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See the XMP-crs tag name documentation for a list of tags which are/aren't writable. Basically it i
+s the gradient- and paint-based correction tags that exiftool can not write.
I might have misunderstood but I just tried it one way and the gradient information was retained. This was just grabbing the xmp sidecar as whole and writing it into the image.
exiftool "-xmp<=%%d/%%f.xmp" -ext nef .
Of course that was from the LR generated xmp file. So I guess the problem is when Exiftools extracts xmp:crs then those fields will not be written out.
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