I am tryin' convert my favorite luts from vision colors (osiris m31 rec 709) to icm or icc to work in capture one.
Briz Lut converter have a easy interface for that task, but Spaceman is hard to use.
Right now I can make icc files, but results is not nice . . .

https://www.dropbox.com/s/4wu7zjvysqtx0of/IMG_0001.jpg?dl=0

some ideas?

Thanks in advanced!

As per the User Guide, that is because you are using an un-licensed version of SpaceMan.
See: https://www.lightillusion.com/spaceman_manual.html

As is stated there, the 'posterisation' is a watermark embedded into the ICC.

We have a lot of Capture One users working with SpaceMan - it works perfectly.

Steve