Thankyou to the advice I received re processing. I also went to chapter 4 of Photoshop Astronomy which has a tutorial on Curves and the image they use is the Rosette Nebula. The great thing for me is the difference processing can make. Included is my final image from yesterday which was posted " Rosette Nebula Happy but totally lost in processing" to only processing in Photoshop CS3. A lot to learn as I copied the suggested data points on my own image but making progress.