Image-ExifTool - 'No writable tags found' error when overwriting tags

Posted on Sat Sep 6 23:33:44 2008 by hughstimson
'No writable tags found' error when overwriting tags
I have a set of images which have seperate EXIF and XMP CreateDate values, such that
exiftool -s -a img.dng -EXIF:createdate
yields
CreateDate : 2008:08:10 09:05:07
and
exiftool -s -a img.dng -XMP:createdate
yields
CreateDate : 1901:01:02 04:05:07Z
for example. But when I try to overwrite one with the other,
exiftool -tagsfromfile img.dng -'EXIF:createdate>XMP:createdate' img.dng
I get the error
No writable tags found - img.dng
Am I doing something wrong?
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