Each time a JPG file is SAVED, it CAN degrade, but if no major changes are made to it, then opening and saving it repeatedly at the same compression level makes little or no difference. The file does not degrade on being OPENED.
The only time a jpeg image degrades is if you make any alterations to it and resave it. The way I go is. Make a copy and save it as a .tif file. Then make any enhancements you need to and save. You would need photo editing software though, like Paint Shop Pro or PhotoShop
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