Thread:Help talk:Datatables format/How to get thumbnails into result datatable?

I am runing a german Wiki and so far I wasn't able to get thumbnails into the result datatable.

My query looks like this:

All result data from the semantic attributes "Signatur", "Archivierungsart", "Laufzeit", "Quelle" and "Aufbewahrung der Originale" are listed correctly in the datatable. However, the attribute "Bild" contains the file name of a related picture (e.g. "hvg28.jpg") and I would like to have a thumbnail of that picture in the corresponding column of the result datatable. This is what does not work. What am I doing wrong? What are the requirements to get thumbnails into the result datatable?

Many thanks for any help!