Copying makernotes - again #2

[herb]

Hello Phil,

In a thread - "Copying makernotes - again"
https://exiftool.org/forum/index.php/topic,4562.msg21725.html#msg21725
started in November 2012 we discussed how to copy makernotes.
I learned that makernotes itself and also the tags make and model belong together and I am sure that at that time makernotes could only be copied together with -make and -model.

By accident some days ago I have seen that with version 9.41 (on a Windows XP system) makernotes can be copied without make and model.
The solution in version 9.41 is the one I ever wanted to have.
Because I did not recognize that change in your histories I would like to ask whether it is the correct behaviour or is it an error?

Thanks for your help again.
Best regards
Herb

[Phil Harvey]

Hi Herb,

You still need to copy the Make and Model.  While it is true that ExifTool will recognize some maker notes without these, it won't work for all makes and models.

- Phil

[herb]

Hello Phil,

thanks for your quick reply.

Is there a golden rule in order to decide which makernotes might be copied without Make and Model?
I am astonished because today I can copy the Olympus makernotes without Make and Model and one year ago it was not possible for identical images.

Thanks and best regards
Herb

[Phil Harvey]

Hi Herb,

Interesting, because I don't think that I changed anything in the Olympus MakerNotes recognition within the last couple of years.

You can look at the MakerNote.pm module to see how the recognition is done.  Any tag with $$self{Make} or $$self{Model} in the Condition statement requires this information.

- Phil

[herb]

Hello Phil,

thanks for telling me all the details.

One year ago I was working with images of various manufactures - Canon, Olympus, Panasonic and other.
Now I understand the problems I had copying MakerNotes e.g. from a *.jpg file into a *.mie or *.exif file or copying the Makernotes back into the image file.
One year ago it seemed to be a miracle - now it is clear.

Thanks and best regards
Herb