I am running Photoshop CS4, and I am trying to merge a picture using the built in Photomerge option. However, when I run the Photomerge, some of the pictures merge, and it tends to seperate into different sections. My picture also is cut up, and the roof of the building I am doing is not straight. In the photomerge options, I am using the Reposition option. Does anyone know how I can fix this, and get the photomerge to be successful?