[Digikam-users] tags, rating and comments in TIFF files

[Arnd Baecker]

Hi Piotr,

digikam uses exiv2 to access and write meta-data.
Support for tiff is being worked on (see http://www.exiv2.org/),
but I don't know the current status.
So to me it seems that for a proper solution to
the problem you discuss, it should be done on the level of exiv2.

Gilles, and Andreas will be able to give a more detailed account on this,
but I would suggest to get Andreas Huggel's from exiv2 opinion first,
before you start hacking ;-)
I am sure that contributions are very welcome!

Best, Arnd

On Mon, 22 Oct 2007, Piotr Tarnowski wrote:

> Hi all,
>
> I found no support for storing digiKam tags, rating and comments in TIFF
> files.
> Am I right?
>
> If it is so I'm going to implement this storage using tag 270 (comment).
> Content of this tag is presented by digiKam, so it is easy to use it for
> image to database replication. One can easily change content of this tag
> with command line tool:
>
> tiffset -s 270 "Comment" a.tif
>
> or:
>
> tiffset -sf 270 file-name-with-comment.txt a.tif
>
> I'm going to use following syntax:
> comment must start with "digiKam:\n"
> then goes rating like this: "rating:5\n"
> then every tag takes one line "tag:path/to/tag\n"
> finally goes digiKam comment "comment:first line\nnext line..."
>
> I do not know how to implement writing to TIFF - I will try to hack
> 'tiffset' sources to learn and if I will fail I will call this command
> from digiKam.
>
> Any comments and suggestions are welcome, from which the best would be -
> do not do this it is already in digiKam but you haven't found this :)
>
> /Piotr
>
> PS. Sample comment contents:
> DigiKam:
> Rating:3
> Tag:Who/John
> Tag:Who/Marry
> Tag:Where/Spain
> Tag:How/Tripod
> Comment:
> My favorite
> photo from vacations.
>
> ----------------------------------------------------
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> o godz. 19.00 w TVP 2. Zobacz koniecznie!
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>
>
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