A lot of people are not aware that every time you save a jpeg image it gets compressed a little more and so digital data is lost.
Over time this results in a degraded image. If you do it often enough you can see it in the highlight and shadow areas of the pic.
If you want to publish of make large prints its best to do all you editing to a copy of your RAW image. Then you will always have the original file to work with if it all goes pear shaped.
Sure RAW images are large but they do contain all the digital information recorded by the camera.
Also not all RAW image files are the same format. So some editing software may not handle RAW image files from some cameras.
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