IEC 61966-2-5:2007 PDF

Name: IEC 61966-2-5:2007 — Multimedia systems and equipment - Colour measurement and management - Part 2-5: Colour management - Optional RGB colour space - opRGB
SKU: IEC 61966-2-5:2007
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Multimedia systems and equipment - Colour measurement and management - Part 2-5: Colour management - Optional RGB colour space - opRGB

Название (английский):

IEC 61966-2-5:2007

Multimedia systems and equipment - Colour measurement and management - Part 2-5: Colour management - Optional RGB colour space - opRGB

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 21
Дата публикации:: 7 ноября 2007 г.
Издание:: IEC IS 61966 edition 1 version 1
ICS:: 17.180.20

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Описание (английский):

is applicable to the encoding and communication of RGB colours optionally used in computer systems and similar applications by defining encoding transformations for use in defined reference conditions.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты IEC

Overview

IEC 61966-2-5:2007 - "Multimedia systems and equipment - Colour measurement and management - Part 2‑5: Colour management - Optional RGB colour space - opRGB" defines an optional wide‑gamut RGB encoding (opRGB) for use in computer systems and similar applications. The standard specifies reference display and viewing conditions and gives unambiguous encoding transformations between opRGB digital code values and CIE 1931 XYZ tristimulus values. Rendering beyond the defined reference conditions (device‑specific rendering intents) is explicitly out of scope.

Key topics and technical requirements

Reference conditions

Reference display luminance: 160 cd/m²
Display white point: D65 (x = 0.3127, y = 0.3290)
Display black level: 0.4 cd/m²
Display input/output characteristic (gamma): 2.2
Reference viewing illuminant and surround per ISO 3664 (ambient white point D50 for surround)

Encoding and bit depth

Defines conversion between N‑bit RGB code values (black = 0, white = 2^N − 1) and non‑linear opR′G′B′ values.
Supports typical 24‑bit (8‑bit per channel) and other N > 8 encodings.

Colourimetry transforms

Non‑linear gamma removal and application are specified (gamma ≈ 2.2).
Linear opRGB ↔ CIE 1931 XYZ transforms provided with explicit matrices:
- opR′G′B′ → XYZ matrix (e.g., X = 0.5767R + 0.1856G + 0.1882B)
- XYZ → opRGB inverse matrix (e.g., R = 2.0416X − 0.5650Y − 0.3447Z for 8‑bit)
Clipping policy: negative tristimulus values and values > 1.0 are clipped (simple clipping).

Annexes

Normative transformation to YCC for image compression and informative examples (sYCC), useful for workflows that combine opRGB with compressed encodings.

Applications and users

Who uses it

Professional photographers, prepress and DTP professionals, colour management engineers, software developers for image editing and workstation display pipelines.

Practical uses

Encoding and exchanging wide‑gamut RGB images where sRGB is too limiting.
Defining an unambiguous reference colour representation for high‑end displays and printing workflows.
Interoperability in pipelines that require precise conversion to/from CIE XYZ and compressed formats (YCC/sYCC).

Limitations

The standard provides colour encoding and reference conditions but does not mandate rendering algorithms for displays that do not meet the reference characteristics.

Related standards

IEC 61966‑2‑1 (sRGB) - default RGB colour space

CIE 1931 XYZ, CIE 15 (Colorimetry), CIE 122 (CRT/display relationships)

ISO 3664 (reference viewing conditions)

Keywords: IEC 61966-2-5, opRGB, optional RGB colour space, colour management, wide gamut RGB, CIE 1931 XYZ, D65, display reference conditions, encoding transformations.

IEC 61966-2-5:2007 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

SIST ISO 3664:2025

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