Multimedia systems and equipment - Colour measurement and management - Part 12-1: Metadata for identification of colour gamut (Gamut ID)

IEC 61966-12-1:2020 is available as IEC 61966-12-1:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 61966-12-1:2020 defines the colour gamut metadata scheme for video systems and similar applications. The metadata can be associated with wide-gamut video colour content or to a piece of equipment to display the content. When associated with content, the colour gamut metadata defines the gamut for which the content was created. It can be used by the display for controlled colour reproduction even if the display’s colour gamut is different from that of the content. When associated with a display, the colour gamut metadata defines the display colour gamut. It can be used during content creation to enable improved colour reproduction. The colour gamut metadata can cover associated colour encoding information, which includes all information required for a controlled colour reproduction, when such information is not provided by the colour encoding specification. The colour gamut metadata scheme provides scalable solutions. For example, more flexible solutions will be used for the professional use, while much simpler solutions will be used for consumer use with easier product implementation. This part of IEC 61966 only defines the colour gamut metadata scheme. Vendor-specific solutions for creation and end-use of this metadata are allowed. IEC 61966-12-1:2020 cancels and replaces the first edition published in 2011. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) ITU-R BT.2020 colour spaces added in Clause 6;
b) ITU-R BT.2100 colour spaces added in Clause 6.

Systèmes et appareils multimédias - Mesure et gestion de la couleur - Partie 12-1: Métadonnées d'identification des gammes de couleurs (Gamut ID)

IEC 61966-12-1:2020 est disponible sous forme de IEC 61966-12-1:2020 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 61966-12-1:2020 définit l'agencement des métadonnées des gammes de couleurs destiné aux systèmes vidéo et applications similaires. Les métadonnées peuvent être associées à un contenu vidéo à gamme de couleurs étendue ou à un appareil qui sert à afficher ce contenu. Lorsqu'elles sont associées au contenu, les métadonnées de gamme de couleurs définissent la gamme de couleurs pour laquelle le contenu a été créé. Elles peuvent être utilisées par l'écran pour piloter la reproduction des couleurs, même si la gamme de couleurs de l'écran est différente de celle du contenu. Lorsqu'elles sont associées à un écran, les métadonnées de gamme de couleurs définissent la gamme des couleurs de l'écran. Elles peuvent servir pendant la création du contenu, pour permettre une meilleure reproduction des couleurs. Les métadonnées de gammes de couleurs peuvent intégrer des informations associées de codage des couleurs, dont toutes celles nécessaires à une reproduction contrôlée des couleurs, lorsque ces informations ne sont pas fournies par la spécification du codage des couleurs. L'agencement des métadonnées des gammes de couleurs apporte des solutions évolutives. Par exemple, des solutions plus souples servent à un usage professionnel, alors que des solutions beaucoup plus simples servent au grand public, avec une mise en œuvre plus facile du produit. La présente partie de l'IEC 61966 ne définit que l'agencement des métadonnées des gammes de couleurs. Des solutions spécifiques à un fournisseur, pour la création et l'usage final de ces métadonnées, sont admises. L'IEC 61966-12-1:2020 annule et remplace la première édition parue en 2011. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) ajout des espaces de couleurs UIT-R BT.2020 à l'Article 6;
b) ajout des espaces de couleurs UIT-R BT.2100 à l'Article 6.

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Published
Publication Date
20-Sep-2020
Current Stage
PPUB - Publication issued
Completion Date
21-Sep-2020
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IEC 61966-12-1
Edition 2.0 2020-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Multimedia systems and equipment – Colour measurement and management –
Part 12-1: Metadata for identification of colour gamut (Gamut ID)
Systèmes et appareils multimédias – Mesure et gestion de la couleur –
Partie 12-1: Métadonnées d'identification des gammes de couleurs (Gamut ID)
IEC 61966-12-1:2020-09(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61966-12-1
Edition 2.0 2020-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Multimedia systems and equipment – Colour measurement and management –
Part 12-1: Metadata for identification of colour gamut (Gamut ID)
Systèmes et appareils multimédias – Mesure et gestion de la couleur –
Partie 12-1: Métadonnées d'identification des gammes de couleurs (Gamut ID)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.180.20; 33.160.40 ISBN 978-2-8322-8762-0

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61966-12-1:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms, definitions and abbreviated terms ........................................................................ 8

3.1 Terms and definitions .............................................................................................. 8

3.2 Abbreviated terms ................................................................................................... 8

4 Overview ......................................................................................................................... 8

