[FFmpeg-user] free software for lut3d filter files?

[Michael Koch]

Am 02.12.2018 um 14:08 schrieb Michael Koch:
> Is there any free software for creating or editing files for the lut3d 
> filter?

In the meantime I found a nice *.cube generator tool here:
https://generator.iwltbap.com/

My next question is about the lut1d filter. Unfortunately I didn't find 
much documentation about it.
Does it use the same *.cube files as the lut3d filter, or does it use 
different files?
Where can I find a sample or a generator for these files?
How does lut1d work? Are there three different look-up-tables for the R 
G B channels? Or is the same look-up-table used for all three channels? 
Or is there a fourth look-up-table for luminance?

Michael