Blender AgX in darktable (proof of concept)

[mikae1]

@s7habo

I have absolutely no idea how to get any good result with custom curves in log only mode.

Has anyone managed to do this and what needs to be considered?

@kofa

I have also not had convincing results, but did not try it for long. If the consensus is that it’s useless, I’ll remove it. Let’s see if anyone comes up with results proving it should stay.

Was hoping that I’d be able to do something with it using rgb curve, but that was optimistic. This is what you’d use LUTs for (if darktable had the feature).

I was able to use to use some of these log to rec 709 LUTs to get it in the right ballpark:

But yeah, you’d want to specify what log to output, like Arri LOG-C or Sony S-LOG3:

Then follow it up with something like ImpulZ LUTs for Arri LOG-C or Sony S-LOG3.

Again, darktable does not handle 1D LUTs, which makes a proper LUT workflow more or less impossible (or extremely cumbersome).

The right place to add this feature would perhaps be the LUT 3D module though, as @Xavier_Bourque describes in the GitHub issue. But that seems it won’t happen as the issue is marked “not planned”. I’d be forever grateful to be able to work with my video log LUTs in darktable. I guess a dropdown of common log LUTs to accompany the “logarithmic tone mapping only” checkbox.