5 Header of Gamut ID metadata ......................................................................................... 9

6 Description of gamut geometry (full profile) .................................................................... 12

6.1 General ................................................................................................................. 12

6.2 Gamut geometry ................................................................................................... 12

6.3 Header of description of gamut geometry .............................................................. 14

6.4 Gamut Instances ................................................................................................... 15

6.5 Gamut Hulls .......................................................................................................... 17

6.6 Gamut Component ................................................................................................ 18

6.6.1 General ......................................................................................................... 18

6.6.2 Packing of face indices .................................................................................. 19

6.7 Faces.................................................................................................................... 20

6.7.1 General ......................................................................................................... 20

6.7.2 Packing of vertex indices ............................................................................... 21

6.8 Vertices ................................................................................................................ 21

6.8.1 General ......................................................................................................... 21

6.8.2 Packing of colour space coordinates for vertices ........................................... 22

7 Description of gamut geometry (medium and simple profiles) ........................................ 23

7.1 General ................................................................................................................. 23

7.2 Medium profile ...................................................................................................... 23

7.3 Simple profile ........................................................................................................ 23

8 Description of colour reproduction ................................................................................. 24

Annex A (informative) Size of Gamut ID metadata ............................................................... 27

Annex B (informative) Motivation and requirements ............................................................. 28

B.1 History .................................................................................................................. 28

B.2 Motivation ............................................................................................................. 28

B.3 Scope of Gamut ID metadata ................................................................................ 29

B.4 Requirements ....................................................................................................... 29

B.5 Structure ............................................................................................................... 30

B.6 Specific features ................................................................................................... 32

Annex C (informative) Use of profiles ................................................................................... 34

C.1 Gamut ID profiles .................................................................................................. 34

C.2 Medium profile ...................................................................................................... 34

C.3 Simple profile ........................................................................................................ 35

Annex D (informative) Example of Gamut ID metadata in simple profile ............................... 36

Bibliography .......................................................................................................................... 40

---------------------- Page: 4 ----------------------
IEC 61966-12-1:2020 © IEC 2020 – 3 –

Figure 1 – Logical structure of the description of gamut geometry (full profile) ...................... 13

Figure B.1 – Scope of Gamut ID – Generation and use of metadata are not specified ........... 29

Figure B.2 – Example of a description of gamut geometry in CIEXYZ colour space

consisting of a set of triangular faces .................................................................................... 30

Figure B.3 – Example of a gamut with identified ridge due to colorant channels .................... 33

Figure B.4 – Example of a non-convex gamut with two convex Gamut Hulls.......................... 33

Table 1 – Format of Gamut ID metadata ................................................................................. 9

Table 2 – Header of Gamut ID metadata ............................................................................... 10

Table 3 – Bit depth for encoding of a colour space coordinate .............................................. 12

Table 4 – Description of gamut geometry .............................................................................. 14

Table 5 – Header of description of gamut geometry .............................................................. 14

Table 6 – Gamut Instances ................................................................................................... 15

Table 7 – ith Gamut Instance ................................................................................................ 16

Table 8 – Gamut Hulls .......................................................................................................... 17

Table 9 – hth Gamut Hull ...................................................................................................... 18

Table 10 – Definition of Gamut Components ......................................................................... 19

Table 11 – cth Gamut Component ......................................................................................... 19

Table 12 – Example for packing of Gamut Components ........................................................ 20

Table 13 – Definition of faces ............................................................................................... 20

Table 14 – Example for packing of faces ............................................................................... 21

Table 15 – Vertices ............................................................................................................... 22

Table 16 – Packing of 10-bit colour space coordinates .......................................................... 22

Table 17 – Packing of 12-bit colour space coordinates .......................................................... 23

Table 18 – Description of gamut geometry (simple profile) .................................................... 24

Table 19 – Header of description of gamut geometry (simple profile) .................................... 24

Table 20 – Definition of vertices (simple profile) .................................................................... 24

Table 21 – Header of description of colour reproduction ....................................................... 25

Table B.1 – Requirements and Gamut ID features ................................................................ 32

Table C.1 – Profiles for the description of gamut geometry ................................................... 34

Table D.1 – Colour gamut for digital cinema ......................................................................... 36

Table D.2 – Example for the header ...................................................................................... 36

Table D.3 – Example for the header of description of gamut geometry .................................. 37

Table D.4 – Example of definition of vertices ........................................................................ 37

Table D.5 – Encoded colour space coordinates for vertices .................................................. 37

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– 4 – IEC 61966-12-1:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MULTIMEDIA SYSTEMS AND EQUIPMENT –
COLOUR MEASUREMENT AND MANAGEMENT –
Part 12-1: Metadata for identification of colour gamut (Gamut ID)
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

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indispensable for the correct application of this publication.

