Fujifilm Auto Settings for Darktable

This repository contains styles and scripts and LUTs to automatically read and apply

• Film Simulation
• 2:3/16:9/1:1 crop
• DR100/DR200/DR400 mode

Installation

Install exiftool and make sure it is available on $PATH.

Go to Darktable's settings, in the tab "processing", set a 3D lut root folder. Copy the supplied LUTs into that directory, such that e.g. the Provia LUT is at $3DLUTROOTFOLDER/Fuji XTrans V8/provia.png.

Import the styles in the styles subdirectory. The film simulation styles rely on the LUTs installed in the previous step.

Activate Darktable's script manager from the Lighttable view in the bottom left.

Copy fujifilm_auto_settings.lua to ~/.config/darktable/lua/contrib/, then start it with the script manager. It should now automatically apply the styles to any imported RAF image.

Debugging

Start Darktable with darktable -d lua to debug. You can run the lua script manually by binding a keyboard shortcut to fujifilm_auto_settings in Darktable's settings.

How it Works

The lua plugin calls exiftool to read the film simulation, crop mode, and DR mode from the RAF file. It then applies one of the supplied styles, and sets an appropriate tag.

Film Simulations

The following styles apply Fuji film simulations from https://github.com/bastibe/LUT-Maker:

• acros
• acros_green
• acros_red
• acros_yellow
• astia
• classic_chrome
• eterna
• mono
• mono_green
• mono_red
• mono_yellow
• pro_neg_high
• pro_neg_standard
• provia
• sepia
• velvia

These styles activate LUT 3D, and set the appropriate LUT.

Crop

The following styles apply a 16:9/1:1 crop:

• sixteen_by_nine_crop_portrait
• sixteen_by_nine_crop_landscape
• square_crop_portrait
• square_crop_landscape

2:3 crop does not have its own style, since Fujifilm images are already 2:3.

The crop styles are not pixel-perfect.

DR Mode

The following styles apply for DR200 and DR400:

• DR200
• DR400

As far as I can tell, the DR modes reduce the raw exposure by one/two stops to make room for additional highlights, and increase the tone curve for midtones and shadows to compensate.

The supplied styles implement this using the tone equalizer, by raising the -8 EV to -4 EV sliders to +1 EV, then -3 EV to +0.75, -2 EV to +0.5, -1 EV to +0.25 EV, and 0 EV to 0 EV (for DR200; double all values for DR400). I experimented a bit with various preserve details functions, and found eigf to look most similar to Fuji's embedded JPEGs, so that's what the styles use.

Of course this can only work for properly exposed images, and even then might not be perfectly reliable. But it usually gets the images in the right ballpark in my testing.

Changelog

2022-07-20 Only call exiftool once, to speed up operation
2022-07-20 Added monochrome LUTs and styles
2022-07-20 Various fixes by Teh-Lemon
2022-07-17 Updated LUTs with correct indexing, for markedly improved colors.

Known Issues

The LUTs training data does not contain saturated colors beyond what is natural. Even though some intelligent extrapolation is applied, pushing saturation too far may result in incorrect colors. Apply a parametric mask that excludes high Cz if this becomes a problem.

In particular, oversaturated colors will turn grey in the sepia LUT.

License

I place these scripts and LUTs under the terms of the GPL license