Jman13 Online Upload & Sell: On
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I believe the JPG noise reduction also looks at JPEG compression artifacts in how it determines where noise is, and perhaps the larger mottling that high noise JPEGs tend to have vs. RAW, which is generally finer and less blotchy.
Essentially, use the JPEG settings if you're working on an out of camera JPEG, and use the RAW settings if you converted it from RAW.
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