The thing I am having a problem with is the colour shift in post processing
when I try to compensate for underexposure. Admittedly some of the cases
are a bit extreme and I should probably dump the slides; however I’m
finding a lot of mild underexposure and I wondered if ‘calibration’ would
ensure I’m getting the right brightness in the scans. Vuescan has an
adjustment for ‘brightness’ but it’s a bit trial and error.
Thanks for the replies...
Jez
On Mon, 10 Feb 2020 at 23:13, Mike Gordon via olympus <
olympus@xxxxxxxxxxxxxxxxx> wrote:
> > To profile the scanner itself, so that differences in films are retained
> > in the scans, is a trickier business.
>
> Silverfast Negafix is a "soft" profile and they don't have targets in a
> good number of current emulsions. It does retain the original spectral
> sensitivities of the film which can be later tamed in post if desired.
> AGafix in AK does a very nice job of these. Mooseafix is excellent too
> but the owner doesn't need too much extra work. Curiously the old Portra
> 160 NC with a "hard" profile was quite accurate and nice for landscapes
> though the original prints were flat---sublime for portraits though. I
> have attached an email from Silverfast tech when I enquired about soft
> profiles for other films:
>
>
>
> "Dear Mike,
>
> we can only create Negafix profiles, which are combined scanner/film
> profiles, on emulsions our
> supplier prints targets on. So unfortunately we do not have a Portra 160
> target.
>
> But you could take a profile from the old Portra emulsion and adjust it
> manually, save it
> (in the Ai Studio version) and build up your own personal profile library.
>
> Vuescan lets the user himself photograph an IT8 target and then measure
> out the color fields on
> it. I did never try that but can imagine, that this kills the character
> of the material because it is
> a really hard profiling (again: not really sure about this). Additionally
> the developing process and
> the exposure value of the film would have a really big influence on this
> as well.
>
> Our NegaFix profiles are made out of three targets (-1, +-0, +1 exp) and
> a powerful mathematic algorithm which keeps the typically film effects of
> the emulsion. There is also a color cast removal inside of Negafix which
> can be switched on or off for creative photography that
> sometimes really likes to keep color shifts through the choice of film,
> filters or cross developing.
>
> Maybe you give our demo version a try and have a look at the NegaFix
> dialogue especially.
> When getting your demo serial, choose the Ai Studio version to get all
> expert adjustment
> possibilities enabled.
>
> Kind regards
> Nico Schneider
> - LSI Support Specialist -"
>
> I say let Velvia be Velvia.
>
> Mika-no-longer-fix, (until new scanner), Mike
>
>
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