Spectral film simulations in ART

Software ART
89

Hi,
there’s another project providing spectral film simulations that has been recently mentioned here, called Spectral Film LUT.
I’ve played with it a little bit yesterday, and it can be easily integrated in ART with the “external 3dLUT” mechanism (described here for the original agx-emulsion).

If anybody is interested, here are quick instructions:

  1. install Spectral Film LUT. I’m going to use a Python virtualenv below:
$ python -m venv spectral_film_lut-venv
$ . spectral_film_lut-venv/bin/activate
$ pip install git+https://github.com/JanLohse/spectral_film_lut
$ pip install matplotlib networkx opencv-python
  1. pull the latest sources from the ART github repo. Open the file ART/tools/extlut/ART_spectral_film.json and modify the following line to use the Python interpreter from the virtualenv above:
    "command" : "python3 spectral_film_mklut.py --server",

e.g.:

    "command" : "/home/agriggio/spectral_film_lut-venv/bin/python3 spectral_film_mklut.py --server",

Now you can load the ART_spectral_film.json file as LUT in the color/tone correction tool:

Screenshot 2025-10-31 at 09.15.56
Screenshot 2025-10-31 at 09.15.562196×1036 2.73 MB

And if you want, you can also put it in your configured CLUT directory to have it appear in the ‘Film Simulations’ tool.

HTH

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