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rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61966-12-1 has been prepared by technical area 2: Colour

measurement and management, of IEC technical committee 100: Audio, video and multimedia

systems and equipment.

This second edition cancels and replaces the first edition published in 2011. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) ITU-R BT.2020 colour spaces added in Clause 6;
b) ITU-R BT.2100 colour spaces added in Clause 6.
The text of this International Standard is based on the following documents:
CDV Report on voting
100/3126/CDV 100/3375/RVC
---------------------- Page: 6 ----------------------
IEC 61966-12-1:2020 © IEC 2020 – 5 –

Full information on the voting for the approval of this International Standard can be found in the

report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 61966 series, published under the general title Multimedia systems

and equipment – colour measurement and management, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct understanding

of its contents. Users should therefore print this document using a colour printer.

---------------------- Page: 7 ----------------------
– 6 – IEC 61966-12-1:2020 © IEC 2020
INTRODUCTION

New technologies in capturing and displaying wide-gamut colour images enable a new market

of wide-gamut video colour content and high dynamic range video content creation. Recent

video standards for wide gamut colour space encoding such as ITU-R BT.2020 (UHDTV) and

IEC 61966-2-4 (xvYCC) were established in order to be able to distribute content with a colour

gamut that is extended with respect to classical colour gamuts such as defined by colorimetry

standards ITU-R BT.601 (standard-definition television) and ITU-R BT.709 (high-definition

television). Recent video standards for high dynamic range (HDR) colour space encoding, such

as ITU-R BT.2100, were established in order to be able to distribute content with a colour gamut

and a dynamic range that are both extended with respect to classical colour encoding, such as

that defined by ITU-R BT.709. With the increasing popularity of wide gamut and high dynamic

range content and displays, the variety of colour gamuts of displays is expected to increase.

This issue can be an obstacle for adopting wide-gamut video colour content in professional

content creation since the compatibility of the content to the employed displays as well as the

compatibility among different displays is not ensured. The term display includes here any video

colour reproduction equipment, such as direct view displays and projectors. Thanks to

improvements of technology, the variety of colour gamut and colour reproduction capacities of

displays increases, while the colour gamut and the colour encoding rules of existing colour

space encoding standards are fixed.

To address this issue, this document specifies a colour gamut metadata scheme for video

systems including information for colour reproduction. This metadata can amend a video

content or a display. More specifically, improvements can be achieved if the wide-gamut colour

content is created with the knowledge of the display colour gamut as well as if the colour

reproduction in the display is done with the knowledge of the colour gamut of the pictorial

content.

This document permits video systems to define their own colour gamut. This document defines

necessary metadata that allows managing inhomogeneous video systems with different colour

gamuts. This document generalizes existing colour space encoding standards having a fixed

colour gamut.
---------------------- Page: 8 ----------------------
IEC 61966-12-1:2020 © IEC 2020 – 7 –
MULTIMEDIA SYSTEMS AND EQUIPMENT –
COLOUR MEASUREMENT AND MANAGEMENT –
Part 12-1: Metadata for identification of colour gamut (Gamut ID)
1 Scope

This part of IEC 61966 defines the colour gamut metadata scheme for video systems and similar

applications.

The metadata can be associated with wide-gamut video colour content or to a piece of

equipment to display the content.

When associated with content, the colour gamut metadata defines the gamut for which the

content was created. It can be used by the display for controlled colour reproduction even if the

display’s colour gamut is different from that of the content.

When associated with a display, the colour gamut metadata defines the display colour gamut.

It can be used during content creation to enable improved colour reproduction.

The colour gamut metadata can cover associated colour encoding information, which includes

all information required for a controlled colour reproduction, when such information is not

provided by the colour encoding specification.

The colour gamut metadata scheme provides scalable solutions. For example, more flexible

solutions will be used for the professional use, while much simpler solutions will be used for

consumer use with easier product implementation.

This part of IEC 61966 only defines the colour gamut metadata scheme. Vendor-specific

solutions for creation and end-use of this metadata are allowed.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies.

