No real way with Gimp 2.8, and to be honest that old plugin has a limited life. It will take a re-write of the code to work in the next version (2.10).
Gimp is 100% RGB, so while separate+ can open a CMYK tif and export a CMYK tif/jpeg, any editing is in RGB. Its use is as a final export when a printing company requires CMYK.
Many now accept RGB images so it is worth checking. Large photographic prints using colour laser printers produce great results although they expensive.
If you look up RGB versus CMYK gamut you might get some information such as the first couple of pages here:
https://support.dma.ucla.edu/help/tutori..._guide.pdf
That shows the range of available colours for printed work is that much smaller, so some colours typically bright colours, are not available.
For CMYK it is best to start as you mean to finish. Apart from expensive editing applications, the free one to go for is Krita. https://krita.org
Your work in Gimp is not lost. Krita can open a RGB image and convert to CMYK (with the same restriction on gamut).
Gimp is 100% RGB, so while separate+ can open a CMYK tif and export a CMYK tif/jpeg, any editing is in RGB. Its use is as a final export when a printing company requires CMYK.
Many now accept RGB images so it is worth checking. Large photographic prints using colour laser printers produce great results although they expensive.
Quote:..is there a way to alter the conversion from RGB to CMYK so that, even if the colors change, at least the subtlety and variety of color is not so badly lost?..
If you look up RGB versus CMYK gamut you might get some information such as the first couple of pages here:
https://support.dma.ucla.edu/help/tutori..._guide.pdf
That shows the range of available colours for printed work is that much smaller, so some colours typically bright colours, are not available.
For CMYK it is best to start as you mean to finish. Apart from expensive editing applications, the free one to go for is Krita. https://krita.org
Your work in Gimp is not lost. Krita can open a RGB image and convert to CMYK (with the same restriction on gamut).