The Usage entry in the README for the darktable Film Simulation Panel on github says:
“The styles are meant to be applied after Sigmoid with 1.5 Contrast, 0 skew, per-color processing with 50% preserve hue”.
What additional/other guidance should I follow when using Agx in place of Sigmoid?
Before there are a lot of questions about where that Film Simulation Panel is,
I think it’s a user-contributed LUA script (in combination with film-specific styles. So not present in a “default” darktable installation.
That said, if you want to get the intended film simulation, you’ll have to use Sigmoid with the recommended settings. Any change there would move you away from the film rendering.
So would switching to a different tone mapper…
I’m not saying that that’s wrong, it’s just no longer a simulation of the rendering of the selected film…
Also, you will have to be careful with the choice of modules you use besides the style, if you want the “proper” film simulation… Exposure, white balance and color calibration should be safe to use, anything else may mess with the simulation…
Again, you can get decent results with those styles even when using other modules/settings, it’s just no longer the intended film simulation…
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Thanks for this explanation and the cautionary advice- that is very useful. I do like the Fuji’s colour processing and the simulations, within the recommendations from the script author, are quite good, in my opinion. So, given that I much prefer Agx over Sigmoid, I will just have to carefully select which images I can reliably apply the simulations to.
If you want the Fuji filmsims:
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Excellent - I will try them. Would really like Sepia, though…)