For undated references, the latest edition of the referenced document (including any

amendments) applies.
IEC 60050-845, International electrochnical vocabulary – Chapter 845: Lighting
IEC 61966-2-4:2006, Multimedia systems and equipment – Colour measurement and

management – Part 2-4: Colour management – Extended-gamut YCC colour space for video

applications – xvYCC

ISO 15076-1:2010, Image technology colour management – Architecture, profile format and

data structure – Part 1: Based on ICC.1:2010

ITU-R BT.709, Parameter values for the HDTV standards for production and international

programme exchange
CIE 15:2004, Colorimetry
---------------------- Page: 9 ----------------------
– 8 – IEC 61966-12-1:2020 © IEC 2020

SMPTE 274M:2005, SMPTE Standard for Television - 1920 x 1080 Image Sample Structure,

Digital Representation and Digital Timing Reference Sequences for Multiple Picture Rates

ITU-R BT.2020, Parameter values for ultra-high definition television systems for production and

international programme exchange

ITU-R BT.2100, Image parameter values for high dynamic range television for use in production

and international programme exchange
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60050-845 and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
content
video content in production, post-production or consumption
3.1.2
gamut
solid in a colour space

Note 1 to entry: A solid in a colour space, such as specified by ITU-R BT.2100, can contain colours with high

luminance.
3.1.3
gamut boundary description
description of the boundary of a colour gamut
3.1.4
radiometrically-linear colour space coordinates
colour space coordinates that are linear with respect to image radiance
3.2 Abbreviated terms
GBD gamut boundary description
LSB least significant bit
MSB most significant bit
GI gamut instance
GH gamut hull
GC gamut component
4 Overview

This document specifies metadata called "Gamut ID metadata" providing information on an

actual colour gamut.

The Gamut ID metadata contains four parts and its format is summarized in Table 1.

---------------------- Page: 10 ----------------------
IEC 61966-12-1:2020 © IEC 2020 – 9 –
Table 1 – Format of Gamut ID metadata
Byte # Metadata content
hex
0h0000 Header of Gamut ID metadata
ID_G Description of gamut geometry
ID_E Description of colour reproduction
Clause 5 specifies the header of Gamut ID metadata.

Clauses 6 and 7 specify the description of gamut geometry that corresponds to one of three

profiles as listed below:
• full profile;
• medium profile;
• simple profile.

Clause 6 specifies the full profile of the description of gamut geometry. The medium and simple

profiles are specified in Clause 7.
Clause 8 specifies the description of colour reproduction.
Annex A discusses the size of Gamut ID metadata.
Annex B gives background information.
Annex C discusses the use of simple, medium and full profiles.
5 Header of Gamut ID metadata
The Gamut ID metadata starts with the header shown in Table 2.
---------------------- Page: 11 ----------------------
ID_GBD_SPACE
ID_PRECISION
ID_PROFILE
– 10 – IEC 61966-12-1:2020 © IEC 2020
Table 2 – Header of Gamut ID metadata
Byte # Size Symbols Description Values
hex Bytes
7 6 5 4 3 2 1 0
00 1 N, P R R = reserved = 0b0 (1bit)
ID_PROFILE (2 bits):
0b00: Full profile
0b01: Medium profile
0b10: Simple profile
0b11: Reserved
ID_PRECISION (2 bits):
0b00: 8 bits
0b01: 10 bits
0b10: 12 bits
0b11: Reserved
ID_GBD_SPACE (3bits):
0b000: ITU-R BT.709 RGB
0b001: xvYCC-601
(IEC 61966-2-4 -SD) YCC
0b010: xvYCC-709
(IEC 61966-2-4 -HD) YCC
0b011: XYZ (see below)
0b100: ITU-R BT.2020 R’G’B’
0b101: ITU-R BT.2020 Y’C’ C’
B R
0b110: ITU-R BT.2020
Y ’C’ C’
C BC RC
0b111: ID_GBD_SPACE_EXT
01 2 ID_G Byte # of start of the description of gamut [0h0009;0hFFFF]
geometry
03 2 ID_E Byte # of start of the description of colour [0;0hFFFF]
reproduction
05 1 ID_GBD_SPACE_EXT 0h00: ITU-R BT.2100 R’G’B’ PQ
narrow
0h01: ITU-R BT.2100 R’G’B’ PQ
full
0h02: ITU-R BT.2100 R’G’B’
HLG narrow
0h03: ITU-R BT.2100 R’G’B’
HLG full
0h04: ITU-R BT.2100 Y’C’ C’
B R
PQ narrow
0h05: ITU-R BT.2100 Y’C’ C’
B R
PQ full
0h06: ITU-R BT.2100 Y’C’ C’
B R
HLG
...

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