Re: SnapScan

From: Oliver Schwartz (Oliver.Schwartz@gmx.de)
Date: Thu May 04 2000 - 09:18:01 PDT

  • Next message: Steffen Kluge: "Re: SnapScan"

    > > I have an Acer ScanPrisa 620 UT. It works, but the RGB offsets are noticeable.
    >
    > Maybe the overhead (transparency unit) lamp *needs* special
    > calibration? The manual for the Prisa 620ST states that when
    > scanning slides or negs you must use the supplied mask and you
    > must leave the calibration window in this mask unobstructed.

    Yes, that's correct. And of course I'm using the mask in transparency mode. I
    have the impression that the calibration is done by the firmware - at least the
    trays move to the calibration area before each scan.

    The offsets appear in flatbed and transparency mode, though.

    However, the RGB offsets as I understand them are not an offset in value but a
    spatial offset. E. g. if you scan a black square on white background in
    color mode it doesn't have sharp edges but maybe a blue edge on one side and an
    orange edge on the other. Just try it.

    Oliver

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