Zoom it provides a simple service based way of loading images and serving out tiles. The Zoomit service is based on the DZI format.
OpenSeadragon can render the DZI tiles and provide you all the features you can only get with OpenSeadragon.
If you are pulling image tiles from zoom it, please understand and respect any policy and copy rights of the image creator.
Configuration is done via the 'tileSources' option ( or programatically ).
OpenSeadragon({ ... tileSources: [{ Image: { xmlns: "http://schemas.microsoft.com/deepzoom/2009", Url: "http://cache.zoom.it/content/WwI0_files/", TileSize: "254", Overlap: "1", Format: "jpg", ServerFormat: "Default", Size: { Width: "5816", Height: "3961" } } }] ... });