SIST EN 61966-12-1:2011
(Main)Multimedia systems and equipment - Colour measurement and management - Part 12: Metadata for identification of colour gamut (Gamut ID) (IEC 61966-12-1:2011)
Multimedia systems and equipment - Colour measurement and management - Part 12: Metadata for identification of colour gamut (Gamut ID) (IEC 61966-12-1:2011)
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 may 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.
Multimediasysteme und -geräte - Farbmessung und Farbmanagement - Teil 12-1: Metadaten für die Kennzeichnung des Farbumfangs (Gamut-ID) (IEC 61966-12-1:2011)
Systèmes et appareils multimédia - Mesure et gestion de la couleur - Partie 12-1: Métadonnées d'identification de gamme de couleurs (Gamut ID) (CEI 61966-12-1:2011)
La CEI 61966-12-1:2011 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 servant à afficher ce contenu. 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. La présente version bilingue (2011-12), correspond à la version anglaise monolingue publiée en 2011-01.
Večpredstavnostni sistemi in oprema - Merjenje in urejanje barv - 12. del: Metapodatki za ugotavljanje barvne lestvice (Gamut ID) (IEC 61966-12-1:2011)
Ta del IEC 61966 določa barvno lestvico sheme metapodatkov za videosisteme in podobne uporabe.
Metapodatki so lahko povezani z vsebino široke videobarvne lestvice ali z delom opreme za prikaz vsebine.
Kadar so metapodatki barvne lestvice povezani z vsebino, določajo lestvico, za katero je vsebina ustvarjena. Lahko jih uporablja prikazovalnik za nadzorovano reprodukcijo barv, tudi če je barvna lestvica prikazovalnika različna od barvne lestvice vsebine.
Kadar so metapodatki barvne lestvice povezani s prikazovalnikom, določajo barvno lestvico prikazovalnika. Lahko se uporabljajo med ustvarjanjem vsebine, kar omogoča izboljšano reprodukcijo barv.
Metapodatki barvne lestvice lahko zajemajo povezane informacije o kodiranju barv, ki vsebujejo vse informacije, potrebne za nadzorovano reprodukcijo barv, kadar take informacije niso zagotovljene s specifikacijo kodiranja barv.
Shema metapodatkov barvne lestvice zagotavlja nadgradljive rešitve. Prožnejše rešitve, na primer, se bodo uporabile za strokovno uporabo, medtem ko se bodo preprostejše rešitve uporabile za potrošniško uporabo s preprostejšo vpeljavo proizvoda.
Ta del IEC 61966 opredeljuje samo shemo metapodatkov barvne lestvice. Rešitve, ki so značilne za prodajalce, za izdelavo in končno uporabo teh metapodatkov, so dovoljene.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 61966-12-1:2011
01-julij-2011
9HþSUHGVWDYQRVWQLVLVWHPLLQRSUHPD0HUMHQMHLQXUHMDQMHEDUYGHO
0HWDSRGDWNL]DXJRWDYOMDQMHEDUYQHOHVWYLFH *DPXW,' ,(&
Multimedia systems and equipment - Colour measurement and management - Part 12:
Metadata for identification of colour gamut (Gamut ID) (IEC 61966-12-1:2011)
Multimediasysteme und -geräte - Farbmessung und Farbmanagement - Teil 12-1:
Metadaten für die Kennzeichnung des Farbumfangs (Gamut-ID) (IEC 61966-12-1:2011)
Systèmes et appareils multimédia - Mesure et gestion de la couleur - Partie 12-1:
Métadonnées d'identification de gamme de couleurs (Gamut ID) (CEI 61966-12-1:2011)
Ta slovenski standard je istoveten z: EN 61966-12-1:2011
ICS:
17.180.20 Barve in merjenje svetlobe Colours and measurement of
light
33.160.60 9HþSUHGVWDYQL PXOWLPHGLMVNL Multimedia systems and
VLVWHPLLQRSUHPD]D teleconferencing equipment
WHOHNRQIHUHQFH
SIST EN 61966-12-1:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 61966-12-1:2011
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SIST EN 61966-12-1:2011
EUROPEAN STANDARD
EN 61966-12-1
NORME EUROPÉENNE
March 2011
EUROPÄISCHE NORM
ICS 17.180.20; 33.160
English version
Multimedia systems and equipment -
Colour measurement and management -
Part 12-1: Metadata for identification of colour gamut (Gamut ID)
(IEC 61966-12-1:2011)
Systèmes et appareils multimédia - Multimediasysteme und -geräte -
Mesure et gestion de la couleur - Farbmessung und Farbmanagement -
Partie 12-1: Métadonnées d'identification Teil 12-1: Metadaten für die
de gamme de couleurs (Gamut ID) Kennzeichnung des Farbumfangs
(CEI 61966-12-1:2011) (Gamut-ID)
(IEC 61966-12-1:2011)
This European Standard was approved by CENELEC on 2011-02-16. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61966-12-1:2011 E
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SIST EN 61966-12-1:2011
EN 61966-12-1:2011 - 2 -
Foreword
The text of document 100/1757/FDIS, future edition 1 of IEC 61966-12-1, prepared by technical area 2,
Colour measurement and management, of IEC TC 100, Audio, video and multimedia systems and
equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
EN 61966-12-1 on 2011-02-16.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2011-11-16
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2014-02-16
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61966-12-1:2011 was approved by CENELEC as a European
Standard without any modification.
