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If your original is a jpeg and you open with PS and you do a 'save as' (so the edited version is saved as a seperate file) and close the original (with no saving), does that degrade the original file?
Hijack - Just having completed an intro to photography class, my inst said why would someone who is not selling their pics to a magazine want to shoot in RAW? There is no image processing (white balance, compression, exposure, etc etc) taking place in your camera while shooting in RAW so you have to completely edit your image in order for it to be a viewable image. And RAW between Nikon is not the same as RAW in Canon which is not the same as RAW in Olympus.
He said if you get the lighting close and exposure close while shooting in JPEG then you might have to a little editing on your image instead of having to do MAJOR editing if you shoot in RAW.
Personally I don't want to have to spend extended hours of editing to enjoy my vacation photos.
He said to shoot in JPEG, download pics to your computer, save pic you want to edit as a TIFF, Edit, then resave as a JPEG keeping your original image untouched. Backup your original and your edited copy at least one, twice if they are important. (you can delete your TIFF after you complete your editing. If you save a JPEG and then edit the JPEG, every time you resave the JPEG you loose quality on your image)
Just my .02. I am not a photo expert but I did sleep at a Holiday Inn Last night....
Hijack over.
In the process anyway, thanks...The most important thing Don is did you learn anything useful?