A novel idea of color management per ink cartridge was previously proposed by us. This paper will describe the implementation details. Ink cartridges of color inkjet printers have been found accountable for the color variations from cartridge to cartridge under otherwise fixed printing conditions. It is not feasible to perform a color characterization and further build a printer profile at the user level for each ink cartridge by general users, due to the requirement of a color measuring instrument and extensive color science knowledge. However, characterizing cartridges at the manufacturing stage with simple procedure is quite achievable. It includes printing a set of simple CMY step wedges, measuring color with a digital camera, and storing away the characterization data associated with the cartridge identification number. The characterization data can be stored in a server and ready for access at the user level through the Internet. Upon installing a new ink cartridge at the user level, a dedicated application software, with minimal user intervention, will retrieve the characterization data, re-build the output LUT, and then update the printer profile, all transparent to the user. This paper will explain how the characterization is done, and how the ICC profile is updated reflecting the characterization of the cartridge.