__________
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SIST EN 61966-12-1:2011
- 3 - EN 61966-12-1:2011
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application 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.
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
IEC 60050-845 1987 International Electrotechnical Vocabulary - -
(IEV) -
Chapter 845: Lighting
IEC 61966-2-4 2006 Multimedia systems and equipment - Colour EN 61966-2-4 2006
measurement and management -
Part 2-4: Colour management - Extended-
gamut YCC colour space for video
applications - xvYCC
ISO 15076-1 2005 Image technology colour management - - -
Architecture, profile format
and data structure -
Part 1: Based on ICC.1:2004-10
ISO 22028-1 2004 Photography and graphic technology - - -
Extended colour encodings for digital image
storage, manipulation and interchange -
Part 1: Architecture and requirements
ITU-R BT.709-5 2002 Parameter values for the HDTV standards - -
for production and international programme
exchange
CIE 15 2004 Colorimetry - -
SMPTE 274M 2005 SMPTE Standard for Television - - -
1920 x 1080 Image Sample Structure, Digital
Representation and Digital Timing Reference
Sequences for Multiple Picture Rates
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SIST EN 61966-12-1:2011
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SIST EN 61966-12-1:2011
IEC 61966-12-1
®
Edition 1.0 2011-01
INTERNATIONAL
STANDARD
colour
inside
Multimedia systems and equipment – &olour measurement and management –
Part 12-1: Metadata for identification of colour gamut (Gamut ID)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
W
ICS 17.180.20; 33.160 ISBN 978-2-88912-309-4
® Registered trademark of the International Electrotechnical Commission
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SIST EN 61966-12-1:2011
– 2 – 61966-12-1 Ó IEC:2011(E)
CONTENTS
FOREW ORD . 4
INTRODUCTION . 6
1 Sc o pe . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Abbrev iations . 8
5 Overview . 8
6 Header of Gamut ID metadata. 9
7 Description of gamut geometry (full profile) . 10
7.1 General . 10
7.2 Gamut geometry . 11
7.3 Header of description of gamut geometry. 12
7.4 Gamut instances . 14
7.5 Gamut hulls . 16
7.6 Gamut component . 17
7.6.1 General . 17
7.6.2 Packing of face indices . 17
7.7 Faces . 18
7.7.1 General . 18
7.7.2 Packing of vertex indices . 19
7.8 Vertices . 19
7.8.1 General . 19
7.8.2 Packing of colour space coordinates for vertices . 20
8 Description of gamut geometry (medium and simple profiles) . 21
8.1 General . 21
8.2 Medium profile . 21
8.3 Simple profile . 21
9 Description of colour reproduction . 22
Annex A (informative) Size of Gamut ID metadata . 25
Annex B (informative) Motivation and requirements . 26
Annex C (informative) Use of profiles . 32
Annex D (informative) Example of Gamut ID metadata in simple profile . 34
Bibliography . 38
Figure 1 – Logical structure of the description of gamut geometry (full profile) . 11
Figure B.1 – Scope of Gamut ID – Generation and use of metadata are not specified . 27
Figure B.2 – Example of a description of gamut geometry in CIEXYZ colour space
consisting of a set of triangular faces. 28
Figure B.3 – Example of a gamut with identified ridge due to colorant channels . 30
Figure B.4 – Example of a non-convex gamut with two convex gamut hulls. 31
Table 1 – Format of Gamut ID metadata . 8
Table 2 – Header of Gamut ID metadata . 9
Table 3 – Bit depth for encoding of a colour space coordinate . 10
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SIST EN 61966-12-1:2011
61966-12-1 Ó IEC:2011(E) – 3 –
Table 4 – Description of gamut geometry . 12
Table 5 – Header of description of gamut geometry . 13
Table 6 – Gamut instances . 14
Table 7 – ith Gamut instance . 15
Table 8 – Gamut hulls . 16
Table 9 – hth gamut hull . 16
Table 10 – Definition of gamut components . 17
Table 11 – cth gamut component. 17
Table 12 – Example for packing of gamut components . 18
Table 13 – Definition of faces . 18
Table 14 – Example for packing of faces . 19
Table 15 – Vertices. 20
Table 16 – Packing of 10-bit colour space coordinates . 20
