ISO/IEC TR 29186:2012

Information technology — Office equipment — Test method of colour gamut mapping algorithm for office colour softcopy and hardcopy

ISO/IEC TR 29186:2012 is a supplement to CIE 156:2004, applicable for use in evaluating the colour gamut mapping algorithms of office colour softcopy and hardcopy equipment. ISO/IEC TR 29186:2012 defines test charts, test chart image processing workflow, media, viewing conditions, measurements, colour spaces and experimental methods, suitable for use with office equipment, which either do not exist in CIE 156:2004 or are different from CIE 156:2004. Colour softcopy may be displayed on monitors, incorporating display technologies such as CRT and LCD. Colour hardcopy may be produced by non-impact colour printers, including technologies such as ink jet and electro photography.

Technologies de l'information — Équipement de bureau — Méthode d'essai des algorithmes de mappage des gammes de couleurs pour images à l'écran et copies papier

General Information

• Status: Published
• Publication Date: 12-Jul-2012
• ICS: 37.100.10 - Reproduction equipment
• Technical Committee: ISO/IEC JTC 1/SC 28 - Office equipment
• Drafting Committee: ISO/IEC JTC 1/SC 28/WG 5 - Office Colour
• Current Stage: 9093 - International Standard confirmed
• Completion Date: 21-Sep-2018

Standards Content (Sample)

TECHNICAL ISO/IEC
REPORT TR
29186
First edition
2012-07-15

Information technology — Office
equipment — Test method of colour
gamut mapping algorithm for office
colour softcopy and hardcopy
Technologies de l'information — Équipement de bureau — Méthode
d'essai des algorithmes de mappage des gammes de couleurs pour
images à l'écran et copies papier



Reference number
ISO/IEC TR 29186:2012(E)
©
ISO/IEC 2012

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ISO/IEC TR 29186:2012(E)


This CD-ROM contains:
1) the publication ISO/IEC TR 29186:2012 in portable document format (PDF), which can be viewed
using Adobe® Acrobat® Reader;
2) the test charts from ISO/IEC TR 29186:2012.
Adobe and Acrobat are trademarks of Adobe Systems Incorporated.
IMPORTANT — The electronic file of this document contains colours which are considered to be
useful for the correct understanding of the document. Users should therefore consider printing this
document using a colour printer.


COPYRIGHT PROTECTED DOCUMENT


©  ISO/IEC 2012
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system or transmitted in any form or by any means without prior permission from ISO. Requests for permission to reproduce this product
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Violators may be prosecuted.
Published in Switzerland

ii © ISO/IEC 2012 – All rights reserved

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ISO/IEC TR 29186:2012(E)
Installatio
...

TECHNICAL ISO/IEC
REPORT TR
29186
First edition
2012-07-15


Information technology — Office
equipment — Test method of colour
gamut mapping algorithm for office
colour softcopy and hardcopy
Technologies de l'information — Équipement de bureau — Méthode
d'essai des algorithmes de mappage des gammes de couleurs pour
images à l'écran et copies papier




Reference number
ISO/IEC TR 29186:2012(E)
©
ISO/IEC 2012

---------------------- Page: 1 ----------------------
ISO/IEC TR 29186:2012(E)

COPYRIGHT PROTECTED DOCUMENT


©  ISO/IEC 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56  CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland

ii © ISO/IEC 2012 – All rights reserved

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ISO/IEC TR 29186:2012(E)
Contents Page
Foreword . 4
Introduction . 5
1  Scope . 1
2  Normative references . 1
3  Terms and definitions . 1
4  Requirements . 2
4.1  General . 2
4.2  Reference viewing environments for softcopy and hardcopy. 2
4.3  Test chart Image processing . 4
4.4  Format of test charts . 5
4.5  Experiments . 5
5  Indicating the Use of Test Method of Colour Gamut Mapping Algorithm for Office Colour
Printer . 5
5.1  General . 5
5.2  Preparation of samples . 5
5.3  Presentation of the result . 6
Annex A (informative) Test Chart — Weather . 8
Annex B (informative) Test Chart — OFFICE GAMUT MAPPING . 9
Annex C (informative) Test Chart — False contour chart . 10
Annex D (normative) Test chart Image Processing Workflow . 11
Bibliography . 12

