I've shot a series of church windows and, while being as diligent as is possible for me, the perspective varies from shot to shot. Using PS CC 2014, I've tried opening two images as layers and, using the transform tool, match the perspective of one to the other while playing with layer transparency. I'm still having a difficult time seeing what I'm doing. Can you suggest a particular blend mode or other specific techniques that might help me accomplish my goal. Thanks in advance.