I'm currently trying to use the Open Library Covers API together with the New York Times Bestsellers API to create a feed of bestsellers with cover images.
The NYT feed has all the book information, including ISBNs, but no covers. However, you can call cover images from OpenLibrary by plugging an ISBN into a URL.
So, I tried using feeds tamper rewrite plugin for an xpath expression (using xpath parser) that was mapped to an image field like this:
where [xpathparser:6] is the replacemenat pattern for the field that maps the ISBN.
Not working. Is there any possible way to do this? I think the tricky part is that the image is NOT actually included in the feed...