This is called non-destructive editing. Picasa does the same thing until you "Save". If you Save As tiff files, intermediate files will not lose quality, then Save As jpeg for your final print.cod wrote: My understanding is that Lightroom deals with jpg edits the same way it deals with RAW edits. It does not alter the original file. Edits are recorded as a set of instructions separate from the original file. These changes are applied to the preview image on the screen so you can see your changes, and a new image file with all the edits applied is created when you export your result, but the original image file is unchanged.
MLKstudios wrote: Not if you shoot in RAW. The way Lr works on a RAW file is it "appends" the edits to the original file. That way you can always go back steps or all the way back to the original.
Best to shoot RAW, edit and at the very end make a JPEG if needed.
HTH
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