Dear MikeD56.
Thanks for the interest in our SilverFast Software.
From my memory the term "Safety Film" was introduced by kodak when the film passed the standard burning test for safety film described in ANSI/ISO IT9.6-1991 (R1996). This that Ektachrome,
Kodachrome and B&W Negative film carried this term.
Please change to Expertmode in the
Negafix dialogue and try the Auto Mask detection. Yiu may also edit the histogramm and curves manually. Afterwards you can save the settings as andividual
Negafix Profile.
Kind regards.