Possibly slightly easier: Yes, make sure Snap and Rulers are active - View>Snap, View>Rulers Click on your bottom layer in your layer stack, click on the left ruler on your image and drag out to the middle and the guide will snap into place at exactly the center. If you try it on any upper layer, you go through the Ctrl+A function, do it on the bottom and it's automatic. Hope that helps- -Lew ;-)