Export Paths from Photoshop

One very effective way to use Photoshop and Illustrator is to create a path in Photoshop (from a selection, for example), and use that path in Illustrator. To do this, go into Photoshop, open your document with your created path, and choose File>Export>Paths to Illustrator. In the resulting dialog, choose the appropriate path (which you saved when you created the path in Photoshop), in the Write pop-up menu, click OK, and open the resulting file in Illustrator. At first, you won't see anything except crop marks, which represent the boundaries of the Photoshop document. Switch to Outline mode from the View menu (Command-Y [PC: Control-Y]) to see, select, and start working with the path. (If you're unable to select or work with the path, you may need to use the Object>Expand command.)