Now, I’m not saying that the original creator ran a program through those presets and created the haldCLUTS that way, but he just might have. I hate to be “that” guy, but the film simulations included on the rawpedia page very closely match the names of some of the VSCO’s preset stocks. I forget if the RT module has tools to interpolate and otherwise reduce the possibility of the result being super unpalatable, or is capable of triggering all of RT’s warnings and making the user panic. Not all of them could and should be applied to all images, particularly the more extreme or lopsided simulations and/or raw images. I guess the first order of business is to place simulations into these buckets.Īnother thing that could be useful in documentation is to have a description on the limitations of each simulation. Further idealization, leaning more into the author’s artistic tastes and opinion, which can involve Frankenstein’s simulations, adding features to technical simulations to stretch their potential or going in a completely different direction.Same as above, but an idealized version to overcome actual or perceived limitations such as going from analog to digital, adapting to viewing conditions, following a manufacturer or brand’s digital style, or changing the temperature or mood.Variations of what an actual physical combination of film, photographic hardware and darkroom process could achieve (that could be quite broad, since one can do a lot of unconventional things in and outside of the darkroom).

At the end of the day, they are looks applied to images that didn’t start out that way. I may have said this before: the simulation depends on its author’s goal. I don’t remember the contents of the thread, but I would say, from your quote, that I used many shoulds.

GitHub - pixlsus/RawTherapee-Presets: PP3 presets for RawTherapee.

adds rawtherapee collection and several others.

mentions: Fuji Film Simulation Profiles – Stuart Sowerby → sadly, no explaination about what those Fuji X-Trans III LUTs were based on.

GitHub - cedeber/hald-clut: A collection of HaldCLUT.

The Largest Collection of Presets/Profiles brought together – Open Source Photography which hosts several interesting articles.

take your favourite colour checker, your film stock, shoot it in whatever conditions you want to approximate/replicate on digital, match it to your digital capture and create a new HaldCLUT. Now, apart from the scientific grounds for the previously mentioned collection, I’m also interested in HaldCLUT attempts that were made using this approach: The Peter Principle - Out of Focus: Emulating analog film digitally Part 2 - Emulation process

Classic Chrome HaldCLUT like the X-T2 for RT.

Film emulation/simulation, with contributions.

Pat David’s answer suggests that the Portra emulation is not actually trying to match Portra particularly well, which might explain the OP’s observation. Portra 400 was likely a combination of multiple other efforts tweaked to something pleasing. The sources should be documented in the source code. We have lots of talented people who make these cluts, some with actual reference material. The simulations should match pretty closely. In The source of film simulations, was saying: how confident are the authors a given film simulation HaldCLUT is as realistic as possible?) of certain looks? Is there a place I should look at to find some documentation that will help assess the “validity” (i.e.

Were you, contributors, working off of already inverted scans? Did it involve colour checkers (CC24, 48 or more)? In your source images, to what degree was the processing subject to interpretation? I’d be glad to hear what kind of images were used as a base for a given look. The number of film stocks available in the RawTherapee Film Simulation Collection is impressive. Unfortunately the RawPedia article about the module omits this part. With that said, I’m very interested in the process, the choices and the tweaks that were made to create so-called “film simulations”. And it’s only recently that I’ve started playing with the film simulation HaldCLUT module for my “purely” digital shots. Especially been shooting mostly film (and more recently scanning and inverting it in RT with the film negative module).

Presets for rawtherapee