Actually I am also a Canon user. Now what does this say about me 
This is mainly Canon, some Fuji: bgl_portraits (@bgl_portraits@pixelfed.pandainthecloud.de) - Pixelfed
This is also mainly Canon: Benjamin Grimm-Lebsanft (@piratenpanda@pixelfed.pandainthecloud.de) - Pixelfed
and some older GRIII pics: GR3 Panda (@gr3panda@pixelfed.pandainthecloud.de) - Pixelfed
Regarding the slider. As it’s the only part we are not following the reference I guess it’s fine to change it again, so go ahead 
I vote for: Replace pre-compression with slope-slider similar to AgX.
I use a similiar curve, but just on the Lightness channel of the Lab color space, no color shifts.
Spektrafilm has the white/black point adjustments btw, maybe that could solve the issue without adding any “unreferenced” features?
I’ll take a look at that
One tiny thing I also noticed - switching the film stock resets the DIR couplers spread and tail sliders back to 20/200, doesnt happen to any other sliders as far as I noticed.
Suggestion: Rename DIR couplers to “couplers” - DIR is unweildy to read and think-speak 
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fixed with the latest commit. Thanks!
Maybe we should get rid of the pre compression slider and just let darktable users use a tonecurve or whatever they prefer after the spektrafilm module? That would be more in the spirit of darktable I’d argue. What do you think?
Thanks for the builds as always and welcome to the Ricoh club. I have the III (HDF) and it has been life changing for me too.
I have a few on a Ricoh GR III HDF + dt-spektrafilm, these are uncropped:
That is not to say I claim any proficiency using a 28mm focal length or the spektrafilm module. Still learning how to edit the images properly
I’d say that the GR raw files are incredible, way better than my Sony’s and Canon’s, in their latitude and colour reproduction. For example, moving the saturation 10% on the Ricoh’s DNG is roughly equivalent to moving it 30% on the Sony’s ARW. This is phenomenal, but I think it comes as a downside for spektrafilm specifically, having you work in the opposite direction (of reducing the effect of the module) a lot of the time. In this thread I think brought it up multiple times that my photos look deep fried, then I decided to test this module against the ARW files and I realised that it was that the DNG files respond too well to the adjustments you do to them, even though the darktable docs/devs claim that the editing should be virtually the same no matter the file (not a critique, just mentioning)
By default I pull half a stop almost all film stocks (or reduce the development time in an equivalent manner), and the Fuji film stocks only become usable when pulled 1 stop (and I pull them 1.5 stops usually). Maybe there are better ways of managing this, but I found that reducing the saturation or the chroma in Color Balance RGB is difficult because the effect jumps too fast from having close to no effect (first 5-7% of the setting) to having too much of an effect (7-13% is the usable range, beyond that the image appears as if it’s video LOG footage levels in how desaturated it is)
The white balance is also an interesting subject, because I believe the GR III (not sure about IV) lens has a green-ish coat, so using the default color calibration daylight setting makes the image too green. Before spektrafilm I used to default to offsetting it with a magenta hue in the RGB Primaries module (around 1.3% to 1.5% of -70deg hue). Now in spektrafilm I usually set the M filtration to -0.5CC. Once again, maybe there’s a better way of doing it via something like lens correction, but I tend to keep my lens correction off, only turning it on for architecture photographs
I’d argue that duplication of functionality is just as much in the spirit of dt as trying not to do that is ;-).
At least for me it is a functionality I reach for with almost every photo which IMHO justifies the additional slider for the sake of UX.
I have been using it recently on a lot of my photos so I would want this slider to stay
I also want the slider to stay.
@ho4 and @Cristian the pre-compression-slider as-is or as suggested by @arecsu (and endorsed by me ) a linear slope slider?
A linear slope slider would be great.
Please test the changed behavior of the slider
after we have settled on the slider I’d like to go into feature freeze mode and start collecting some nice presets for newcomers to the module
That’s an excellent suggestion.
@bazdesh already made some wonderful presets for spektrafilm and I hope he will contribute with some presets here as well.
pack directory moved from .config/darktable to .local/share/darktable for consistency per review request
I don’t have a preference
I posted a pre-feature freeze question in a separate thread here (as it applies to all implementations of Spektrafilm, not only the dt module):
