ISO 12232-2019 amd1-2020 PDF

Full title and description

St ISO 12232-2019 amd1-2020 — Photography — Digital still cameras — Determination of exposure index, ISO speed ratings, standard output sensitivity, and recommended exposure index (with Amendment 1: Determination of encoding‑relative sensitivity, 2020). This entry describes the third edition of ISO 12232 (2019) and its Amendment 1 (2020), which together specify test methods and reporting requirements used to assign and report exposure index and related sensitivity metrics for digital still cameras (monochrome and colour).

Abstract

This standard defines standardized methods for determining exposure index (EI), ISO speed ratings and ISO speed latitude, standard output sensitivity (SOS), and recommended exposure index (REI) for digital still cameras. The 2020 amendment adds the procedure for determining encoding‑relative sensitivity (ERS), refining how encoded image data relate to measured sensor exposure.

General information

• Status: Published.
• Publication date: ISO 12232 — February 2019 (Edition 3); Amendment 1 published June 2020 (Amd 1:2020).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 37.040.10 (photography — electronic still-picture imaging).
• Edition / version: Edition 3 (2019) with Amendment 1:2020 (encoding‑relative sensitivity).
• Number of pages: ISO 12232:2019 — 21 pages; Amendment 1:2020 — 3 pages (amendment document).

Scope

Specifies the methods and test conditions for assigning and reporting ISO speed ratings, ISO speed latitude, standard output sensitivity (SOS) and recommended exposure index (REI) for digital still cameras. It covers focal‑plane and scene‑luminance based measurements, required illumination conditions (daylight and tungsten reference illuminants), temperature/humidity considerations, and white balance handling. Amendment 1 adds procedures for determining encoding‑relative sensitivity (ERS) to relate encoded output levels back to exposure.

Key topics and requirements

• Definitions and terms for exposure index (EI), ISO speed, SOS and REI.
• Methods for focal‑plane measurement of exposure and alternative estimation from scene luminance.
• Test conditions and reference illuminants (daylight and tungsten) and environmental controls.
• Procedures to calculate ISO speed ratings and ISO speed latitude for digital still cameras.
• Requirements for reporting SOS and recommended exposure index values with test data and conditions.
• Amendment 1 requirement: determination and reporting of encoding‑relative sensitivity (ERS) to connect encoded image output to measured exposure.

Typical use and users

Used by camera manufacturers, imaging‑system test laboratories, conformance and certification bodies, camera firmware and image‑processing engineers, independent test labs and advanced users evaluating or comparing sensor sensitivity and exposure behaviour. Photographic equipment purchasers and technical writers also use it when documenting camera sensitivity and recommended exposure practices.

Related standards

Commonly used alongside other ISO/TC 42 standards for digital camera performance testing and image quality, for example ISO 12233 (resolution and spatial frequency response) and ISO 15739 (noise measurements). Many national bodies publish identical adoptions (e.g., BS ISO 12232:2019+A1:2020).

Keywords

ISO 12232, digital still cameras, exposure index, ISO speed rating, standard output sensitivity (SOS), recommended exposure index (REI), encoding‑relative sensitivity (ERS), camera testing, ISO/TC 42, photographic metrology.

FAQ

Q: What is this standard?

A: ISO 12232:2019 is an international standard that defines how to determine and report exposure index and related sensitivity metrics for digital still cameras; Amendment 1:2020 adds the method for determining encoding‑relative sensitivity (ERS).

Q: What does it cover?

A: It covers test methods, measurement conditions, calculation procedures and reporting formats for ISO speed ratings, ISO speed latitude, standard output sensitivity (SOS) and recommended exposure index (REI), plus ERS as introduced by the 2020 amendment.

Q: Who typically uses it?

A: Camera makers, test labs, conformity assessors, imaging engineers, and technical evaluators comparing camera sensitivity and exposure behavior.

Q: Is it current or superseded?

A: The 2019 edition (Edition 3) is the current published edition for ISO 12232 and it has one published amendment (Amd 1:2020). Users should check national catalogues or ISO for any later revisions; as of the cited publications the 2019 edition plus Amd 1:2020 are published and current.

Q: Is it part of a series?

A: It is part of the ISO/TC 42 suite of photographic and imaging standards that address camera characteristics and image quality (for example ISO 12233 on resolution and ISO 15739 on noise). Organizations often use several ISO/TC 42 standards together for comprehensive camera testing.

Q: What are the key keywords?

A: Exposure index (EI), ISO speed, ISO speed latitude, standard output sensitivity (SOS), recommended exposure index (REI), encoding‑relative sensitivity (ERS), digital still camera testing, ISO/TC 42.