Portra Silverfast/Negafix Algorithm

Stealth3kpl · Mar 15, 2011

When did Silverfast last update their Portra algorithm? I'm getting magenta reds in version 6.6.2r.3a of Silverfast SE. How do people get around this problem? I had a little more success using one of the Agfa algorithms and messing with the colordisc. You'd think they'd get around to sorting the maths for the most popular films available.
Pete

timparkin · Mar 15, 2011

I've never been that happy with the conversions using silverfast .. I found using curves to set the min/max points within the epson software provides a better result.. I'm just writing an article documenting my findings.. Keep an eye on Landscape Photography and Photographers | Great British Landscapes next week

Stealth3kpl · Mar 15, 2011

I'll look forward to it. At the moment I'm doing this or using ColorPerfect or Silverfast. It would be good to settle on a system that I'm happy with.
Can you update this thread when you've completed the page. Thanks.
Pete

Kirk Gittings · Mar 16, 2011

i haven't used SF in awhile, but there is a way to apply the profile, tweak it, and save it as a preset. My tweaked profiles were pretty effective. I photographed a Macbeth Color board and tweaked the profile for that then saved it and applied it to all subsequent scans from that film type.

Tim Gray · Mar 16, 2011

In my experimentation with Silverfast, I seem to remember that there was an 'advanced' section in Negafix that let you set the profile manually. I'd just use that and save it as a profile. I think you might need one of the more expensive versions of Silverfast for this.

JS 2011 · Mar 19, 2011

Do Calibration first - Monitor and Scanner .
Sometimes scanner needs a new Bulb.
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I do have my own made Profiles
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Every Lab has his own C41 or E 6 Process outputs / within 10-15 % /

Tim Gray · Mar 20, 2011

Oh, and Silverfast isn't going to update this as far as I know. I've read that the company they used to use to make these profiles is no longer in existence. Good luck.

Negafix profile for the new Kodak Portra 400 : HiRePP - NegaFix - Profiles

DrPablo · Mar 28, 2011

I use Silverfast to run my drum scanner, and I get the best results with color negs -- regardless of film type -- if I scan as a positive and use the autocorrect function to remove the color cast. I usually widen the white / black points just to give myself a little bit of editing latitude. Then once I have the TIF open in Photoshop I invert the image, run curves to optimize contrast, and then do minor color adjustments if needed (usually just minor warming or something). I find this workflow much better than using the film-specific profiles for negatives.

Portra Silverfast/Negafix Algorithm

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