Table 17 – Packing of 12-bit colour space coordinates . 21
Table 18 – Description of gamut geometry (simple profile) . 22
Table 19 – Header of description of gamut geometry (simple profile) . 22
Table 20 – Definition of vertices (simple profile) . 22
Table B.1 – Requirements and Gamut ID features . 29
Table C.1 – Profiles for the description of gamut geometry . 32
Table D.1 – Colour gamut for digital cinema . 34
Table D.2 – Example for the header . 34
Table D.3 – Example for the header of description of gamut geometry . 35
Table D.4 – Example of definition of vertices . 35
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– 4 – 61966-12-1 Ó IEC:2011(E)
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
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent 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.
The text of this standard is based on the following documents:
FDIS Report on voting
100/1757/FDIS 100/1776/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
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SIST EN 61966-12-1:2011
61966-12-1 Ó IEC:2011(E) – 5 –
A list of alll parts of 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 amendment and the base publication will
remain unchanged until the stability date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this document may be issued at a later date.
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 publication using a colour printer.
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SIST EN 61966-12-1:2011
– 6 – 61966-12-1 Ó IEC:2011(E)
INTRODUCTION
New technologies in capturing and displaying wide-gamut colour images enable a new market
of wide-gamut video colour content creation. Recent video standards for wide gamut colour
space encoding such as 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). 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, the IEC standard Gamut ID (IEC 61966-12-1) 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 standard enables video systems defining their own colour gamut. This standard defines
necessary metadata that allows managing inhomogeneous video systems with different colour
gamuts. This standard generalizes existing colour space encoding standards having a fixed
colour gamut.
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SIST EN 61966-12-1:2011
61966-12-1 Ó IEC:2011(E) – 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 may 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 referenced documents are indispensable for the application 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):1987, 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 15076-1:2005 Image technology colour management – Architecture, profile format and
data structure – Part 1: Based on ICC.1:2004-10
ISO 22028-1:2004, Photography and graphic technology – Extended colour encodings for
digital image storage, manipulation and interchange – Part 1: Architecture and requirements
ITU-R BT.709-5:2002, Parameter values for the HDTV standards for production and
international programme exchange
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SIST EN 61966-12-1:2011
– 8 – 61966-12-1 Ó IEC:2011(E)
CIE 15:2004, Colorimetry
SMPTE 274M:2005, SMPTE Standard for Television - 1920 x 1080 Image Sample Structure,
Digital Representation and Digital Timing Reference Sequences for Multiple Picture Rates
3 Terms and definitions
For the purposes of this document, the following terms and definitions as well as the terms
and definitions of colour space, illuminance, luminance, tristimulus, and other related lighting
terms of IEC 60050(845) apply.
3.1
content
video content in production, post-production or consumption
3.2
gamut
a solid in a colour space
3.3
gamut boundary description
description of the boundary of a colour gamut
3.4
radiometrically-linear colour space coordinates
colour space coordinates that are linear with respect to image radiance
4 Abbreviations
GBD Gamut Boundary Description
LSB Least Significant Bit
MSB Most Significant Bit
GI Gamut Instance
GH Gamut Hull
GC Gamut Component
5 Overview
This standard 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.
