Saved digital images go bad

Discussion in 'Digital Discussion & Q&A' started by keiththirgood, Feb 20, 2012.

  1. keiththirgood

    keiththirgood TPF Noob!

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    Over the years I've found a number of saved digital images go "bad". They acquire stripes and other defects, sometimes minor, often major. These defects occasionally happen right at transfer from the card to my hard drive, at other times they have been opened at least once (often many times) and suddenly they are bad. This happens with jpegs and with Raw files as well.

    I would upload a screen shot to show you what I mean, however, the system will not let me do so.

    Any idea what might be going wrong and how to prevent it?
    Keith
     
  2. Bossy

    Bossy TPF Noob!

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  3. Josh66

    Josh66 Been spending a lot of time on here!

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    They've been corrupted somehow.

    Multiple back-ups on multiple media types is really all I can think of to prevent it...
     
  4. Rephargotohp

    Rephargotohp TPF Noob!

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    Are you using Lightroom? sometimes in Lightroom the rendered preview will go bad even though the file itself is still good. You can delete the cache on that file and a new preview will be rendered
     
  5. keiththirgood

    keiththirgood TPF Noob!

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    I'm using photoshop and Preview on a Mac. However, the program doesn't matter. You can see the damage in icon mode without opening the file.
     
  6. keiththirgood

    keiththirgood TPF Noob!

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    Bossy,
    The thread you sent me to says, regarding uploading photos directly"
    "From the new page the first task is to make an album for your photos to go into, for ease of categorising your photos in the gallery. Click on the "Create new Album" link just above the main bars in the page. In the new window that opens you can enter a title, a short description and also set the privacy settings for the new Album. By default they are not set to private."
    However on my browser, only "My Photos" "My Favorites" and "no messages" show up on that bar. There is no reference to "Create a New Album" or anything else that refers to albums.
     
  7. MLeeK

    MLeeK TPF Noob!

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    failing hard drive is usually the culprit. It starts with a few sectors and blows from there.
     
  8. keiththirgood

    keiththirgood TPF Noob!

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    Interesting idea, however, my files are kept on a redundant raid drive, so that each file is written to two separate drives. It would be odd that the drives would fail on the same files at the same time.
    There is over a half terabyte of files on the raid, and only the photo files are showing any issues.
    I'll look at the raid with hardware tools to see if any significant sectors have failed.
     
  9. KmH

    KmH Helping photographers learn to fish Supporting Member

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    Oops!
     
  10. Garbz

    Garbz No longer a newbie, moving up!

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    Raid provides redundancy against hardware failures. It does not protect against corruption during access or replication in which case your files would be hosed on both drives. Also has it just shown up in picture files because it's obvious? You'd be amazed at the amount of corruption you can get on a computer before you start actually having problems. A document gets corrupt, you lose a letter or two and it comes up as a typo. An image becomes corrupt it shows up. A video becomes corrupt and you may not even notice the dodgy frame.
     
  11. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    I thought that was one of the pros of a raid array.... it can be set up to check one drive against another and find errors & etc.
     
  12. bazooka

    bazooka No longer a newbie, moving up!

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    This has happened to me and I found that when I ran a memory check, at least one of my memory modules was bad so I replaced all of them. The corruption was happening at the time of the transfer from one machine to another.

    Download memtest86 and burn it to a disk or put it on a usb drive and then boot from it. Run the test.

    If the test shows errors, it may be the memory, or it may be the motherboard. Memory is generally cheaper and always easier to replace.
     

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