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ExifTool => Newbies => Topic started by: photogger on June 17, 2012, 08:10:57 PM

Title: "tagsfromfile" rounds off & partially copies tags - who's at fault?
Post by: photogger on June 17, 2012, 08:10:57 PM
Hi,

I ran into problem where only partial metadata is being copied from SOURCE to TARGET when using the "--tagsfromfile SOURCE.NEF TARGET.TIFF" command. It also seems to round off numbers (i.e., 160.061349693252 becomes 160)

For instance:

Code Select

>exiftool -v -tagsfromfile SOURCE.NEF TARGET.TIFF
Setting new values from SOURCE.NEF
======== TARGET.TIFF
Rewriting TARGET.TIFF...
  Editing tags in: Composite Ducky ExifIFD File FotoStation GPS IFD0 IFD2 IPTC J
FIF KDC_IFD KodakIFD MIE-Camera MIE-Doc MIE-Flash MIE-GPS MIE-Geo MIE-Image MIE-
Lens MIE-Main MIE-Preview MakerNotes MetaIFD PDF PNG Photoshop PostScript SubIFD
SubIFD1 SubIFD2 TIFF XMP
  FileType = TIFF
  MIMEType = image/tiff
  ExifByteOrder = II
  Rewriting IFD0
  Creating XMP
  Creating IPTC
  Creating ExifIFD
  Creating GPS
  Copying 1 image data blocks
    1 image files updated

Comparing the two files...

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>exiftool -all:GpsAltitude FILE.NEF
GPS Altitude                    : 160.061349693252 m
GPS Altitude                    : 160.0613497 m
GPS Altitude                    : 160 m Above Sea Level

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>exiftool -all:GpsAltitude FILE.TFF
GPS Altitude                    : 160 m
GPS Altitude                    : 160 m Above Sea Level

This makes Lightroom, for instance, display different altitude (525.1ft for SOURCE and 524.9 for TARGET). Not a big difference but things don't look so good for the "Lens" tag that breaks Lightroom's lens correction since 17.0-50.00 mm f/2.8 from SOURCE becomes 17-50mm f/2.8 in TARGET.

Am I doing something wrong?
Title: Re: "tagsfromfile" rounds off & partially copies tags - who's at fault?
Post by: Phil Harvey on June 17, 2012, 08:53:34 PM
Tags are copied by the value you see when extracting.  Typically, if you want to avoid rounding, add -n or use -TAG# when copying.

About the Lens tag, I can't say exactly why the zeros are getting dropped.  The XMP:Lens is a simple string that ExifTool does not tamper with.

- Phil
Title: Re: "tagsfromfile" rounds off & partially copies tags - who's at fault?
Post by: photogger on June 17, 2012, 10:45:03 PM
The -n worked.

Still don't know what to do with the Lens field(s). I sent you a private message with a link to the RAW file and would appreciate if you could check it out.

Thank you.
Title: Re: "tagsfromfile" rounds off & partially copies tags - who's at fault?
Post by: Phil Harvey on June 18, 2012, 07:49:33 AM
I got the NEF file, thanks.  This file contains no XMP, and the lens information is stored entirely in the Nikon maker notes.

The Nikon:Lens tag is extracted as "17-50mm f/2.8", and copied to XMP:Lens by your command.  I can't comment on LightRoom, but this may be a more appropriate way to copy lens information in your case:

exiftool -v -tagsfromfile SOURCE.NEF -all "-lens<lensid" TARGET.TIFF

Which will copy "Sigma 17-50mm F2.8 EX DC OS HSM" into XMP:Lens.

- Phil
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