Memory card shows old thumbnail pics

Discussion in 'Digital SLR' started by some guy, Mar 21, 2005.

  1. some guy

    some guy Guest

    My memory card frequently shows old thumbnail images yet when I open
    them they are the new ones that have replaced the old ones. I tried
    refreshing the Windows Explorer folder to no avail. If I modify the
    picture in any way the thumbnail shows the most recent version OK. What
    can I do to get the thumbnails to always display the most recent picture
    short of modifying them?
     
    some guy, Mar 21, 2005
    #1
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  2. some guy

    DoN. Nichols Guest

    Well ... which program are you using to view the photos? (I
    guess "Windows Explorer" based on one of your comments. But the
    thumbnails are a function of the program you are using, not the CF card
    itself. (Though the CF card *might* get the thumbnails written onto it
    by the program. However, I would guess that it uses a local disk
    directory of the thumbnails, instead of one in the CF card, since what I
    think you said is that the images whose thumbnails are showing up have
    *never* been on that CF card.

    I don't use Windows for anything that I can do with other
    systems, but I will describe what unix "xv" does about thumbnails.

    When you enter the directory with the images, and hit the
    "Update" button at the bottom of the window, it scans the current
    images, and puts thumbnails in a subdirectory called ".xview". (Any
    file or directory whose name starts with a '.' will not show up in a
    directory listing, unless you add the "-a" (all) option, or unless
    you are running "ls" as root, the superuser.)

    Whenever you use xv itself to move images elsewhere, it
    deletes the local thumbnail and creates one in the ".xview" directory of
    where you are moving it.

    However -- if you delete or move the images with another program
    (e.g. command line operation), that other program knows nothing about
    the ".xview" directory, so the thumbnails remain there.

    But -- next time you fire up xv, it compares the thumbnails to
    the images currently in the directory, and those which do not have
    thumbnails get shown simply as a rectangle with "JPG" or "GIF" or
    whatever in it until you refresh the thumbnails. So -- it never shows
    stale thumbnails.

    However, my camera assigns sequential numbers to the filenames,
    so there is no chance of duplication anyway -- at least until I reset
    the counter at the beginning of the year. (But a previous camera kept
    reusing the filenames, and that did not create problems.)

    So -- I would suggest that you either have to find the file or
    directory which stores the thumbnails and delete it (it may be a hidden
    file or directory, just as the ".xview" directory that xv creates is
    hidden from the default directory listing format).

    Obviously, if the thumbnails were getting stored on the CF card
    itself, the solution would be to not just delete images from the card,
    but to reformat it before taking new shots.

    Good Luck,
    DoN.
     
    DoN. Nichols, Mar 22, 2005
    #2
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  3. some guy

    John Francis Guest

    I suspect you're viewing the images directly on the memory card,
    rather than copying them to a filder on your hard drive. This means
    that Windows Explorer is writing a hidden file (called Thumbs.db, I
    believe) for the thumbnails directly onto your memory card.

    You're also, presumably, using the setting on your camera that re-starts
    image numbering every time you change cards, rather than continuing
    from where you left off. This means that your camera is writing a
    file with the same name as one of your earlier files, but with new
    contents. But it doesn't know anything about the thumbnail database,
    so it just leaves the old thumbnail there.

    If you just delete the Thumbs.db file it will be re-created
    correctly from the most recent images.
     
    John Francis, Mar 22, 2005
    #3
  4. some guy

    some guy Guest

    My memory card frequently shows old thumbnail images yet when I open
    Yes. Using a Dazzle USB card reader.
    Sounds logical. I'll try it. Thanks.
     
    some guy, Mar 22, 2005
    #4
  5. some guy

    bH Guest

    Or just switch of the creation of the Thumbs.db file in die Folder's
    Tools/Options menu...
     
    bH, Mar 22, 2005
    #5
  6. some guy

    some guy Guest

    Or just switch of the creation of the Thumbs.db file in die Folder's
    Couldn't find it. Using Win 2000 Pro. Is it under File Types? Nothing
    in there for .db files that I could see.
     
    some guy, Mar 22, 2005
    #6
  7. some guy

    bH Guest

    Sorry... I'm thinking of Win XP... It allows you to not create the
    Thumbs.db file in the Tools/Folder Options menu item under the View
    tab. One of those advanced settings. Not sure why 2000 would do it.
     
    bH, Mar 23, 2005
    #7
  8. some guy

    some guy Guest

    Sorry... I'm thinking of Win XP... It allows you to not create the
    Well I just deleted the Thumbs.db file and poof - all the pics are the
    latest. Thanks. Works perfect.
     
    some guy, Mar 24, 2005
    #8
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