Sharponess of 1640SU scans

Discussion in 'Scanners' started by fred, Jul 27, 2005.

  1. fred

    fred Guest

    Probably a dumb question but I have been using a 1640SU scanner to scan 6X6
    cm negatives with mixed results. The results seemed to lack sharpness or
    seem out of focus although improve with lots of unsharp mask. Recently I
    tried placing the negative directly on the glass and the results seemed a
    lot better. Is this a reasonable thing to do or am I fooling myself.

    Thanks for any advice

    fred, Jul 27, 2005
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  2. Might be worth checking the focus of your scanner. Place two matches on
    the glass in a 'T' shape, with the end of the vertical match on top of
    the horizontal match. Scan that and look at where the optimum focus is.
    It may be that your particular model does indeed give optimum focus
    right on the glass surface.

    Bear in mind that the 1640SU, like all high resolution flatbed scanners,
    is designed to have zero contrast at and above its optical resolution
    limit. This eliminates aliasing when scanning at the maximum resolution
    and yields a natural, analogue-like image, but it means that the detail
    cannot be reproduced with pixel sharpness.
    Kennedy McEwen, Jul 28, 2005
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