… who knows ?
20200620-0020.dng.xmp (11,4 KB)
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challenge.1.dng.xmp (9.9 KB) darktable 3.2.1
An attempt to get the Kodak Vivid Colour (portra?) look. Hard to visualize what the prints from back then looked like… Definitely less contrasty compared to the current (digital) prints.
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Love the edits everyone. Each edit feels very different and each has interesting color and contrast choices.
With Filmulator.
- Exposure Comp +1.6
- Shadow Rolloff Point 0.0028
- White Clipping Point 0.75
- Shadow Brightness 204
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Glad to see that I’m not the only one that is still playing with this one 
I gave my old love, Kodak T-MAX 3200 a try.
This was done with GIMP.
I still think that the grain in digital is to even (spread and granules). If anyone knows how to create more realistic (more uneven) looking grain please enlighten me!
Gave it another go myself because it is really fun to be honest. I spend a lot of time trying different combinations of stuff to shift things. Though I have not tried to emulate a particular film directly. This one I have done I tried to make it a bit less warm but also bring magenta into the shadows similar to the one Kodak film I can’t remember the name of.
20200620-Macro-0004.dng.xmp (9.3 KB)
Yes grain in digital is a bit too even. I used the grain module in dt. The only grain I have seen that tends to bring the film like grains to digital without the uniformity issues is Capture One and the DxO Film Pack. This is because they are maping the grain to the image so grain only ends up where it should and the grain maps are from actual film. dt does a good job as well mapping the grain but it seems to only have one pattern.
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I do think I have a way to do it but it will take some time to create it: One could create a image that contains random noise (think old TV noise/static). This is inherently random and does vary in size. It does need to be fairly big in size (for me it should be able to easily cover a D750 RAW (FX roughly 6100X4100).
This image, as a new layer and after using some filters/effects, can be merged (grain merge?) with the below layer. Works in theory…
could put the grain on a 50% gray layer then use Overlay + Luminosity mask. Still a pain. I always found grain a bit easier with something like Photoshop if doing it manually because of blend if allowing you to mask it into the realistic areas quickly. This method can also be used with film grain overlays that were taken with film cameras against 50% grey cards that you can download off the internet.
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Never used, or played with, Lightroom and/or Photoshop and am thus not sure if GIMP is up to par. That is if comparing them is wise to begin with, one tends to know more about one over the other.
(Layer) Mask and blend modes will definitely be needed to get a good result. I really need to give my (and your) idea a try. So little time, so many potentially nice things to do 
IMO, the one major area where Photoshop outstrips GIMP is preparation for printing. And GIMP may have caught up some since I dug into the comparison.
One thing Gimp can’t do is underlying layer blend if. Does not really matter as a luminosity mask can do the same thing if if you target it to the correct tones and use levels to tweak. Not having adjustment layers is bleh but it doesn’t stop you from doing the same kind of edits.
I’m hoping a new module or plugin or something comes of this great work one day, but in the mean time my preferred method is using the Add Grain filter in G’MIC. I quite like the TMAX 400 option, and find the Overlay mode to be quite a bit more natural than the Grain Merge default.
I remember reading a paper about Phase One experimenting a Filmulator-like approach, literally simulating grains and their growth, to mimic the effect of real film grain.
I wonder if I could hack something similar into Filmulator…
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