How to remove duplicate files from the Photos app library I am running OSX 10.12.6 and sorting a large number of mostly not native digital pictures (scans from negatives).
Using the command:

fdupes -r -A  "/Users/yves/Pictures/Photothèque.photoslibrary/Masters" 


I get many results of duplicates like below, same files but in different subfolders:

/Users/yves/Pictures/Photothèque.photoslibrary/Masters/2019/12/27/20191227-174527/_NIK3130.tif
/Users/yves/Pictures/Photothèque.photoslibrary/Masters/2019/12/31/20191231-081818/_NIK3130.tif
/Users/yves/Pictures/Photothèque.photoslibrary/Masters/2020/01/02/20200102-183407/_NIK3130.tif



Is this normal behavior ? I understand the same files may have been imported several times, but I wonder:
is is safe to eliminate the duplicates and how best to do it ? For convenience I am using exiftool in combination with Applescript to adjust (reconstruct mostly)  picture metadata in the Photos library from selected pictures and want to make sure I do this only once and for the correct file.
If they don't come up in Photos.app, I wouldn't touch what goes inside .photolibrary package. There are just too many questions of Photo library going wild. You anyway won't be saving much space there, if the files are tiny.


What software can find close duplicates from 2TB worth of pictures?