SIST EN IEC 63350:2026

Household electric appliances - Specification of the properties of a digital system for measuring the performance (IEC 63350:2026)

IEC 63350:2026 specifies generic requirements for creating a digital system that is used for measuring the characteristics of visually detectable performance, such as browning intensity and lightness.
It defines the metrological requirements of this digital system and demonstrates the procedures for compliance. The digital system contains the measuring instrument, the software, and the reference materials necessary to realize the measurement process.
References to this document can be made by a customer when specifying the digital system and by the suppliers when specifying products offered.
Interested parties can agree to use this document as an input for satisfying measurement management system requirements in any activities.
This first edition cancels and replaces IEC TS 63350, published in 2022.
This edition includes the following significant technical changes with respect to IEC TS 63350:
a) Revision of 4.2: movable items (e.g., containers, jigs, reference objects) can now be present in the assessment area provided that mitigation measures are applied and periodic verification against known reference artefacts is documented; the requirement to keep the assessment area as constant as possible is retained.
b) Addition of new supporting document: Note in 5.1 introduces the Fogra 52 profile (included in the reference colour supporting documents from the IEC SC 59K supporting documents web site) which is referencing the conditions ISO 12647-7 and ISO 12647-2.
c) Four additional reference shades with hue angles > 130° are introduced in 5.3 for calibration (to enable accurate pixel‑wise hue‑angle measurement). These do not create new shade classes.
d) Revision of 6.2: Calculation of sampling positions remains unchanged, but the procedure changes to reflect better the actual test scenario.
e) Added reporting of input image colour channel data (7.7).

Elektrische Geräte für den Hausgebrauch - Spezifikation der Eigenschaften eines digitalen Systems zur Messung der Gebrauchseigenschaften (IEC 63350:2026)

Appareils électrodomestiques - Spécification des propriétés d'un système numérique pour les mesurages d'aptitude à la fonction (IEC 63350:2026)

L'IEC 63350:2026 spécifie des exigences génériques pour la création d'un système numérique utilisé pour mesurer les caractéristiques de performance détectables visuellement, comme l'intensité de brunissement et la luminosité.
Il définit les exigences métrologiques du système numérique et décrit les procédures à suivre pour assurer la conformité de ce système. Le système numérique comprend l'appareil de mesure, le logiciel et les matériaux de référence nécessaires pour conduire le processus de mesure.
Le présent document peut être référencé par le client lors de la spécification du système numérique et par les fournisseurs lors de la spécification des produits proposés.
Les parties intéressées peuvent accepter d'utiliser le présent document comme pour respecter les exigences du système de gestion de la mesure dans l'ensemble de leurs activités.
Cette première édition annule et remplace l'IEC TS 63350 parue en 2022.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'IEC TS 63350:
a) révision du 4.2: des éléments mobiles (par exemple, récipients, supports, objets de référence) peuvent désormais être présents à l'intérieur de la zone d'évaluation à condition de mettre en œuvre des mesures d'atténuation et de documenter une vérification périodique par rapport à des artefacts de référence connus; l'exigence de maintenir la zone d'évaluation aussi constante que possible est conservée;
b) ajout d'un nouveau document de support: la Note en 5.1 introduit le profil Fogra 52 (inclus dans les documents de support sur les couleurs de référence accessibles sur le site web des documents de support du SC 59K de l'IEC) qui fait référence aux conditions de l'ISO 12647-7 et de l'ISO 12647-2;
c) quatre nuances de référence supplémentaires avec des angles de teinte > 130° sont introduites en 5.3 pour l'étalonnage (afin de permettre un mesurage exact des angles de teinte au pixel près). Elles ne créent pas de nouvelles classes de nuances;
d) révision du 6.2: Le calcul des positions d'échantillonnage n'a pas changé, mais la procédure a été modifiée pour mieux refléter le scénario d'essai réel;
e) Ajout de la consignation des données de canaux chromatiques de l'image d'entrée (7.7).

