Hello everyone,
I'm not going to ask about how to activate CMYK in the gimp I know that it's
not in there.
It's actually quite a pain in the ass because I work times to times with some
graphiste and most of them are willing to use free/libre software but they
can't or do not want because the gimp can't (or with difficulty) use CMYK
images.
Free software give the freedom to anyone who program to make is own
modification and it also gives this possibility to those who don't know how
to program by having the freedom to ask someone else.
It has been a really long problem and some people are crowdfunding on this
https://freedomsponsors.org/issue/182/cmyk-support
The discussion is here:
https://bugzilla.gnome.org/show_bug.cgi?id=123598
there are also other asked feature look here
https://freedomsponsors.org/project/130/GIMP#/GIMP
Happy hacking