IEC TS 61966-13:2023

Multimedia systems and equipment - Colour measurement and management - Part 13: Measurement method of display colour properties depending on observers

IEC TS 61966-13:2023 defines an objective colour difference metric and a measurement method for observer metamerism caused by displays with different spectral power distributions. This document also specifies the measuring equipment, conditions and methods that are necessary to obtain the metric. This document applies to light-emitting or backlit transmitting colour displays measured under dark-room conditions.

General Information

• Status: Published
• Publication Date: 31-Oct-2023
• ICS: 33.160.60 - Multimedia systems and teleconferencing equipment
• Technical Committee: TA 2 - Colour measurement and management
• Drafting Committee: PT 61966-13 - TC 100/TA 2/PT 61966-13
• Current Stage: PPUB - Publication issued
• Start Date: 22-Sep-2023
• Completion Date: 01-Nov-2023

Standards Content (Sample)

IEC TS 61966-13 ®
Edition 1.0 2023-11
TECHNICAL
SPECIFICATION
colour
inside
Multimedia systems and equipment – Colour measurement and management –
Part 13: Measurement method of display colour properties depending on
observers
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IEC TS 61966-13 ®
Edition 1.0 2023-11
TECHNICAL
SPECIFICATION
colour
inside
Multimedia systems and equipment – Colour measurement and management –

Part 13: Measurement method of display colour properties depending on

observers
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.60  ISBN 978-2-8322-7450-7

– 2 – IEC TS 61966-13:2023 © IEC 2023
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
3.1 Terms and definitions . 7
3.2 Abbreviations . 8
4 Measuring equipment . 8
4.1 Light-measuring devices . 8
4.2 Viewing direction coordinate system . 9
5 Measuring conditions . 10
5.1 Standard measuring environmental conditions . 10
5.2 Power supply . 10
5.3 Warm-up time . 10
5.4 Standard measuring dark-room conditions . 10
5.5 Standard set-up conditions . 10
6 Measuring methods . 11
6.1 Individual colour-matching functions . 11
6.2 Reference colours . 11
6.3 Observer metamerism index . 12
6.3.1 Purpose . 12
6.3.2 Measuring conditions . 12
6.3.3 Measurement method . 12
7 Reporting form . 20
Annex A (informative) Generating a set of individual CMFs . 21
A.1 Age distribution data . 21
A.2 Example of individual CMFs dataset . 21
Annex B (informative) XYZ values of reference colour . 31
Annex C (informative) Measurement method of observer metamerism between
different displays . 32
C.1 General . 32
C.2 Reference colours and measurement method . 32
Annex D (informative) Colour-matching process for multi-ORU DUTs . 33
Annex E (informative) Working example of observer metamerism index . 35
E.1 Purpose . 35
E.2 DUT . 35
E.3 Process . 35
E.3.1 General . 35
E.3.2 Colour-matching . 36
E.3.3 Calculating the SPD of the DUT . 36
E.3.4 XYZ computation . 36
E.3.5 Colour difference computation . 37
E.3.6 Reporting . 37
Bibliography . 49

Figure 1 – Representation of the viewing direction (equivalent to the direction of
measurement) by the angle of inclination, θ and the angle of rotation (azimuth angle),
φ in a polar coordinate system . 9
Figure 2 – DUT Installation conditions. 11
Figure 3 – Flowchart of the overall evaluation method . 12
Figure 4 – 4 % area centre box patterns of primary colours . 13
Figure 5 – Reporting example of a graph of colour-matched metameric pair of
reference colour and DUT . 20
Figure E.1 – RGB primary spectrum of the DUT . 35
Figure E.2 – Example of graphs of colour-matched metameric pair of reference colour
(Macbeth white) and test colour of the DUT . 38

Table 1 – Reporting form of observer metamerism index . 20
Table A.1 – Example of age distribution data . 21
Table A.2 – Total number of individual CMFs example . 22
Table A.3 – Spectral sensitivity data of the individual CMFs (age group: 22, 27 and 32) . 22
Table A.4 – Spectral sensitivity data of the individual CMFs (Age group: 37, 42 and 47) . 24
Table A.5 – Spectral sensitivity data of the individual CMFs (Age group: 52, 57 and 62) . 26
Table A.6 – Spectral sensitivity data of the individual CMFs (Age group: 67, 72 and 77) . 28
Table B.1 – Reference XYZ values using CIE 1931 standard colorimetric observer . 31
Table E.1 – Optical properties of the DUT . 35
Table E.2 – Reference colour XYZ values of age group 22 individual CMFs . 36
Table E.3 – R, G and B weighting factors of the matched colours (age group 22). 36
Table E.4 – OMI calculation result of all 7 colours and age groups . 37
Table E.5 – Reporting of OMI results . 37
Table E.6 – R, G, B, W spectra of the DUT . 38
Table E.7 – R, G and B weighting factors of the matched colours . 47

– 4 – IEC TS 61966-13:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MULTIMEDIA SYSTEMS AND EQUIPMENT –
COLOUR MEASUREMENT AND MANAGEMENT –

Part 13: Measurement method of display colour
properties depending on observers

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