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Windows 7: video artifacts - need assistance please

30 Sep 2010   #11
corleydad

windows 7 pro x64
 
 

i have attached 2 files of screenshots taken running gpu-z gpu stability test - hopefully you can see red edges in the video




Attached Thumbnails
video artifacts - need assistance please-red-edge-artifacts.jpg  
Attached Images
video artifacts - need assistance please-8va.png 
My System SpecsSystem Spec
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30 Sep 2010   #12
corleydad

windows 7 pro x64
 
 

ok - now here is a screenshot from the same connection to a 22" monitor. no red artifacts! Everything was left the same I merely unhooked the dvi cable from the tv and plugged it into the monitor. I guess the tv is doing somrthing to the incoming signal but I don't know why.


Attached Thumbnails
video artifacts - need assistance please-no-red-artifacts.jpg  
My System SpecsSystem Spec
30 Sep 2010   #13
fseal

Windows 7 x64 Ultimate
 
 

Well a couple of things about "TV"s..

1) By default all consumer TVs have a large amount of what it called "Red Push" which means that the red channel is overdrivin. TV manufacturers seem to think (and they may be right) that "most" customers enjoy a warmer picture. A lot of us though hate it and on some sets, it's not possible to compensade for the red push without getting into the service mode setup on the tv.

2) I have had poor luck using the DVI input on my 52in plasma. The component input and (more recently) the use of the HDMI input from my video card produces a much less "hot" image and overall a much better looking one (red push aside).

So it /may/ be that the TV is merely highlighing artifacting that is already in the video by pushing the red to much higher levels than they really are and thus now much more noticeable than when put on a normal monitor.

Another possibility is that the TV is telling the computer something odd thgough the DVI mode query that is putting your card into a mode that is not quite actually compatible with the TV or something.

Upshot is, if you have the ability, use the compunent out or HDMI out on your video card instead of the DVI and it may work a lot better...
My System SpecsSystem Spec
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30 Sep 2010   #14
fseal

Windows 7 x64 Ultimate
 
 

P.S. I actually can't see a difference between the two screen shots. Can you be more descriptive of where to look for the problem?

I actually wouldn't think there would be a difference by taking a screen shot since that takes the data out of the video card buffer directly even if there was no screen attached at all

Was thinking you would have to take a photograph of your TV with a camera to really see the artifacting.
My System SpecsSystem Spec
30 Sep 2010   #15
corleydad

windows 7 pro x64
 
 

Thanks for the information. The red "edging" type artifacts seem to be very random and don't just appear in red areas of the screen. It's like it has a problem where there are color shifts in the image. While the video card only has dvi outputs I can get a dvi to hdmi adapter and see if that eliminates the tv issue since it wouldn't "think" it is receiving a computer signal. Does that make any sense?
My System SpecsSystem Spec
30 Sep 2010   #16
Lordbob75

Windows 7 Ultimate x64, Mint 9
 
 

He received no video card artifacts. The problem lies with his TV.
Can you try another cable or type of cable?

~Lordbob
My System SpecsSystem Spec
04 Oct 2010   #17
corleydad

windows 7 pro x64
 
 

update - bought a dvi to hdmi adapter and plugged it into the tv - NO ARTIFACTS! However the 1920x1080 1080p resolution is too big for the screen - must really overscan! I had to set the screen resolution to 1768x992 to fit it on the screen
My System SpecsSystem Spec
04 Oct 2010   #18
fseal

Windows 7 x64 Ultimate
 
 

Cool!

And yeah in HDMI or component mode it overscans :/

Another good thing about using the hdmi I found is that FINALLY you can use a TV as a secondary monitor and if you turn it off and reboot your machine the Windows 7 doesn;t rearrange your desktop Something it does in DVI mode with nvidia and ATI. (Unless it was actually a super recent driver fix from nvidia that coincided with my swap to HDMI)
My System SpecsSystem Spec
04 Oct 2010   #19
corleydad

windows 7 pro x64
 
 

Thanks to everyone for all the help and suggestions. A secondary benefit of the hdmi use is that I can do a split screen and have both my HTPC screen and the Antenna feed for tv at the same time!
My System SpecsSystem Spec
05 Oct 2010   #20
Keiichi25

Windows 7 Ultimate x64 and Home Premium x64
 
 

For future reference, when trying to show artifacting, never use a screen shot.

The computer is the one taking a screenshot, so it will take a picture of what it will be outputting to the user. The problem is, what it believes it is outputting and what the user sees is going to be different due to many factors, thus, we will not tell the difference from what you posted from one way or the other, cause it looks the same.

You should take an external reference picture, IE: Use an actual camera. That way, we can see what you see versus just what the computer thinks it is doing.
My System SpecsSystem Spec
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 video artifacts - need assistance please




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