I am an amateur genealogist, researching and archiving my own
family's history. I have been scanning negatives, slides, and prints
taken by various family members. Now I would like to apply metadata
information to these image files. I want someone viewing these files
to know not only who and what is in the image, but also who took the
photograph (my late father, for instance) and who scanned it
and `owns' it now (me).

I seem to have trouble reconciling which metadata fields pertain to
the physical image artifact (negative, slide, print) and which apply
to the scan & file I have created. In my situation, who is
the `creator'? Who is the `author'? Who is the `source'? My guess
is that I am the creator of the scanned image, but that my father is
the source. Is this correct?

I am not sure if the person who scans an existing image gets any
particular credit in the metadata fields, unless they are also the
photographer or owner. Do they? Suppose that I scan some artwork
done by my aunt: who is the creator in this case? And in a more
complicated case, where I scan a print belonging to a cousin, but
originally owned by my grandfather, is there a correct way to
describe that situation in the authorship/source metadata fields?

Any thoughts on the matter are appreciated!