This tutorial will show you how to install an ICC color profile on Mac OS X 10.5 (Leopard).
Place the color profile
You need to place the ICC color profile in the Library/ColorSync/Profiiles in your home directory. If you want the profile to be available for all users of the computer then you need to select the Library directory directly on your hard disk.
Open the ColorSync Utility
Open the ColorSync Utility (Applications > Utilities) and select the devices tab (1). Select the printer to which you want to associate a color profile to (2) and click on the drop down menu next to “Current Profile” (3).
Confirm the setting
The name of the color profile should now appear in the “Current Profile” section.