It's possible. If you mean anaglyph photo, then is special software (StereoPhoto Maker for example). I think, that stereo photo possible to make with standart Photoshop features, but only for grayscale mode photo. You must to add two additional channel to current RGB: red and green or red and blue. Then shift two channels relative to main RGB channels. Maybe, you'll have anaglyph photo at the end. Or maybe I wrong.