Portra Silverfast/Negafix Algorithm

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Stealth3kpl

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Joined
May 15, 2010
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25
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35mm RF
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 :sad:
 
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Stealth3kpl

Stealth3kpl

Member
Joined
May 15, 2010
Messages
25
Format
35mm RF
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

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Joined
Mar 21, 2006
Messages
84
Location
New Mexico
Format
4x5 Format
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

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Joined
Sep 2, 2006
Messages
1,882
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OH
Format
35mm
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

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Joined
Feb 4, 2011
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32
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between
Do Calibration first - Monitor and Scanner .
Sometimes scanner needs a new Bulb.
***
I do have my own made Profiles
**
Every Lab has his own C41 or E 6 Process outputs / within 10-15 % /
 

DrPablo

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Joined
Aug 16, 2006
Messages
814
Location
North Caroli
Format
Multi Format
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.
 
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