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Before you can print a photo from Lightroom, you must first enter the proper settings in the Page Setup dialog box. This dialog box is native to your operating system (Mac OS X or Windows XP/Vista/7) and enables you to specify which printer to send the file to. You must also select a corresponding paper size and orientation (portrait or landscape). Note that paper size options may vary depending on which printer you’ve chosen.
Configure the Page Setup dialog box in Mac OS X
Timesaver
Press Cmd+Shift+P to open the Page Setup dialog box.