Converting RGB to CMYK, display options

There is no inherent CMYK display profile delivered with macOS. Your display is going to show you an RGB or sRGB variation of your converted CMYK image. Your color printer on the otherhand, deals in CMYK and there the color model image change will appear, or it should.

Thank you kindly for joining the discussion, VikingOSX.

Grateful for the expert knowledge your have shared with us, so succinctly.

Apologies to all for the broken link in my reply above ...

ie: View and compare colour profiles

Re: Converting RGB to CMYK, display options: Is there a way to change display settings (if that is correct) to be able to view the difference.

Am no expert in the area, and am sorry I don't know of a way to compare RGB / CMYK.

As no-one has replied to your post so far:

If you haven't seen it yet:

Wondering whether Apple's "ColorSync Utility User Guide" may be helpful:

https://support.apple.com/guide/colorsync-utility/welcome/12.1.0/mac

Eg: One article: View and compare colour profiles in ColorSync Utility on Mac

https://support.apphttps://support.apple.com/guide/mac-help/prtct002/mac

Also: Apple support's article for Mac: Print settings on Mac:

https://support.apple.com/guide/mac-help/prtct002/mac