fwiw people have already found ways to ingest 3d luts into our colour look up table module:
https://www.youtube.com/watch?v=m_cLCL5PJk4 -jo On Fri, Oct 14, 2016 at 3:03 AM, Tobias Ellinghaus <m...@houz.org> wrote: > Am Donnerstag, 13. Oktober 2016, 12:53:12 CEST schrieb Seweryn Niemiec: >> Hi >> >> Colour transformations using 3D LUTs (Look Up Table) are popular in >> cinematography but no so in photography (probably one of the causes is a >> lack of support for it in software). I use them a lot and I usually drop >> using Darktable for those cases and switch to Natron, but this solution is >> far from perfect (I love Darktable for many reasons). >> >> LUT transformation have to applied in pipeline after basic exposure and >> colour correction and before some other luma and colour corrections. > > Well, there are several places where a LUT can be applied. Once in the > beginning, to get you recorded video data to a known state (kind of replaces > input color profile), then there are final looks LUTs that are to be applied > in > the very end (to make the linear pixels look ok, adding a gamma curve and > maybe some film emulation, so basically the final grading). And then there are > intermediate ones like you ask for. > > We discussed that a few times internally and while I would like to support > that, there is the problem of WHERE to have such a module in the pipe. Or if > we should add LUT support in a single new module plus the the input/output > color profile modules? So many options ... If you have more insight I would > like to hear about it. > >> AFAIK, ready to use implementation of this transformation is provided by >> OpenColorIO library via LookTransform function. It is used in most >> compositing programs (like Natron, Fusion, Nuke) and reads all popular file >> formats (3dl, cube, csp...) > > I wouldn't like to add that dependency as it's a rather big one and somewhat > opposed to the ICC based workflow we use. But we don't need it anyway, I > already have written some test code that reads cube files and applies them. > >> A have created issue for this https://redmine.darktable.org/issues/11217 >> >> Was there in the past any discussion about such iop? > > Tobias ___________________________________________________________________________ darktable developer mailing list to unsubscribe send a mail to darktable-dev+unsubscr...@lists.darktable.org