Gospodinjski električni aparati - Specifikacija lastnosti digitalnega sistema za merjenje učinkovitost delovanja (IEC 63350:2026)

IEC 63350:2026 določa splošne zahteve za ustvarjanje digitalnega sistema, ki se uporablja za merjenje značilnosti vizualno zaznavne zmogljivosti, kot sta intenzivnost porjavenja in svetlost.
Opredeljuje metrološke zahteve tega digitalnega sistema in prikazuje postopke za skladnost. Digitalni sistem vsebuje merilni instrument, programsko opremo in referenčne materiale, potrebne za izvedbo merilnega procesa.
Nanašanje na ta dokument lahko izvede stranka pri določanju digitalnega sistema in dobavitelji pri določanju ponujenih izdelkov.
Zainteresirane strani se lahko dogovorijo za uporabo tega dokumenta kot vhod za izpolnjevanje zahtev sistema za upravljanje meritev v katerikoli dejavnosti.
Ta prva izdaja preklicuje in nadomešča IEC TS 63350, objavljen leta 2022.
Ta izdaja vključuje naslednje pomembne tehnične spremembe v primerjavi z IEC TS 63350:
a) Revizija 4.2: premični predmeti (npr. posode, šablone, referenčni objekti) so lahko zdaj prisotni na ocenjevalnem območju, pod pogojem, da se uporabijo omilitveni ukrepi in da je periodična verifikacija glede na znane referenčne artefakte dokumentirana; zahteva, da se ocenjevalno območje ohranja čim bolj konstantno, ostaja.
b) Dodatek novega podpornega dokumenta: Opomba v 5.1 uvaja profil Fogra 52 (vključen v referenčne barvne podporne dokumente s spletnega mesta podpornih dokumentov IEC SC 59K), ki se nanaša na pogoje ISO 12647-7 in ISO 12647-2.
c) V 5.3 so za kalibracijo uvedeni štirje dodatni referenčni odtenki z barvnimi koti > 130° (za omogočanje natančnega merjenja barvnega kota na ravni piksla). Ti ne ustvarjajo novih razredov odtenkov.
d) Revizija 6.2: Izračun vzorčnih položajev ostaja nespremenjen, vendar se postopek spremeni, da bolje odraža dejanski testni scenarij.
e) Dodano poročanje o podatkih barvnih kanalov vhodne slike (7.7).

General Information

• Status: Published
• Public Enquiry End Date: 30-Jul-2025
• Publication Date: 09-Apr-2026
• ICS: 17.180.20 - Colours and measurement of light
• ICS: 97.040.20 - Cooking ranges, working tables, ovens and similar appliances
• Technical Committee: FGA - Consumer information related to household electrical appliances
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 20-Mar-2026
• Due Date: 25-May-2026
• Completion Date: 10-Apr-2026
• Ref Project: EN IEC 63350:2026 - Household electric appliances - Specification of the properties of a digital system for measuring the performance

Overview

kSIST FprEN IEC 63350:2025 is a forthcoming international standard developed by the International Electrotechnical Commission (IEC) and the European Committee for Electrotechnical Standardization (CLC). This standard provides a comprehensive specification for the properties of a digital system used to measure the performance of household electric appliances, particularly focusing on visually detectable characteristics such as browning intensity and lightness.

The digital system includes the measurement instrument, software, and reference materials necessary for accurate and reproducible performance evaluation. It modernizes existing methodologies by integrating standardized color measurement systems like CIELAB, moving away from proprietary color systems, and harmonizing tests primarily related to cooking appliances to ensure greater consistency and reliability.

Key Topics

• Digital measurement systems in household appliances
  Includes physical components (instruments), software algorithms, and reference datasets essential for performance testing.

• Visual performance criteria
  Focuses on measurable effects visible to consumers such as browning intensity, lightness, and color recognition-critical for cooking appliances like ovens and ranges.

• Metrological requirements
  Specifies accuracy, calibration, resolution, and validation procedures to guarantee reliable and reproducible data.

• Test setup and environment
  Details on illumination conditions, measurement environment, and sample preparation are pivotal for standardizing measurements.

• Color reference and shade charts
  Introduction of brown and green shade charts along with CIELAB color values for precise color evaluation.

• Measurement procedures
  Includes steps for verifying evenness, lightness recognition, color recognition, measurement area validation, resolution verification, and projection accuracy.

• Data recording and evaluation
  Specifies the type of raw data to be collected such as LAB and HLC values, color differences (∆E), and dimensional measurements, with methodologies for acceptable tolerances.

• Compliance and certification
  Enables manufacturers and customers to use this standard to specify and validate measurement systems against internationally agreed benchmarks.

Applications

This standard is particularly valuable for:

• Manufacturers of household electric cooking appliances
  Ensuring product performance can be quantitatively assessed using digital measurement systems compliant with recognized standards.

• Testing laboratories
  Providing a benchmark for the development, calibration, and validation of digital systems used in appliance performance testing.

• Quality assurance and control
  Facilitating reproducible and objective evaluation of cooking results such as browning and surface color uniformity.

