ISO/TS 20498-3:2020

TECHNICAL ISO/TS
SPECIFICATION 20498-3
First edition
2020-04
Traditional Chinese medicine —
Computerized tongue image analysis
system —
Part 3:
Colour chart
Médecine traditionnelle chinoise — Système d’analyse d’images
numérisées de la langue —
Partie 3: Nuancier
Reference number
ISO/TS 20498-3:2020(E)
©
ISO 2020

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ISO/TS 20498-3:2020(E)

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ii © ISO 2020 – All rights reserved

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ISO/TS 20498-3:2020(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification . 2
4.1 Colour chart without registration mark . 2
4.2 Colour chart with registration mark . 2
5 Technical requirements . 3
5.1 Accuracy of L*a*b* value . 3
5.2 Colour patch size and margin . 4
5.3 Optical transparency . 5
5.4 Usage of colour chart . 5
5.5 Printing condition . 5
Annex A (informative) Characteristics of each colour patch and the usage of the colour chart .6
Annex B (informative) sRGB values of colour chart . 7
Annex C (informative) Printing condition of each colour patch. 8
Bibliography . 9
© ISO 2020 – All rights reserved iii

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ISO/TS 20498-3:2020(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been
...