Posted: Sat Feb 21, 2009 6:10 pm Post subject: |
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I tried those timings and the raster ringing is mostly gone. Doesn't that vertical back porch seem large? When I looked into the tubes to center the image in the raster there was a very large unused area. It's not as sharp as the smaller timings I pasted above.
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MikeEby
Joined: 24 Jun 2007
Posts: 5237
Location: Osceola, Indiana
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| Posted: Sun Feb 22, 2009 12:07 am Post subject: |
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Jesse, Are you using analog or digital to the projector? I'm analog all the way, no Moome no Fury, IMO with an HTPC they are a wait of money. I do have a Box 1021 for Gamma but it doesn't change the raster at all. I will be honest mine can take a while for it sharpen up. It's watchable after about a 15 minute warmup, but can take 1-1/2 hours to be tacky sharp 
Mike
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Doing HD since the last century!
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Jesse S
Joined: 12 May 2007
Posts: 209
Location: Etobicoke
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| Posted: Sun Feb 22, 2009 1:18 am Post subject: |
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ATI 2600XT thru VGA to Extron 108. Then RGBs to nec. The Extron isn't doing any position control.
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Jesse S
Joined: 12 May 2007
Posts: 209
Location: Etobicoke
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| Posted: Fri Feb 27, 2009 8:35 pm Post subject: |
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I thought those 1080p timings were ok but I'm seeing streaking now. 720p definitely isn't as good and 1080i isn't a good solution. Sigh.
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