• Product development
  Allowing engineers to verify performance characteristics against standardized visual criteria during appliance design and testing.

• Regulatory bodies and certification agencies
  Providing a reference framework for performance claims and conformity assessment of household electric appliances.

By adopting kSIST FprEN IEC 63350:2025, stakeholders can achieve greater consistency, transparency, and reliability in measuring visual performance attributes that matter most to end users.

Related Standards

kSIST FprEN IEC 63350:2025 aligns with and builds upon several related international standards, including but not limited to:

• IEC 60350-1 and IEC 60350-2
  Established standards for household electric cooking appliances focusing on measuring performance, which have been updated and integrated within this new specification.

• ISO 10012
  Guidelines on measurement management systems ensuring metrological traceability and process control.

• ISO 12647-7
  Standard related to color management in graphic technology, which informs color measurement methodologies referenced in this standard.

• ISO 15076-1
  Standards for image technology and color management, ensuring consistent color interpretation across digital platforms used for performance assessment.

Together, these standards facilitate the development of robust digital test systems that support objective and internationally recognized evaluation of household appliance performance.

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Keywords: digital performance measurement, household electric appliances, browning intensity, lightness recognition, CIELAB color system, cooking appliance testing, IEC 63350, metrological requirements, appliance performance standards, color shade charts, IEC household appliance standards.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2026
Gospodinjski električni aparati - Specifikacija lastnosti digitalnega sistema za
merjenje učinkovitost delovanja (IEC 63350:2026)
Household electric appliances - Specification of the properties of a digital system for
measuring the performance (IEC 63350:2026)
Elektrische Geräte für den Hausgebrauch - Spezifikation der Eigenschaften eines
digitalen Systems zur Messung der Gebrauchseigenschaften (IEC 63350:2026)
Appareils électrodomestiques - Spécification des propriétés d'un système numérique
pour les mesurages d'aptitude à la fonction (IEC 63350:2026)
Ta slovenski standard je istoveten z: EN IEC 63350:2026
ICS:
17.180.20 Barve in merjenje svetlobe Colours and measurement of
light
97.040.20 Štedilniki, delovni pulti, Cooking ranges, working
pečice in podobni aparati tables, ovens and similar
appliances
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 63350

NORME EUROPÉENNE
EUROPÄISCHE NORM March 2026
ICS 97.040.20
English Version
Household electric appliances - Specification of the properties of
a digital system for measuring the performance
(IEC 63350:2026)
Appareils électrodomestiques - Spécification des propriétés Elektrische Geräte für den Hausgebrauch - Spezifikation
d'un système numérique pour les mesures d'aptitude à la der Eigenschaften eines digitalen Systems zur Messung der
fonction Gebrauchseigenschaften
(IEC 63350:2026) (IEC 63350:2026)
This European Standard was approved by CENELEC on 2026-03-04. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre 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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 63350:2026 E
European foreword
The text of document 59K/429/FDIS, future edition 1 of IEC 63350, prepared by SC 59K "Performance
of household and similar electrical cooking appliances" of IEC/TC 59 "Performance of household and
similar electrical appliances" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 63350:2026.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2027-03-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2029-03-31
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 63350:2026 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60350-1 NOTE Approved as EN IEC 60350-1
IEC 60350-2 NOTE Approved as EN IEC 60350-2
ISO 10012 NOTE Approved as EN ISO 10012
ISO/CIE 11664-4 NOTE Approved as EN ISO/CIE 11664-4
IEC 61966-2-1 NOTE Approved as EN 61966-2-1
ISO/CIE 11664-6 NOTE Approved as EN ISO/CIE 11664-6
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
ISO 12647-2 - Graphic technology - Process control for - -
the production of half-tone colour
separations, proof and production prints -
Part 2: Offset lithographic processes
ISO 12647-7 - Graphic technology - Process control for - -
the production of half-tone colour
separations, proof and production prints -
Part 7: Proofing processes working directly
from digital data
ISO 15076-1 - Image technology colour management - - -
Architecture, profile format and data
structure -- Part 1: Based on ICC.1:2004-
CIE 15 - Colorimetry - -
IEC 63350 ®
Edition 1.0 2026-01
Corrected version
2026-02
INTERNATIONAL
STANDARD
Household electric appliances - Specification of the properties of a digital
system for measuring the performance

