Different results each scan

Discussion in 'Scanners' started by John Jameson, Jan 19, 2006.

  1. John Jameson

    John Jameson Guest

    I'm scanning a good 35mm slide using a HP4890, at 1200dpi and 300% (or other
    combinations such as 3600dpi and 100%). I've turned off all scanner
    processing (no sharp, no colur adjustment, no levels adjustment, etc.) as
    I'm using Photoshop to post-process.

    When I look at the detail at high zoom there are obvious differences between
    the scanned images. In particular the ability to differentate fine detail
    in the enlarged image varies alot - some images are just a blur while others
    show good detail. In theory this shouldn't happen !!

    Also I scanned a slide placed directly on the glass (not using the TMA), and
    for one slide the fine detail was very clear - although another slides
    scanned without the TMA were less clear.

    Any thoughts? TIA.
    John Jameson, Jan 19, 2006
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  2. I'm not that familiar with the HP4890 but I had a similar problem with my HP
    ScanJet 4C until I took it apart and cleaned the rails. Perhaps the head is
    not moving at a constant speed.
    Gord Schindler, Jan 19, 2006
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