1. My understanding is.... If I open a photo file for editing and Save then I have made changes to the original and also degraded the file a bit.. Makes sense to me. 2. If I edit and Save As to a new file then I have maintained the original file quailty and now have a new edited (but degraded) version of the original.. Now, if I open a file into processing software and play around with it BUT do not save any changes, have I degraded the original file? I tend to open various photos constantly to experiment with software but never save changes. Am I damaging my originals by constantly opening them for experimatation? Seems # 2 above would apply. Just want to make sure I'm thinking correctly.