I did a variation on the rule which avoids messing with any photos that I've edited - it will keep the RAW photos if they've been edited. All non-edited RAWs are deleted. This made sense for me, since if I've manually edited a photo, I probably want the highest quality RAW source to remain.
How to clean up the ginormous RAW files from Photos.app by exporting, deleting, then re-importing.
Notes:
1. This example made use of the fact that only one of my cameras was shooting RAW. You may need a different rule-set!
2. I've never shot in RAW only mode - if you have, these rules won't work for you.
Do a Time Machine backup first.
Make a New Smart Album in Photos.app
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This will get all of the photos taken with my new camera (Sony A6000) which include JPEGs as well as RAW+JPEGs but will skip any you that I edited inside Photos.app, and will skip all of my iPhone photos which are never RAW.
Export Unmodified to a new folder:
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Options:
Default options are good, putting all photos in single folder.
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Export, then Sort by Kind in the Finder
You will see JPG as well as RAW files (for my Sony A6000, these are .ARWs - not necessarily for all photos, but only for the ones shot in RAW+JPEG )
Wait until it's done (there is no progress bar…)
In the Finder, Manually Separate the RAW and JPEG files to new folders.
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In Photos.app, delete the selected photos.
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Then go to the Recently Deleted album and Delete All
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Note: I didn't see my drive space free up instantly - you may want to quit Photos.app at this point to let it clean up?
Go back to Albums / All Photos:
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File / Import…
Select the JPEGs only.
Import all new files