Photoshop Page Setup in the Mac OS

To choose which printer is active in the Mac OS, use the Print Center to access the Page Setup dialog box choose File➪Page Setup, or press Shift+Ô+P. You can set the page size and orientation, scaling, and additional parameters, depending on your printer.

In Mac OS X, you can also choose a printer directly from the Print dialog box just as you can in Windows. Also in Mac OS X, if you’re connected directly to a printer via the USB port, the system automatically detects the printer. If you’re on a network, you can use Print Center and select a printer from the Printer list or in the Print dialog box.