As a user, I would like to be able to use *.cube 3D LUT files to modify pictures.
Currently, it is possible to import custom *.png 3D LUT files but it is impossible to import *.cube files which are a quite popular format. It would be nice to have this possibility. The codec must be implemented. There is the topic where I asked about it: http://digikam.1695700.n4.nabble.com/Lut3D-in-digiKam-td4695429.html
There is a possibility to import *.cube 3D LUT file and apply it to pictures using 3D LUT option in the editor.