Video card Problems?

Discussion in 'OT Technology' started by Ham Sammich, Jul 11, 2006.

  1. Ham Sammich

    Ham Sammich New Member

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    I just got a new computer 1 week and a half ago. One of my dads friends is an IT specialist so he installed windows XP and all the drivers for my computer. Since I have had it I have noticed on some pictures on the internet they have all these weird lines in them and they picture like goes to the opposite color. Would anyone know how to fix this or if it is the videocard?

    Here is a screen shot of the picture being all messed up in another thread.

    [​IMG]

    Thanks for any help.
     
  2. Ham Sammich

    Ham Sammich New Member

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    Come on no one knows why this is happening?
     
  3. Nefarious77

    Nefarious77 Guest

    Does it happen on all pictures you come across? How about with pictures saved on the computer?
     
  4. Ham Sammich

    Ham Sammich New Member

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    No not all pictures. Very seldom do I see it. When I was looking for new wallpaper on deviantart I found a really nice one i wanted. It showed the thumbnail fine without any lines but when I clicked that and the big picture came up it had lines across the top like in the original post and when I set it as my background the lines were still there.
     
  5. deusexaethera

    deusexaethera OT Supporter

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    That kind of error is the result of a corrupted JPEG file. It's probably not your fault.
     
  6. P07r0457

    P07r0457 New Member

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  7. Ham Sammich

    Ham Sammich New Member

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    Yeah but then when I had my old computer before I got the new one that picture was my background and had nothing wrong with it.

    Wireless ADSL :o
     
  8. P07r0457

    P07r0457 New Member

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    This may be the problem! I know it sounds crazy, but hear me out. Back about 7 years ago, I was a lowly service tech working for another company doing PC repair and also a contractor for the local telco. ADSL was just coming into it's own in Southern California as an affordable and viable high-speed alternative to ISDN. However, as users were getting service, we noticed anomilies specifically in the realm of corrupted binaries, especially apparant with JPEG images. This was a result of the digital > analog > digital conversion. JPEG is a non-correcting format. In theory, a TCP packet should be error-checked and discarded if found to not be valid. However, we were finding a small percentage of packets were not failing these TCP checks, and when assembled (especially with JPEGs) they were viewed as "valid", even though they had artifacts that were easily detected by a visual glance. This seemed to only affect early ADSL subscribers, and has never affected digital cable subscribers. The problem has largely gone away as telcos have worked to solve these annoyances. But when I read your post it really made me flash back to that period. It just so well described what I had seen.
     
  9. deusexaethera

    deusexaethera OT Supporter

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    Huh. I wonder how the data could be corrupted without failing the integrity check. Must be an even exchange of 1's and 0's within the packet, or something like that.
     
  10. P07r0457

    P07r0457 New Member

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    well early ADSL used a digital>analog>digital conversion. This posed a problem due to signal degredation and noise/interferance because 0's and 1's could be mis-read when converting from analog back to digital. JPEG is a very sensitive format that provides almost no error checking outside of a valid header... So as long as the TCP header was received correctly, any corruption in the body of the packet could translate to the JPEG image.

    As I mentioned, however, I thought this had been fixed. I recall several instances of randomly-corrupt binary downloads (such as .exe's), as well. But due to the "take anything" nature of JPEG, the small corruptions will be accepted, and displayed, but the image is altered greatly.

    The effect is not unlike a data recovery operation on a fragmented drive... Images are often recovered and check out as "valid" but look deformed like what was posted. This is due to a similar effect.
     
  11. Ham Sammich

    Ham Sammich New Member

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    Ok thanks alot. That solves my problem. :bigthumb: I thought I didn't install some drivers properly or something.
     
  12. deusexaethera

    deusexaethera OT Supporter

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    I wonder if this is why the MPEG-encoded movies on my hard drive have an annoying tendency to disintegrate after a couple of years. It only happens with MPEGs.
     

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