- The full size image preview - that will save about 3MB
- The various Lightroom/Photoshop adjustments embedded in the XMP portion of the DNG - ISO dependent noise reduction settings, lens profiles, etc
DNG cleaner will also optionally remove opcodes, and apply lossless compression. This isn't relevant to the M10, but in many other Leica cameras, e.g., the Q, the SL, etc, opcodes are used for lens correction. For an example of the SL's with and without lens correction, see my post on the subject. DNG Cleaner is what Sean Reid used to remove opcodes for his SL 50 review, which some of you will have seen.
As ever, back up your files before using any app that is designed to modify them.
For more information on DNG Cleaner, see the website.
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