Professional photo printers are photo printers with 6 or more cartridges. This means these printers have more ink colors, so you can print photos with a more realistic color representation. As a professional photographer, you can show your printed photos as they're intended. Some models print documents on A3 size paper. This is useful if you print brochures or posters, for example. With a professional photo printer, you can print wirelessly via Apple AirPrint or Google Cloud Print.