ICS 97.040.20  ISBN 978-2-8327-1014-2

IEC 63350:2026-01(en)
IEC 63350:2026 © IEC 2026
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
3.1 Terms and definitions . 6
3.2 Terms and definitions of international lighting vocabulary. 7
4 Test setup . 7
4.1 Illumination . 7
4.2 Measurement environment. 8
5 Determination of shade charts. 8
5.1 Principals of shade creation . 8
5.2 Brown shade charts . 9
5.3 Green shade charts . 10
6 Measurements. 12
6.1 Verification of evenness . 12
6.2 Lightness recognition (L* values) . 12
6.2.1 Description of the test samples . 12
6.2.2 Procedure . 13
6.2.3 Evaluation (requirements and tolerances) . 13
6.3 Colour recognition (L*, a*, b* values) . 13
6.3.1 Description of the test samples . 13
6.3.2 Procedure . 13
6.3.3 Evaluation (requirements and tolerances) . 14
6.4 Verification of the measurement area . 14
6.4.1 General. 14
6.4.2 Description of the test samples . 14
6.4.3 Procedure . 14
6.4.4 Evaluation (requirements and tolerances) . 14
6.5 Verification of the resolution . 14
6.6 Verification of rectilinear projection . 15
6.7 Verification of the 3-dimensional shapes . 15
7 Data to be recorded (raw data) . 16
7.1 Purpose . 16
7.2 LAB . 16
7.3 HLC . 16
7.4 ∆E for the test sample. 16
7.5 Dimensions (in mm) . 16
7.6 Specified measurement areas . 17
7.7 Input image colour channel data . 17
8 Consideration of tolerances . 17
8.1 General . 17
8.2 Calculation of differences in colour and its components . 17
8.3 Distance information . 18

IEC 63350:2026 © IEC 2026
Annex A (normative) Colour-measuring instrument . 19
Annex B (informative) Brown shade charts . 22
Annex C (informative) Green shade charts . 24
Annex D (informative) Evaluation program for determining the deviation in colour
rendering . 26
Annex E (informative) Examples of shade chart positioning for lightness recognition . 27
Bibliography . 28

Figure 1 – Cone shape of colour sample . 15
Figure 2 – 13 sections of the colour sample . 16
Figure A.1 – Colour measuring instrument di:8° . 20
Figure A.2 – Colour measuring instrument 45°:0° . 21
Figure E.1 – Example with an assessment area of 100 mm × 100 mm - 1 position per
row and column . 27
Figure E.2 – Example with an assessment area of 150 mm × 150 mm - 2 positions per
row and column . 27
Figure E.3 – Example with an assessment area of 470 mm × 370 mm - 4 positions per
row and column . 27

Table 1 – Brown shade charts with class limits . 9
Table 2 – Green shade charts . 11
Table 3 – Maximum CIELAB hue angle distance inside different ∆E* ranges . 18
ab
Table A.1 – Colour-measuring instrument specification di:8° . 19
Table A.2 – Colour-measuring instrument specification 45°:0° or 0°:45° . 20
Table B.1 – CIELAB values for the brown shade charts . 22
Table C.1 – CIELAB values for the green shade charts . 24

IEC 63350:2026 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Household electric appliances - Specification of the properties of a digital
system for measuring the performance

