Thread: Noisy pictures
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Old Dec 10, 2013, 9:42 AM   #6
peripatetic
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One possibility is if you are using jpgs and are repeatedly opening them to view and then SAVING them. Each time you actually save a jpg it re-compresses the file and that (being a lossy process) will degrade the images just a bit every time you re-save it from an editor.

Some programs won't re-compress if you don't edit, but some might if you say yes when they ask you if you want to save.
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