There are three core components of the Library’s support for IIIF:
First, the Digital Repository Service (DRS) Image Delivery Service now implements the IIIF Image API. This allows any IIIF viewer to display an image or image region for any open access image stored in the DRS.
Second, a new Harvard Library IIIF Presentation API service provides IIIF access to over 100,000 page turned objects that are currently stored in the DRS, including digitized books, manuscripts, diaries, and other digitized archival and library material.
And third, the Library has enabled the page viewer for DRS page turned objects to use a customized version of the Mirador viewer. See this link, for example, to see the new page viewer display a medieval Book of Hours from Houghton Library. The Mirador image viewer makes use of deep zoom technology via OpenSeadragon, an open-source web-based viewer for high resolution zoomable images.