Highlight/Shadow Values for negative scanning

From: Oliver Rauch (oliver.rauch@rauch-domain.de)
Date: Sun Jun 24 2001 - 01:51:08 PDT

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    Hello.

    I found out some Values that are interesting for scanning negatives
    when your scanner uses analog highlight and shadow functions
    (e.g. umax Powerlook III).

    The values are defined for a range 0% - to 100% where this
    range does cover the full intensity range:

    Negative ---- highlight ---- ------ shadow ------
    Type red green blue red green blue
    ---------------------------------------------------------------
    standard 66% 33% 16% 7% 1% 0%
    ---------------------------------------------------------------
    fuji 64% 33% 16% 7% 1% 0%
    ---------------------------------------------------------------
    kodak 54% 18% 12% 9% 2% 0%
    ---------------------------------------------------------------
    konica 38% 21% 14% 3% 0% 0%
    ---------------------------------------------------------------
    agfa 61% 24% 13% 6% 2% 0%
    ---------------------------------------------------------------

    The values are not exact but they are a good starting position.

    When only one highlight/shadow value for gray/intensity is available
    you should use the maximum (normally red) value of the highlight list
    and the minimum value (normally blue=0%) of the shadow list.

    I hope some people can take advance of this.

    Bye
    Oliver 

    -- 
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