# What is ISO 12233, what does its public scope say it covers, and what does the slanted-edge test actually do?

- id: art_01M5MRTH7H1M8Z0C6G8W9ZZG7X
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T02, T20 · tags: none
- updated: 2026-10-23T16:17:08.329Z
- url: https://veyrul.com/articles/art_01M5MRTH7H1M8Z0C6G8W9ZZG7X

ISO 12233:2017 (now withdrawn, replaced by ISO 12233:2024 per the ISO page snapshot) covers resolution and SFR measurement for electronic still cameras; the edge-based e-SFR method (in the standard since 2000) takes an edge profile, differentiates, windows and Fourier-transforms it, normalised to unity at zero frequency; the 2017 chart's 4:1 contrast edges are less likely to clip than the old chart's.

ISO 12233:2017 (now withdrawn, replaced by ISO 12233:2024 per the ISO page snapshot) covers resolution and SFR measurement for electronic still cameras; the edge-based e-SFR method (in the standard since 2000) takes an edge profile, differentiates, windows and Fourier-transforms it, normalised to unity at zero frequency; the 2017 chart's 4:1 contrast edges are less likely to clip than the old chart's.

Curator qualifications: Documents read 2026-10-22; standards texts paywalled; no chart measured. Imatest naming of 12233:2023 vs ISO 2024 edition label unresolved (producer).

Limitations: Documents read 2026-10-22; standards texts paywalled; no chart measured.

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

```json
{
  "citations": [
    {
      "url": "https://www.imatest.com/imaging/iso-12233/",
      "note": "Wayback id_ 2026-08-03 of iso.org/standard/71696; IS&T EI 2022 IQSP-357 paper; Imatest eSFR ISO instructions"
    },
    {
      "url": "https://www.imatest.com/docs/esfriso_instructions/",
      "note": "Wayback id_ 2026-08-03 of iso.org/standard/71696; IS&T EI 2022 IQSP-357 paper; Imatest eSFR ISO instructions"
    },
    {
      "url": "https://web.archive.org/web/20260803174933id_/https://www.iso.org/standard/71696.html",
      "note": "Wayback id_ 2026-08-03 of iso.org/standard/71696; IS&T EI 2022 IQSP-357 paper; Imatest eSFR ISO instructions"
    },
    {
      "url": "https://library.imaging.org/admin/apis/public/api/ist/website/downloadArticle/ei/34/9/IQSP-357",
      "note": "Wayback id_ 2026-08-03 of iso.org/standard/71696; IS&T EI 2022 IQSP-357 paper; Imatest eSFR ISO instructions"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] ISO 12233:2017 (now withdrawn, replaced by ISO 12233:2024 per the ISO page snapshot) covers resolution and SFR measurement for electronic still cameras; the edge-based e-SFR method (in the standard since 2000) takes an edge profile, differentiates, windows and Fourier-transforms it, normalised to unity at zero frequency; the 2017 chart's 4:1 contrast edges are less likely to clip than the old chart's. · locator: Wayback id_ 2026-08-03 of iso.org/standard/71696; IS&T EI 2022 IQSP-357 paper; Imatest eSFR ISO instructions · source: https://www.imatest.com/imaging/iso-12233/

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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