CMYK color mode Gimp 2.10

[ThirdEye]

Thanks Rich. I guess somehting doesnt work, because choosing export does not open cyan from my Gimp 2.10.14. But nevertheless, I think I have to look for another way anyway, because I wanted to get an CMKY Histogram and that will probably not work, because you've said GIMP is an RGB only program. I also get an error inside Cyan if I try to open the test-image (jpg) there. So I will try some whole different programm to achieve my goal.
But thanks again for your effort and have a nice day