Question to exporting metadata into sidecar files

[herb]

Hallo Phil,

I am working with the Exiftool Windows executable version 9.25 on a XP system.

My JPG-file t1.jpg contains exif, iptc and also xmp metadata.
With the following commands I tried to export metadata into a MIE file and also into a XMP sidecar file.


The command

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exiftool -tagsfromfile t1.jpg -IFD0 -EXIFIFD t1.mie
responds: No writable tags set from t1.jpg

But the command

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exiftool -tagsfromfile t1.jpg -EXIF t1.mie
creates the MIE file and the file contains tags in IFD0 and EXIFIFD group.

Why does command 1 not work?

Using the above commands, but specifying an XMP output file t1.xmp do also not work.
Both respond: Nothing to write


For an JPG file without XMP metadata the command

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exiftool -tagsfromfile t2.jpg -All t2.xmp
creates the XMP file.


What I am doing wrong?
What do I misunderstand, because I thought all commands should work.

Thanks for your help in advance.
Best regards
Herb

[Phil Harvey]

Hi Herb,

IFD0 and EXIFIFD are not valid ExifTool tag names.  EXIF is an Extra tag that is used to access the EXIF data block.

To extract and preserve the EXIF and XMP from a JPEG image into a MIE file, you should use this command:

exiftool -tagsfromfile t1.jpg -xmp -exif t1.mie

- Phil

[herb]

Hello Phil,

thanks for your quick reply and your hint to "Extra tags", which really helped me to understand my problem more and more.

Because the following commands

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exiftool -tagsfromfile  src.jpg  -IFD0:all -EXIFIFD:all src.mie
exiftool -tagsfromfile  src.jpg  -all:all               dst.jpg
exiftool -tagsfromfile  src.jpg  -all                   dst.jpg
work properly I thought that also

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exiftool -tagsfromfile  src.jpg  -IFD0 -EXIFIFD         src.mie
will work.

I interpreted the following sentence in exiftool help

exiftool -tagsfromfile src.jpg -all:all dst.jpg
         Copy the values of all writable tags from "src.jpg" to "dst.jpg",
         preserving the original tag groups

that the command

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exiftool -tagsfromfile src.jpg -all dst.jpg
will copy the values of all writable tags from "src.jpg" to "dst.jpg",
but tags are written into the predefined taggroup (which is true) is working for all groupnames - and not only for -all.


When I use -tagsfromfile in order to copy tags from a source file into a destination file, I can specify the following
   -all
   -all:all
   -group:all with group a family 1 groupname
   -some specific extra tags like: -exif, -makernotes, -xmp and -iptc (without :all)
       whereas -iptc cannot be used in case creating an xmp sidecarfile.

Is this summary correct?

Thanks for your help and best regards
Herb

[Phil Harvey]

When I use -tagsfromfile in order to copy tags from a source file into a destination file, I can specify the following
   -all
   -all:all
   -group:all with group a family 1 groupname
   -some specific extra tags like: -exif, -makernotes, -xmp and -iptc (without :all)
       whereas -iptc cannot be used in case creating an xmp sidecarfile.

Is this summary correct?

You're still missing a some variations.  You can specify any writable tag name (not just the Extra tags, but other writable tags too), with or without a group name.  And you can specify as many of these as you want together in the same command.  (Plus, there is the redirection feature.)

- Phil

[herb]

Hello Phil,

thanks for your comments.
Yes you are right, but I was so concentarted in 'groupwise' copy of tags that I forgot to mention single writable tags.

Thanks again and best regards
Herb