These are chat archives for openseadragon/openseadragon
So, it sounds like the closest I could come for now would be by doing it bifocal-style: essentially having two viewers and keeping them both in sync with each other by forwarding events. I could have a band across the bottom which would be the view at the higher resolution, and the rest of the screen would be at a lower resolution.
You could think of this (or implement it) as an inverse navigator.
It does seem like birds-eye view might be generally useful, for any image processing where one is hunting for specific features, since it would allow you to scan an image much more rapidly. The gradual drop-off in magnification creates an extremely intuitive experience.