The Emboss command is used to make a selection look embossed or stamped. It does so by converting the color of a selection to gray while edges of this selection remain the original color. Parameters include embossing angle (varies from -180- for a concave up image to +180- for a concave down image), height, and percentage of the amount of color within the selection (from 1% to 400%).
The Emboss dialog starts by clicking on "Effects -> Emboss" on the user menu.