Trish, good question. Many customers want to get dynamic thumb-nails into reports and we don't yet support that natively. I also don't know of a "scrape" method to get all rendered marks. Good spotting on getPair - that is powerful albeit not what you want here.
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Although not supported natively in Tableau as mentioned by Anthony, Harley Ellenberger managed to do something similar in his thread dynamic image based on filter selection yesterday, which might be helpful.
Thanks Johan, what Harley managed to do is great but unfortunately won't work for me because I need to load multiple images at once. The number of images to be loaded will also be dynamic depending on the category chosen. It's a great trick I might be able to make use of for something else though.
Were you able to work on this scenario further. ? I am also facing the same situation right now and unable to figure out a solution.
It would be great if you have any insight on dealing with this.