Raphael, The School of Athens, 1510-1511, Fresco, Stanza della Segnatura. h1atican Museum, Rome.

This example of drop shadowed text has been accomplished by creating a clipping group. Basically you create a new file, create bold black text and open an image file which you drag and and drop into the new file. With the image file active, press control G (PC) I also added an inner glow to the text layer as well as the drop shadow.