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
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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
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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) IEC draws attention to the possibility that the implementation of this document may involve
the use of (a) patent(s). IEC takes no position concerning the evidence, validity or applicability
of any claimed patent rights in respect thereof. As of the date of publication of this document,
IEC had not received notice of (a) patent(s), which may be required to implement this document.
However, implementers are cautioned that this may not represent the latest information, which
may be obtained from the patent database available at https://patents.iec.ch. IEC shall not be
held responsible for identifying any or all such patent rights.
IEC 63350:2026 © IEC 2026
IEC 63350 has been prepared by subcommittee SC 59K: Performance of household and similar
electrical cooking appliances, of IEC technical committee TC 59: Performance of household
and similar electrical appliances.
This first edition cancels and replaces IEC TS 63350, published in 2022.
This edition includes the following significant technical changes with respect to IEC TS 63350:
a) Revision of 4.2: Movable items (e.g., containers, jigs, reference objects) can now be present
in the assessment area provided that mitigation measures are applied and periodic
verification against known reference artefacts is documented; the requirement to keep the
assessment area as constant as possible is retained.
b) Addition of new supporting document: Note in 5.1 introduces the Fogra 52 profile (included
in the reference colour supporting documents from the IEC SC 59K supporting documents
web site) which is referencing the conditions of ISO 12647-7 [1] and ISO 12647-2 [2].
c) Four additional reference shades with hue angles > 130° are introduced in 5.3 for calibration
(to enable accurate pixel‑wise hue‑angle measurement). These do not create new shade
classes.
d) Revision of  6.2: Calculation of sampling positions remains unchanged, but the procedure
changes to reflect better the actual test scenario.
e) Added reporting of input image colour channel data (7.7).
The text of this document is based on the following documents:
Draft Report on voting
59K/429/FDIS 59K/431/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this document is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at https://www.iec.ch/members_experts/refdocs. The main document types developed by IEC
are described in greater detail at https://www.iec.ch/standardsdev/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
This corrected version of IEC 63350:2026 incorporates the following correction:
– Addition of bibliographic reference numbers in the content
IEC 63350:2026 © IEC 2026
INTRODUCTION
IEC subcommittee 59K has agreed to make a collection of existing and future requirements on
a digital system used in testing the performance of appliances under the scope of SC 59K,
cooking appliances.
This document bundles the generic requirements given in IEC 60350-1 [3] and IEC 60350-2 [4]
that are updated, aligned, and supplemented by further requirements. The reference colour
system is changed from a proprietary colour system to the standardized and widely used
CIELAB-based reference colour system.
The intention with this publication is to ensure that using a digital system, which complies with
the stated requirements and described methods, leads to reproducible results.
Currently, this document focuses on test methods described in IEC 60350-1 [3] and IEC 60350-2
[4] but further applications based on visually detectable performance criteria can be
supplemented.
IEC 63350:2026 © IEC 2026
1 Scope
This document specifies generic requirements for creating a digital system that is used for
measuring the characteristics of visually detectable performance, such as browning intensity
and lightness.
It defines the metrological requirements of this digital system and demonstrates the procedures
for compliance. The digital system contains the measuring instrument, the software, and the
reference materials necessary to realize the measurement process.
References to this document can be made by a customer when specifying the digital system
and by the suppliers when specifying products offered.
Interested parties can agree to use this document as an input for satisfying measurement
management system requirements in any activities.
NOTE 1 The principles of ISO 10012 [5] are followed to ensure the capability of the systems.
NOTE 2 Possible suppliers for the recommended digital system can be found in the supplementary file located at:
https://www.iec.ch/sc59k/supportingdocuments.
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.
ISO 12647-2, Graphic technology — Process control for the production of half-tone colour
separations, proof and production prints — Part 2: Offset lithographic processes
ISO 12647-7, Graphic technology - Process control for the production of half-tone colour
separations, proof and production prints - Part 7: Proofing processes working directly from
digital data
ISO 15076-1, Image technology colour management - Architecture, profile format and data
structure - Part 1: Based on ICC.1:2010
CIE 15, Colorimetry
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
3.1 Terms and definitions
3.1.1
digital system
system that is used for measuring the characteristics of visually detectable performance
IEC 63350:2026 © IEC 2026
3.1.2
assessment area
area of the digital system within which the requirements stated in this document are met and
the items under test are positioned
3.1.3
shade chart
sample representing the reference values for the colour and lightness recognition and used for
calibration of the digital system
3.1.4
items under test
IUT
objects positioned in the assessment area for evaluation
EXAMPLE 1 Shortbread, small cakes, broccoli, white bread, in accordance with IEC 60350-1 [3].
EXAMPLE 2 Floured disc, in accordance with IEC 60350-2 [4].
3.2 Terms and definitions of international lighting vocabulary
L* CIELAB lightness
a*, b* CIELAB a*, b* coordinates
C* CIELAB chroma
ab
h CIELAB hue angle
ab
∆L* CIELAB lightness difference
∆E* CIELAB colour difference
