What I would do would be add your images into your tableau repository's custom shapes file. Then instead of having your pictures of ice cream, meat etc. as background images on the dashboard I would put them in as shapes on individual sheets. Then add these sheets to your dashboards and and then have individual action filters for the individual sheets which are associated with one item.
Does this make sense? When you have access to your computer feel free to upload the package workbook and I can help some more.
Thanks for your replies.
The ice cream and meat was just an example as the real project I am working on is a highly restricted data flow diagram.
So the image I am essentially working on is a flow diagram for different "Objects", I was just trying to explain my scenario easier.
Although I would love to split out the diagram into different sheets for different objects its unfortunately not possible. It's one big image that I have plotted different points onto that you can hover over and click
Any other ideas?