My Photoshop course continues and in the classes where my homework was targeting the computer display my plan worked flawlessly: I used GIMP to do all the work and when done just saved as .PSD, I enjoyed the experience a lot. Now this strategy hit a roadblock: I have to create some stuff for print, as CMYK files in .PSD format. Total failure.
To be honest, I pretty much expected that, I know GIMP misses those features, I know they are listed in a dusted TO DO somewhere and I know at some point they may get implemented. To be totally honest, if I have to do such graphic things like book covers or posters, GIMP is not my first choice, I would prefer to use Inkscape, since I like better its workflow and thing vector graphics are better suited for the task, but it has the same CMYK problem, and I know the more appropriate job for the task is Scribus, it will create print-ready files.
But that is out of the scope, when I do my own stuff, I choose my own tools. For now I had a clearly defined homework: create a design as CMYK .PSD file. A good opportunity what work and what does not in GIMP.
rest here