I agree, simply being able to select the images to zoom them separately would be terrific.
In another set of posts I had described how two ePub-formatted magazines--when viewed on the color Nook--would launch a graphical version showing a set of higher-res images as the pages, and these images were zoomable. However, in a normal ePub book or document, the usual white-pages-and-text version, all the images were -not- zoomable. It came down to one specific XML file included in the ePub file that controlled the graphical version.
The point being that if something like this could be done, or just fire up the images in a separate process, it might let the images be zoomable apart from whatever the ePub restrictions are. How about simply pressing on the image and getting a menu option to "View image in default viewer", or something like that. Then the author could put a small version inline and the reader could select to view a larger -zoomable- version it if he or she wanted to.
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