So I’ve been experimenting a lot with film simulations. Initially I used ICC profiles in darktable. But I never got good results.
In my opinion, the HaldCLUTs for fuji filmsimulations also deliver poor results in comparison to the jpg.
I think there are two fundamental problems here:
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A HaldCLUT assumes that it gets pixels in a certain basic state. This must correspond exactly to the one that was also used when the CLUT was created.
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Creating a HaldCLUT is a simple process. Tone value and color changing operations (eg the filmsimulation) are applied to the Hald_CLUT_Identity_12.tif file and the result is saved as png.
The problem with this is getting Hald_CLUT_Identity_12.tif into the Fuji camera as a RAW to apply the filmsimulations to it.
I have had much better experiences with darktable-chart.
There is also the option to correct the colors in the color-lookup-table module if necessary.
see:
If you want then you can load Hald_CLUT_Identity_12.tif into darktable, apply tonecurve and color-lookup-table from a film simulation. The result can be exported as png which will serve as HaldCLUT.
This could replace the tonecurve and the color-lookup-table with the 3D-LUT module if the order of the pixelpipe fits.
The question, however, is what has been gained by doing so.