Choosing Gamma-Gradation setting for neg scanning; Ian Lyons

[MicroSF6]

dear forum,

does anyone know whether the method explained in "Optimising the Scanner Response (Gamma-Gradation)", a tutorial by Ian Lyons, applies to scanning negative transparencies, as well as to scanning positive transparencies? I have followed the tutorial carefully, and I suceeded in using the gray scale of a silverfast IT8 target transparency to help me choose the best gamma for my microtek 120tf scanner (by the way, when i wet-mount with kami fluid and optical mylar, the best gamma for my machine turns out to be 1.94). but of course this target is a positive transparency. (i don't have a negative transparency grayscale, and don't know whether such a thing exists or whether it makes sense to wonder this!) Should the gamma setting i chose for positive transparencies apply equally to my negative-scanning workflow?

thank you,

mark woods

[LSI_Noack]

Dear Mark

you might want to ask Ian himself:
profile.php?mode=viewprofile&u=6

Best regards
Sonny Noack
- tech support, LSI AG -

[ilyons]

Should the gamma setting i chose for positive transparencies apply equally to my negative-scanning workflow?

I doubt that the gamma gradation curve for positive type images is valid for negatives. Negatives are based on NegaFix and each film has it's own unique contrast and colour response.