Just to add to the can of worms.

I remember that Krita used to open a Gimp xcf file.
Using Mint 17.1 / Krita 2.9.5 Krita crashes opening one. Hopefully it will be fixed soon.

All is not lost, export from Gimp in open raster (.ora) format and layers are preserved.



Conversion still works.



however:


I do not think there is such an animal even pure yellow in Gimp (RGB 255,255,0) ends up with a touch of cyan after conversion


Exporting images. Export in cmyk as a tiff or a jpeg. AFAIK if you export in Krita as a PDF you end up with a sRGB PDF. Difficult to tell apart from a visual inspection as most PDF viewer will always report the file as RGB. The only one I know at the moment is ImageMagick.

Although I do not use it, Probably the best way is cmyk tiff images into Scribus then save as a PDF.



Did not look at my video did you? That demos CMYKtool as well as separate+
https://www.youtube.com/watch?v=2rby7r771D4

best of luck.

Thanks Rich & Jamac
you are both stars

Resurrecting due to Separate/Separate+ app crash with GIMP 2.10 for/with Windows OS.
Until such time as Separate is updated (if ever)
Easy workarounds (relatively) with Krita:
1. Export GIMP project as a PNG file. Create new project in Krita. Import PNG File into new project and save as
CMYK.

2. Export individual GIMP project layers as separate PNG files, import them into "new" project in Krita. Flatten layers. Export from Krita as CMYK PNG file.