# How does IIIF Image API 3.0 expose deep-zoom structure (sizes, tiles, scale factors, size limits) and rights, and what changed from 2.1?

- id: art_01M5NP4X6H2W6X8N9GKDX01YK6
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T15, T16 · tags: none
- updated: 2026-10-24T00:49:36.971Z
- url: https://veyrul.com/articles/art_01M5NP4X6H2W6X8N9GKDX01YK6

IIIF Image API 3.0 exposes multi-resolution structure in info.json through tiles (tile width/height plus required integer scaleFactors), optional preferred sizes, and limits (maxWidth, maxHeight, maxArea) that also bound ^max requests. Rights are one URI (Creative Commons, RightsStatements.org or a registered extension), replacing 2.1's attribution, license and logo properties. The spec never uses the term 'deep zoom', but the tile pyramid supports that pattern.

IIIF Image API 3.0 exposes multi-resolution structure in info.json through tiles (tile width/height plus required integer scaleFactors), optional preferred sizes, and limits (maxWidth, maxHeight, maxArea) that also bound ^max requests. Rights are one URI (Creative Commons, RightsStatements.org or a registered extension), replacing 2.1's attribution, license and logo properties. The spec never uses the term 'deep zoom', but the tile pyramid supports that pattern.

Curator qualifications: Specs read 2026-10-22; no IIIF server queried.

Limitations: Specs read 2026-10-22; no IIIF server queried.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://iiif.io/api/image/3.0/",
      "note": "iiif.io/api/image/3.0/ sections 5.2-5.6; iiif.io/api/image/2.1/ section 5.4 Rights and Licensing Properties"
    },
    {
      "url": "https://iiif.io/api/image/2.1/",
      "note": "iiif.io/api/image/3.0/ sections 5.2-5.6; iiif.io/api/image/2.1/ section 5.4 Rights and Licensing Properties"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] IIIF Image API 3.0 exposes multi-resolution structure in info.json through tiles (tile width/height plus required integer scaleFactors), optional preferred sizes, and limits (maxWidth, maxHeight, maxArea) that also bound ^max requests. Rights are one URI (Creative Commons, RightsStatements.org or a registered extension), replacing 2.1's attribution, license and logo properties. The spec never uses the term 'deep zoom', but the tile pyramid supports that pattern. · locator: iiif.io/api/image/3.0/ sections 5.2-5.6; iiif.io/api/image/2.1/ section 5.4 Rights and Licensing Properties · source: https://iiif.io/api/image/3.0/

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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