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ISO/IEC TR 29186:2012(E)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are members of
ISO or IEC participate in the development of International Standards through technical committees
established by the respective organization to deal with particular fields of technical activity. ISO and IEC
technical committees collaborate in fields of mutual interest. Other international organizations, governmental
and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information
technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of the joint technical committee is to prepare International Standards. Draft International
Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as
an International Standard requires approval by at least 75 % of the national bodies casting a vote.
In exceptional circumstances, when the joint technical committee has collected data of a different kind from
that which is normally published as an International Standard (“state of the art”, for example), it may decide to
publish a Technical Report. A Technical Report is entirely informative in nature and shall be subject to review
every five years in the same manner as an International Standard.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
ISO/IEC TR 29186 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 28, Office equipment.
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ISO/IEC TR 29186:2012(E)
Introduction
Gamut mapping is a mapping of the colour-space coordinates of the elements of a source image to the colour-
space coordinates of the elements of a reproduction to compensate for differences in the source and
reproduction medium colour gamut capability. A test guideline for evaluating cross-device and cross-media
colour image reproduction gamut mapping algorithms (GMAs), desirable for colour scientists and colour
equipment manufacturers, has already been published as CIE 156:2004. CIE 156:2004 has been applied and
evaluated in various fields. This Technical Report is intended as a supplement to CIE 156:2004 for use with
office colour softcopy and hardcopy equipment.
Members of the colour management study group in JBMIA applied CIE 156:2004 to office colour printers and
found it necessary to specify additional information to ensure consistency in colour gamut mapping algorithm
evaluation. The information required for use with office colour equipment, in addition to CIE 156:2004, pertains
to the output medium, viewing environments, test charts, test chart image processing parameters and
workflow, etc. This experience led to the development of this Technical Report.
CIE 156:2004 specifies general principles to be applied when evaluating colour gamut mapping algorithms of
various colour imaging equipment. In addition to these general principles, equipment-specific detailed
descriptions and exceptions are essential. CIE 156:2004 also specifies colour imaging equipment colour
gamut mapping algorithm evaluation methods pertinent to photography and graphic arts. Specification of
details pertinent to office colour equipment colour gamut mapping algorithm evaluation is desirable.
Without additional information for the office colour equipment application, users of CIE 156:2004 would have
to choose details of the evaluation test method by trial and error and would be unlikely to achieve the same
result as one another. With the use of this Technical Report, users not only save time and effort, but also
obtain test data that is useful for comparison across different test instances. Consistent test methods will
facilitate technological improvements in the area of colour gamut mapping algorithms.
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TECHNICAL REPORT ISO/IEC TR 29186:2012(E)

Information technology — Office equipment — Test method of
colour gamut mapping algorithm for office colour softcopy and
hardcopy
IMPORTANT — The electronic file of this document contains colours which are considered to be
useful for the correct understanding of the document. Users should therefore consider printing
thisdocument using a colour printer.
1 Scope
This Technical Report is a supplement to CIE 156:2004, applicable for use in evaluating the colour gamut
mapping algorithms of office colour softcopy and hardcopy equipment. This Technical Report defines test
charts, test chart image processing workflow, media, viewing conditions, measurements, colour spaces and
experimental methods, suitable for use with office equipment, which either do not exist in CIE 156:2004 or are
different from CIE 156:2004. Colour softcopy may be displayed on monitors, incorporating display
technologies such as CRT and LCD. Colour hardcopy may be produced by non-impact colour printers,
including technologies such as ink jet and electro photography.
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.
CIE 156:2004, Guidelines for the Evaluation of Gamut Mapping Algorithms
ISO 3664:2009, Graphic technology and photography — Viewing conditions
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
gamut mapping
mapping of the colour-space coordinates of the elements of a source image to colour-space
coordinates of the elements of a reproduction to compensate for differences in the source and output medium
colour gamut capability
3.2
colour gamut
dynamic range and colour extent, comprising a volume of colour representation capability
3.3
colour gamut boundary
surface determined by a colour gamut's extremes
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ISO/IEC TR 29186:2012(E)
3.4
gamut boundary descriptor
GBD
overall way of approximately describing a colour gamut boundary
3.5
veiling glare
light, reflected from an imaging medium, that has not been modulated by the means used to produce the
image
NOTE 1 Veiling glare lightens and reduces the contrast of the darker parts of an image.
NOTE 2 In CIE 122, the veiling glare of a CRT display is referred to as ambient flare.
3.6
viewing flare
veiling glare that is observed in a viewing environment but not accounted for in radiometric measurements
made using a prescribed measurement geometry
NOTE The viewing flare is expressed as a percentage of the luminance of adapted white.
3.7
image surround
characteristics of the field surrounding the image being viewed, filling the field of vision
NOTE 1 Adapted from ISO 22028-1.
NOTE 2 The region surrounding the stimulus subtending approximately 10 degrees is called background in
CIE Standard S 017/E:2011 ILV.
4 Requirements
4.1 General
The reproduction intent for the colour reproduction systems in which GMAs will be evaluated in this Technical
Specification is defined to be subjective similarity. This subjective similarity intent is one that aims at
reproducing a given colour image so that the reproduction is as close to the original as possible, with no
image enhancing intent. Furthermore, the similarity is determined psychophysically.
4.2 Reference viewing environments for softcopy and hardcopy
The following reference viewing conditions define the reference viewing environment for subjective accuracy
experiments. They are based on conditions for appraisal of images displayed on colour monitors as specified
in ISO 3664:2009, 4.5 and are based on conditions for practical appraisal of prints as specified in
ISO 3664:2009, 4.3 unless otherwise noted. They are also based on conditions for appraisal of images
displayed on colour monitors and prints as specified in CIE 156:2004, 5.4 (b).
4.2.1 Ambient light source white point
Use an ambient light source white point that approximates CIE standard illuminant D50.
4.2.2 Ambient illuminance on monitor for softcopy evaluation
Use an ambient illuminance on the monitor at the plane of viewing for softcopy evaluation that is less than or
equal to 7/10 of Monitor luminance.
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ISO/IEC TR 29186:2012(E)
Position the source, image being viewed, and observer's eyes to minimize the amount of l
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