Let's say I print green (0,255,0) from Adobe RGB with a printer profile. Then I convert it to ProPhoto RGB (same green is now 76,230,60 in ProPhoto) and print it with the same printer profile. Do inkjet printers use the same ink combination for printing same green but sent from different workspaces?
Ok, it's obvious, forget about it.
Another question: Can we know that RGB printer profiles use which RGB color space for converting from the workspace?