ab
∆E CIEDE2000 colour difference
4 Test setup
4.1 Illumination
The measurement is taken under an illumination similar to the CIE Standard Illuminate used for
the definition of the shade charts (see Clause 5).
The maximum calculated deviation of rendering the shade charts under the used light shall be
∆L* ≤ 1 for a measurement system for lightness recognition, and ∆E ≤ 5 for a measurement
system for colour recognition.
To calculate the deviation of the colour rendering, the 10° tristimulus values of the reference
colours shall be calculated with the spectral distribution of the reference colours defined in the
corresponding performance test for the relative spectral power distribution of CIE D65 and the
relative spectral power distribution of the test setup illumination. The calculation shall be
performed from 400 nm to 700 nm with a step of increment no more than 10 nm.
The spectral power distribution of the test setup illumination shall be measured along the central
axis of the beam, with the sensing surface oriented normal to this axis. The spectroradiometer
sensing surface is placed at a distance which ensures sufficient light for a measurement to be
taken while eliminating any stray light. The light shall stabilize before measurements are carried
out (e.g. stable temperature).
Spectral distribution of the reference colours for the calculation shall be acquired with a diffuse
eight-degree geometry, specular component included measurement mode (di:8°) spectrometer
in accordance with CIE 15.
IEC 63350:2026 © IEC 2026
NOTE 1 Necessary information on calculating the tristimulus, spectral distribution of D65, L*, a*, b* and ∆E can
be found in ISO 11664 (all parts) [6].
An Excel evaluation program, which corresponds to the described method, is available as an
example for the automatic calculation of the deviation of the colour rendering for measured light
spectra from at least 400 nm to 700 nm with a step of increment 10 nm; see Annex D. This
document includes the light spectra of the proposed reference colours of this document and the
light spectra of the CRI calculation colours in accordance with CIE 15.
NOTE 2 The supplementary file for the described method is located at:
https://www.iec.ch/sc59k/supportingdocuments
4.2 Measurement environment
During measurements, movable items other than the IUT, such as containers, reference objects,
jigs, and other similar items, can be present near or inside the assessment area, provided that
measures are implemented to mitigate their effect on the object under test and ensure that the
measurement results remain within the specified tolerances.
EXAMPLE For example by placing known reference objects (e.g. shade charts) within the assessment area, in the
presence of these non-IUT items, and performing measurements using the same setup. The measured values of
these reference objects are compared to their known values to confirm that the deviation remains within the specified
tolerances. This verification is documented and repeated at intervals to ensure ongoing compliance with the tolerance
requirements.
The assessment area shall be kept as constant as possible since every item can alter the
illumination by absorption or reflection.
5 Determination of shade charts
5.1 Principals of shade creation
Shade charts represent the reference values for the colour and lightness recognition. Since the
recognition is based on classes, the shade chart shall represent the centre point of each class.
For recognition based on 1-dimensional classes (e.g. L*), the values of the defined reference
colour shall be in the centre of the boundaries of each class. This is achieved by mathematically
creating the reference colours along a line in the 3-dimensional CIELAB colour space.
For recognition based on multiple dimensions within the CIELAB colour space, the defined
reference colours shall be located with equal distances within a space defined by at least 3
coordinates. The equal distancing between the defined colours shall be based on at least two
values of the CIELAB system (ISO/CIE 11664-4 [7]). This results in a colour gradient with a
linear step size in at least 2 dimensions.
Defined colours shall be printed in accordance with the proof process described in ISO 12647-
7 on matt proofing paper simulating PS5 (print substrate 5 in accordance with ISO 12647-2) as
spot colours. The printed colour samples shall be calibrated with a diffuse eight-degree
geometry, specular component included measurement mode (di:8°) spectrometer in accordance
with CIE 15 and shall be in a range of ∆L* ≤ 1,5 if used as reference colours for the lightness
recognition and ∆E ≤ 5 if used as reference colours for the colour recognition.
___________
Excel is the trade name of a product supplied by Microsoft Corporation. This information is given for the
convenience of users of this document and does not constitute an endorsement by IEC of the product named.
Equivalent products may be used if they can be shown to lead to the same results.
IEC 63350:2026 © IEC 2026
Proof process defined in ISO 12647-7 is referring to spectral measurement defined in ISO 13655
[8] which is (45°:0°) or (0°:45°) geometry and D50 reference illumination. Requirements for
colour measuring instruments in accordance with CIE 15 for (di:8°) and (45°:0°) or (0°:45°)
geometry are stated in Annex A. For proper colour communication, conversion of the colour
information to a reference colour space described in ISO 15076-1 is necessary. Converted
values and the applied conversion models for the exemplary shade charts shown in this
document can be found in Annex B and Annex C.
Created shade charts shall be within the limits of the sRGB colour space.
NOTE 1 Necessary information on transforming the CIEXYZ colour space to sRGB can be found in IEC 61966-2-1
[9] and transforming the CIELAB colour space to the CIEXYZ colour space can be found in ISO/CIE 11664-4 [7].
NOTE 2 Provided shade documents in the supporting documents contain the Fogra 52 profile,
https://www.iec.ch/sc59k/supportingdocuments. This profile includes the required conditions outlined in ISO 12647-
7 [1] and ISO 12647-2 [2].
NOTE 3 For visual assessment of defined colours, the contract proof requirements of ISO 12647-7 [1] for spot
colours are sufficient to
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