Hello everyone,
does someone know what metadata i need to use in an image file so that nepomuk can index my tags automatically?
I'm currently using "exiftool -keywords=mytag" and that creates seperate Iptc.Application2.Keywords entries in my image files, but nepomuk does not index those tags. It seems that other keywords specifications don't work too, for example image files tagged with windows Exif.Image.XPKeywords or TagsList from digiKam.
I can only make it sort of work when i use neposync to export the tags from the files to nepomuk but that has many limitations like not being able to specify the exact metadata to use and only being able to process jpg. The folders themselves are marked in the nepomuk configuration.

Well, apart from that i am mostly satisfied with nepomuk, it is extremely fast since 4.10 and doesn't crash my desktop into nirvana any more. Good job

Nepomuk is indexing only a few tags from exif specification so is normal that you can't locate in your photos this information.

Here is the source code of the extractor http://api.kde.org/4.10-api/kdelibs-apidocs/nepomuk-core/html/exiv2extractor_8cpp_source.html where you can check what fields are supported. This is the list:

Exif.Photo.Flash
Exif.Image.Make
Exif.Image.Model
Exif.Image.DateTime
Exif.Image.Orientation
Exif.Photo.FocalLength
Exif.Photo.FocalLengthIn35mmFilm
Exif.Photo.ExposureTime
Exif.Photo.FNumber
Exif.Photo.ApertureValue
Exif.Photo.ExposureBiasValue
Exif.Photo.WhiteBalance
Exif.Photo.MeteringMode
Exif.Photo.ISOSpeedRatings
Exif.Photo.Saturation
Exif.Photo.Sharpness

But some of this fields are not working because I just fixed a few today so you must wait until next KDE release or compile nepomuk-core.

Analyzers are in early stages so if you want you can fill a wish for improving this one in bugs.kde.org.