Adding a border
The Hawaii postcard is nearly done. The elements are almost all arranged correctly in the composition. You’ll finish up by positioning the postmark and then adding a white postcard border.
Select the Postage layer, and then use the Move tool () to drag it to the middle right of the image, as in the illustration.
Select the Island Paradise layer in the Layers panel, and then click the Create A New Layer button () at the bottom of the panel.
Choose Select > All.
Choose Select > Modify > Border. In the Border Selection dialog box, type 10 pixels for the Width, and click OK.
A 10-pixel border is selected around the entire image. Now, you’ll fill it with white.
Select white for the Foreground Color, and then choose Edit > Fill.
In the Fill dialog box, choose Foreground Color from the Contents menu, and click OK.
Choose Select > Deselect.
Double-click the Layer 1 name in the Layers panel, and rename the layer Border.