Overview

I had the opportunity to try the IIIF Content State API, so this is a memo of the process.

IIIF is a set of open standards for delivering high-quality digital objects online at scale. It’s also the international community that makes it all work.

iiif.io

The IIIF Content State API is described in Current Awareness-R as follows:

"The IIIF Content State API" can generate links that specify in detail how an object should be displayed, including rotation angle and display position on the page image.

“IIIF Content State API”が正式公開

2022年3月16日、デジタル画像相互運用のための国際規格であるIIIFのウェブサイトにおいて、“IIIF Content State API”の正式公開が発表されました。これにより、正式公開されているIIIFのAPI仕様は6になったと述べ...

カレントアウェアネス・ポータル

Trying It Out

The "Shueitai / Letterpress Printing Digital Library" provides the IIIF Content State API.

秀英体・活版印刷デジタルライブラリー

archives.ichigaya-letterpress.jp

Documentation is available at the following location.

archives.ichigaya-letterpress.jp

Below is an explanation of usage examples.

Item Detail Page

For example, access the following page.

主要活字見本帳｜秀英体・活版印刷デジタルライブラリー

ベントン彫刻機による彫刻母型導入前の電胎母型で鋳造された活字を使用した最後の活字見本帳。発行日は手書きメモによる。

archives.ichigaya-letterpress.jp

Then click the link to the IIIF Curation Viewer.

Rectangle Selection

Use the IIIF Curation Viewer to select a rectangle.

For instructions on using the IIIF Curation Viewer, please refer to the following.

ICP Tutorial

Tutorial of IIIF Curation Platform for Beginner

ch-suzuki.com

Skipping a few steps, you can obtain the following information.

archives.ichigaya-letterpress.jp

The above is in the following format:

Base64 Encoding

For example, access the following site.

Base64 Encode and Decode - Online

Encode to Base64 format or decode from it with various advanced options. Our site has an easy to use online tool to convert your data.

Base64 Encode

Then, using the previously obtained information and the manifest URI of the item, encode the following JSON.

{
    "id": "https://archives.ichigaya-letterpress.jp/api/presentation/2/084cef1f7ddc/canvas/2#xywh=2148,813,312,304",
    "type": "Canvas",
    "partOf": [{
        "id": "https://archives.ichigaya-letterpress.jp/api/presentation/2/084cef1f7ddc/manifest.json",
        "type": "Manifest"
    }]
}

As a result, the following string is obtained.

ewogICAgImlkIjogImh0dHBzOi8vYXJjaGl2ZXMuaWNoaWdheWEtbGV0dGVycHJlc3MuanAvYXBpL3ByZXNlbnRhdGlvbi8yLzA4NGNlZjFmN2RkYy9jYW52YXMvMiN4eXdoPTIxNDgsODEzLDMxMiwzMDQiLAogICAgInR5cGUiOiAiQ2FudmFzIiwKICAgICJwYXJ0T2YiOiBbewogICAgICAgICJpZCI6ICJodHRwczovL2FyY2hpdmVzLmljaGlnYXlhLWxldHRlcnByZXNzLmpwL2FwaS9wcmVzZW50YXRpb24vMi8wODRjZWYxZjdkZGMvbWFuaWZlc3QuanNvbiIsCiAgICAgICAgInR5cGUiOiAiTWFuaWZlc3QiCiAgICB9XQp9