You can add different modules to the vkdt node graph in the node editor. For shadows/highlights the eq module right before filmsim works quite well in my experience!
Another thing you could try is to edit the balance between film and paper exposure, and experimenting with adding a bit of preflash.
Vkdt doesn’t support opening tiffs.
sorry don’t have much time to work on this currently… the yellowish tint is because vkdt prints with D50. i can add an option to print D65, that turns white to what’s neutral in the rest of the pipeline.
i started a branch spektrafilm-bw with some changes: D65 print, added bw stock, and some normalisation code. the normalisation hurts because it seems simply working with pre-normalised data would be better/more efficient. @niklasiivari’s changes prepare some stuff in shared memory before actually starting the film conversion, so i put the normalisation there to minimise perf impact, still not happy with this though. oh, also being lazy i used a shared mem atomic (not sure that’ll hurt old integrated gpu).
finally, the bw slide stock works fine, but printing uses RA4 and introduces weird colour shifts 
so not ready to merge right now.
right. seemed like an arcane file format. we have support for openexr (which by some standards counts as arcane today too but at least it’s used).
Performance when changing clip is quite terrible.
I have a 5080 with 9700x.
When grading clips,with halation and grain turned on, i can get 15fps playback speed, which is actually pretty good. Rendering fps seems to be around the ballpark too.
But during grading and rendering, when switch clips, there seems to be a long wait to load the ofx, resulting in freezing and extreme low fps in rendering(0.5fps etc).
The more serious problem is, this long loading process causes the actual rendering to slow down too. I can run 15fps render in the beginning. But as the rendering goes on, it would drop to 0.5.
It might be time to start separate threads for different implementations of spektrafilm, or we should get people pointed at the right spaces to discuss implementation specific details, as its starting to get confusing.
After testing on M4 Pro Macbook, can confirm this does not happen on Mac.
Although rendering fps drops to 4-8 fps, it does not suffer from change clip loading stuck.
You seem to be referring to Aedan’s OFX implementation of Spektrafilm. While excellent, it is not really being discussed in this thread!
There is a Discord for that (and a link available on their website).
thanks i see