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 6 specifies the header of Gamut ID metadata.
Clauses 7 and 8 specify the description of gamut geometry that corresponds to one of three
profiles as listed below:
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ID_GBD_SPACE
ID_PRECISION
ID_PROFILE
SIST EN 61966-12-1:2011
61966-12-1 Ó IEC:2011(E) – 9 –
· full profile;
· medium profile;
· simple profile.
Clause 7 specifies the full profile of the description of gamut geometry. The medium and
simple profiles are specified in Clause 8.
Clause 9 specifies the description of colour reproduction.
6 Header of Gamut ID metadata
The Gamut ID metadata starts with the header shown in Table 2.
Table 2 – Header of Gamut ID metadata
Byte # Size Sym-
Description Values
hex bytes bols
7 6 5 4 3 2 1 0
00 1 N, P R R = reserved = 0b0 (1bit)
ID_PFOFILE (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: Reserved
0b101: Reserved
0b110: Reserved
0b111: Reserved
01 2 ID_G Byte # of start of the description [0h0009;0hFFFF]
of gamut geometry
03 2 ID_E Byte # of start of the description [0;0hFFFF]
of colour reproduction
05 2 Reserved. Shall be zero. 0h0000
07 2 Reserved. Shall be zero. 0h0000
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ID_PROFILE indicates the profile of the Gamut ID metadata and shall be one of
· 0b00: Full profile,
· 0b01:Medium profile,
· 0b11: Simple profile.
ID_GBD_SPACE indicates the colour space and the colour space encoding for colour vertices
in the description of gamut geometry and shall be one of
· 0b000: ITU-R BT.709, RGB space, encoding according to SMPTE 274M,
· 0b001: xvYCC-601, YCbCr space, encoding according to IEC 61966-2-4 – SD,
· 0b010: xvYCC-709, YCbCr space, encoding according to IEC 61966-2-4 – HD,
· 0b011: XYZ; encoding shall use the XYZNumber format of ICC profiles specified in
ISO 15076-1:2005 taking 12 bytes for one XYZ triple.
aID_PRECISION and ID_GBD_SPACE specify according to Table 3 the number N of bits that
are used per colour channel in order to define the coordinates of a colour in a colour space.
Table 3 – Bit depth for encoding of a colour space coordinate
ID_GBD_SPACE ID_PRECISION Bit depth N
0b000 or 0b00 8 bits
0b001 or
0b01 10 bits
0b010
0b10 12 bits
0b11 Reserved
0b011 Any 32 bits
0b100 or Any Reserved
0b101 or
0b110 or
0b111
ID_G indicates the offset in bytes from the beginning of Gamut ID metadata to the beginning
of the description of gamut geometry.
If ID_E is different from 0h0000, the Gamut ID metadata contains a description of colour
reproduction and ID_E indicates the offset in bytes from the beginning of Gamut ID metadata
to the beginning of the description of colour reproduction. If ID_E has the value 0h0000, the
Gamut ID metadata does not contain a description of colour reproduction.
7 Description of gamut geometry (full profile)
7.1 General
In the header of Gamut ID metadata, if ID_PROFILE equals 0b00, the description of gamut
geometry shall correspond to the full profile.
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61966-12-1 Ó IEC:2011(E) – 11 –
7.2 Gamut geometry
The description of gamut geometry of the Gamut ID metadata describes the boundary of the
actual colour gamut. The description of gamut geometry starts at byte number ID_G.
The description of gamut geometry contains five sets of different elements:
· gamut instances,
· gamut hulls,
· gamut components,
· faces, and
· vertices.
The logical structure of the Gamut ID description of colour gamut is shown in Figure 1.
Gamut
component Faces Verticles
(GC) (GC) (GC)
Gamut
Gamut hull
V0
GC0 F0
instance (GH)
V1
(GI)
F1
GC1
V2
GC2 F2
GH0
V3
GC3
GI0 GH1 F3
V4
GC4 F4
GI1 GH2
…. …. …. …. ….
IEC 2891/10
Figure 1 – Logical structure of the description of ga
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