[Digikam-devel] saving tags and rating into IPTC tags...

[Gilles Caulier-2]

Hi all,

digiKam 0.9.0-svn use now Exiv2 instead libkexif at all (note : today i have
removed definitivly libkexif depency from digiKam core)

New horizon can be done using Exiv2, especially to save new metadata in image.

Many users have reported some request to save in image the Tags and Rating
informations into photograph like it does into databasein both of database.
This is can be done using IPTC metadata...

About digiKam Tags, i propose to use "Iptc.Application2.Keywords". From
www.iptc.org, the IPTC documentation (page 32) said :

2:25 Keywords :
              Repeatable, maximum 64 octets, consisting of graphic char-
              acters plus spaces.
              Used to indicate specific information retrieval words.
              Each keyword uses a single Keywords DataSet. Multiple key-
              words use multiple Keywords DataSets.
              It is expected that a provider of various types of data that are            
              re-lated in subject matter uses the same keyword, enabling the
              re-ceiving system or subsystems to search across all types of
              data for related material.

              Examples:
                       "GRAND PRIX"
                       "AUTO"


About digiKam Ratings, i propose to use "Iptc.Application2.FixtureId". From
www.iptc.org, the IPTC documentation (page 32) said :

2:22 Fixture
                Not repeatable, maximum 32 octets, consisting of graphic char-
                acters. Identifier Identifies objectdata that recurs often and
                predictably. Enables users to immediately find or recall such
                an object.
                Example:
                         "EUROW EATHER"

More informations about IPTC :

http://www.exiv2.org/iptc.html
http://www.iptc.org/IIM/4.1/specification/IIMV4.1.pdf

Let's me hear your viewpoints, and your feedback if you have already used an
another photo-management program running like this.

Regards

Gilles Caulier
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[Gilles Caulier-2]

Thanks to all for your remarks. Look below for last changes in svn...


Le Jeudi 30 Mars 2006 01:39 PM, Gilles Caulier a écrit :

> Hi all,
>
> digiKam 0.9.0-svn use now Exiv2 instead libkexif at all (note : today i
> have removed definitivly libkexif depency from digiKam core)
>
> New horizon can be done using Exiv2, especially to save new metadata in
> image.
>
> Many users have reported some request to save in image the Tags and Rating
> informations into photograph like it does into databasein both of database.
> This is can be done using IPTC metadata...
>
> About digiKam Tags, i propose to use "Iptc.Application2.Keywords". From
> www.iptc.org, the IPTC documentation (page 32) said :
>
> 2:25 Keywords :
>               Repeatable, maximum 64 octets, consisting of graphic char-
>               acters plus spaces.
>               Used to indicate specific information retrieval words.
>               Each keyword uses a single Keywords DataSet. Multiple key-
>               words use multiple Keywords DataSets.
>               It is expected that a provider of various types of data that
> are re-lated in subject matter uses the same keyword, enabling the
> re-ceiving system or subsystems to search across all types of data for
> related material.
>
>               Examples:
>                        "GRAND PRIX"
>                        "AUTO"
>

Done in svn. All Tags titles are stored in "Keywords" IPTC tag like a simple
strings list.

>
> About digiKam Ratings, i propose to use "Iptc.Application2.FixtureId". From
> www.iptc.org, the IPTC documentation (page 32) said :
>
> 2:22 Fixture
>                 Not repeatable, maximum 32 octets, consisting of graphic
> char- acters. Identifier Identifies objectdata that recurs often and
> predictably. Enables users to immediately find or recall such an object.
>                 Example:
>                          "EUROW EATHER"

Done in svn. Rating is stored in this tags like this : "digiKamRating=x" with
0 < x < 5. Let's me hear if this text is right for you...

Others changes are :

Comments is stored in IPTC "Caption" tag and "UserComments" Exif now.
Date & Time stamp are uptdated in Exif and Iptc tags.

Take a look in Metadata Setup dialog page for more informations.

Gilles


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