Hi Damien,
These are some of the workflow here for C41 35mm negatives
I used an olympus M4/3 with a Rodenstock Rogonar-S 1;2.8 50mm at f/8
A motorized microfocusser made 6 raw images, 3 on each side of the focus
The 12 bit raws were converted to 16 bit tif images and processed on linux by a bash script.
Here is the resultant aligned and contrast stacked tiff:
( these are 100mB tiffs so I disabled downloads)
https://app.box.com/s/kzkubmu0yfl5txil51kl41nmv2bicawr
Then inverse gamma corrections for RGB channels were applied to the negative before inversion, and it was then inverted:
https://app.box.com/s/3ac47xkdo4z25l1bh0rcg1is1nnho8e2
Then the image was color balanced by cinepaint, a 16 bit GUI post processor:
https://app.box.com/s/n5vk2re1xqt4bnjka4ni16mcmysc2oby
I see that others are getting good results with a much less elaborate workflow than mine, however my workflow is automated up to the cinepaint step.