[NTG-context] Crediting copyright on photographs

I need to include the copyright acknowledgement / photographer credit on an image but I'm not sure what's the best way to do it. Option 1: I can add the acknowledgement to the end of the \placefigure caption text: e.g. \placefigure{A picture of a cow. Image of a cow that may or may not be under copyright anymore.}{\externalfigure[cow][height=6cm]} then the copyright bit will appear in the Table of Figures which I don't really want to happen. Is there a way to truncate this? Option 2: some magazines print the copyright credit running up the side of the image, independently of the caption. I'd quite like to do this and wondered if anyone had already written something they could share? — Bruce Horrocks Hampshire, UK