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...Basically, the IIIF Image API delivers the pixels of an image in a simple and intuitive way that easily specifies the region, size, rotation, quality characteristics and format of the requested image.
- The URI syntax is: {scheme}://{server}{/prefix}/{identifier}/{region}/{size}/{rotation}/{quality}.{format}
- and the Information URI Syntax (in JSON) is {scheme}://{server}{/prefix}/{identifier}/info.json
In addition to the Image API, IIIF has also developed the Presentation API which provides just enough data about digital assets and their structure to drive a viewer experience. In IIIF jargon, we talk about canvases for images and manifests for digital objects (which are in a way the glue that structures all canvases together). The latter is also serialised in JSON.
- IIIF recommends this URI pattern: {scheme}://{host}/{prefix}/{identifier}/manifest
ARK and IIIF URIs can easily be used together because IIIF is simply an extension giving more precise information about the region of interest of a given image (or soon of an audiovisual resource with API versions 3.0).Gallica had also achieved in part what IIIF wanted to establish by using ARK qualifiers. For instance, this folio 42:
- https://gallica.bnf.fr/ark:/12148/bpt6k3368104f/f42.image
- is the same as https://gallica.bnf.fr/iiif/ark:/12148/bpt6k3368104f/f42/full/full/0/native.jpg
- but maybe I'm only interested by this region of interest: https://gallica.bnf.fr/iiif/ark:/12148/bpt6k3368104f/f42/100,550,1000,1000/full/0/native.jpg
Other examples from the BnF:
Image Request: https://gallica.bnf.fr/iiif/ark:/12148/btv1b90017179/f15/0,1900,2400,1200/full/0/native.jpg
Image Information: https://gallica.bnf.fr/iiif/ark:/12148/btv1b90017179/f15/info.json
IIIF Manifest: https://gallica.bnf.fr/iiif/ark:/12148/btv1b90017179/manifest.json
The Durham University Library has also deployed IIIF with ARK identifiers - https://www.durhampriory.ac.uk/about-the-project/technology/ark-urls/ - and I have just noticed that the first example in the ARK identifiers FAQ is also IIIF-compliant: https://digital.library.unt.edu/ark:/67531/metadc107835/ (https://digital.library.unt.edu/ark:/67531/metadc107835/manifest/).
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