If I understand you correctly, you want to leave a shadowed text on a picture. You could do this with a font if you can find one that does this, or 1. type whatever you want on your picture. 2. Duplicate the text layer. Move it to where you like it. (I colored mine blue to differentiate from the first layer.) 3. Ctrl-click on the top text layer to select it's outline, then click on the bottom text layer in the layer channel. Hit delete. This should get rid of the text areas you don't want. Delete the duplicated text layer. It should appear something like the 3rd picture. Good luck!