[Digikam-devel] [Bug 220545] Cannot write XMP sidecar files

[Andreas Huggel]

https://bugs.kde.org/show_bug.cgi?id=220545





--- Comment #9 from Andreas Huggel <ahuggel gmx net>  2010-04-01 03:33:09 ---
Exiv2 (that without the little 'k' ;) converts a number of Exif tags and IPTC
datasets to the XMP sidecar and back. Try it out with the exiv2 command line
utility. 

Gilles is right about the makernote, that is lost. It's also true that I'm not
keen to dump the makernote as a large binary blob into an XMP property as
exiftool does. It is unlikely that any other application would ever be able to
deal with such a blob properly. Instead I suggested to write the _known_
makernote tags as readable properties in new custom namespaces (e.g., like
Xmp.Nikon3.WhiteBalance). But that's just an idea at this point, no such code
exists yet.

> maybe I could first get reading and writing XMP sidecar files supported from a
> menu command, and then we can see where we want to go from there?

I think that should be possible. In digiKam the main concern is about the
workflow and the options to control the handling of XMP sidecars. When it comes
to the contents of the sidecar files, you'll need to turn to libexiv2. 

Andreas

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