GIMP Version: 3.2.6
Operating System: Windows
GIMP Experience: New User

List any relevant plug-ins or scripts:
ISO Coated v2 300%

List any ERROR messages you received:
ICC profile validation failed. Color profile is not for RGB color space

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Hi, I am new to Gimp, but so far have not had a good experience and have been going around in circles on this all day. I have now discovered this forum and hope someone can help.

I have a jpg image which is in RGB and I want to convert it to CMYK, colour profile FOGRA39.

FOGRA39 is included in ISO Coated v2 and I have downloaded that.

I go to Convert colour profile. The current colour profile is set at Built in RGB, I set convert to ISO Coated v2, Rendering Intent is set to Relative colorimetric press convert and I get the above error message. What is wrong?

Where did you get the script from and is it for gimp version 3 or the version your using?

GIMP does not natively support full CMYK color space editing, as it is built around an RGB workflow, though modern versions (GIMP 3.0 and newer) include built-in soft-proofing and CMYK export options.

How to Convert / Export to CMYK in GIMP
Use Soft-Proofing (GIMP 2.10 / 3.0): Go to Edit > Preferences > Color Management to set up a CMYK color profile (such as US Web Uncoated or Coated) for soft-proofing your image on screen.

Export as CMYK (GIMP 3.0 / 2.99+): When exporting your file as a JPEG, TIFF, or PSD, look for and check the Export as CMYK option in the export dialog box.

Alternative Plugin (Cyan): Install the free Cyan Plugin (https://cyan.graphics/) to handle standalone or integrated RGB-to-CMYK conversions and channel separations directly.

Alternative Software (Krita): If you need deep, native CMYK editing, export your file from GIMP as a PSD and open it in Krita, which supports full CMYK color space conversion.

Many thanks sallyanne.
I have just been playing with Krita and it seemed to have worked for me. Thank you.