Bravia pics from Macbook too small!!

Hi - just got myself onto Serviio and looks to be a superb tool, but upon connecting it to my new LED 40 Bravia, I can find the pics ok but they only show as around 8-10" wide with a huge black surround to them.

I can't see an obvious way to make them full screen, is this anything to do with the Serviio sharing?

I am running OS X Leopard and have just 'Shared' my 'Pictures' folder in the Library...

Thanks

[Illico]

Could you provide information about that picture files ? (see signature link, ffmpeg -i <file>, or MediaInfo tools result in text format)