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ISO/IEC 19799:2007

(Main)

Information technology — Method of measuring gloss uniformity on printed pages

Information technology — Method of measuring gloss uniformity on printed pages

ISO/IEC 19799:2007 defines methods and processes for measuring objective print quality attributes for the assessment of gloss non-uniformity on printed pages in reflection mode, and provides transforms, when applicable, that relate the objective results to subjective responses if appropriate. The gloss uniformity attributes included in ISO/IEC 19799:2007 are differential gloss, gloss uniformity within a page, and gloss consistency within a run. ISO/IEC 19799:2007 provides a definition of gloss uniformity attributes representative of the print quality on reflection prints, a set of print files for the creation of printed pages for gloss uniformity measurement, a procedure for gloss uniformity testing and the analysis of the resulting data, a method for evaluating and grading these measurements and deriving an assessment of gloss uniformity, the appropriate method of describing the gloss uniformity of printing and copying systems in documentation supplied to the consumer by the manufacturer. The reflection prints that are to be used for measurement can be created via printers or copiers (analog and digital). ISO/IEC 19799:2007 is applicable only to electro-photographic based prints. It does not address the measurement of gloss attributes of printed pages in transmission mode.

Technologies de l'information — Méthode de mesure de l'uniformité de lustre des pages imprimées

General Information

Status
Published
Publication Date
12-Mar-2007
ICS
37.100.10 - Reproduction equipment
Technical Committee
ISO/IEC JTC 1/SC 28 - Office equipment
Drafting Committee
ISO/IEC JTC 1/SC 28 - Office equipment
Current Stage
9093 - International Standard confirmed
Start Date
08-Dec-2023
Completion Date
19-Apr-2025
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INTERNATIONAL ISO/IEC
STANDARD 19799
First edition
2007-03-15
Information technology — Method of
measuring gloss uniformity on printed
pages
Technologies de l'information — Méthode de mesure de l'uniformité de
lustre des pages imprimées
Reference number
©
ISO/IEC 2007
PDF disclaimer
PDF files may contain embedded typefaces. In accordance with Adobe's licensing policy, such files may be printed or viewed but shall
not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading a PDF file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create the PDF file(s) constituting this document can be found in the General Info relative to
the file(s); the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the files are suitable for
use by ISO member bodies. In the unlikely event that a problem relating to them is found, please inform the Central Secretariat at the
address given below.
This CD-ROM contains:
1) the publication ISO/IEC 19799:2007 in portable document format (PDF), which can be viewed using
Adobe® Acrobat® Reader; and
2) electronic attachments containing colour print samples.
Adobe and Acrobat are trademarks of Adobe Systems Incorporated.
©  ISO/IEC 2007
All rights reserved. Unless otherwise specified, no part of this CD-ROM may be reproduced, stored in a retrieval system or transmitted in
any form or by any means without prior permission from ISO. Requests for permission to reproduce this product should be addressed to
ISO copyright office • Case postale 56 • CH-1211 Geneva 20 • Switzerland
Internet
...


INTERNATIONAL ISO/IEC
STANDARD 19799
First edition
2007-03-15
Information technology — Method of
measuring gloss uniformity on printed
pages
Technologies de l'information — Méthode de mesure de l'uniformité de
lustre des pages imprimées
Reference number
©
ISO/IEC 2007
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

©  ISO/IEC 2007
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 copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO/IEC 2007 – All rights reserved

Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 Test Parameters and Conditions. 3
4.1 Set-up. 3
4.2 Sample Size . 3
4.3 Print Mode . 3
4.4 Paper . 3
4.5 Maintenance . 3
4.6 Original test charts for copiers . 3
4.7 Print Files. 4
5 Test Methodology . 4
5.1 Testing Procedure for copiers. 4
5.2 Testing Procedure for printers . 5
6 Determination of the gloss uniformity for printed pages . 5
6.1 Determination of differential gloss . 5
6.2 Determination of gloss uniformity within-page . 6
6.3 Determination of gloss consistency within a run. 7
7 Test report . 7
Annex A (informative) Differential gloss test charts and color values . 8
Annex B (informative) Examples of differential gloss measurement results using different paper
substrates on copiers and printers. 13
Annex C (informative) Differential gloss perceptual scale. 15
Annex D (informative) Differential threshold for visual gloss curve (JND estimates) . 18
Annex E (informative) Gloss uniformity test charts, color values and result examples . 19
Annex F (informative) G60 and G75 differential gloss round-robin experiment data . 26
Bibliography . 28
© ISO/IEC 2007 – All rights reserved iii

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
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO/IEC 19799 was prepared by Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee
SC 28, Office equipment.
iv © ISO/IEC 2007 – All rights reserved

Introduction
The purpose of this International Standard is to provide a process for measuring objective print quality
attributes for gloss non-uniformity on printed pages in reflection mode.
This International Standard prescribes the following:
⎯ a definition of gloss uniformity attributes representative of the print quality on reflection prints;
⎯ a procedure for gloss uniformity testing and the analysis of the resulting data;
⎯ a method for evaluating and grading these measurements and deriving an assessment of gloss uniformity,
enabling a means to correlate the objective gloss uniformity measurement to subjective impression of
gloss uniformity if appropriate; and
⎯ the appropriate method of describing the gloss uniformity of printing and copying systems in
documentation supplied to the consumer by the manufacturer.

© ISO/IEC 2007 – All rights reserved v

INTERNATIONAL STANDARD ISO/IEC 19799:2007(E)

Information technology — Method of measuring gloss
uniformity on printed pages
1 Scope
The scope of this International Standard is to define methods and processes of measuring objective print-
quality attributes for the assessment of gloss non-uniformity on printed pages in reflection mode, and to
provide transforms, when applicable, that relate the objective results to subjective responses, if appropriate.
There are many existing standards (see Normative references and Bibliography for details) typically used for
gloss measurement. Our intent is to leverage the existing standards and adapt those for use on gloss
uniformity measurements where appropriate.
This International Standard is composed of a standardized test methodology, which is based on established
gloss measurement methodologies as noted in Clause 2 and in the Bibliography. The methodologies have
been modified so that, when applied to printed pages created by different marking technologies and imaging
algorithms on different substrates, the results indicate the level of the objective gloss uniformity of the printed
pages (in reflection mode). If the objective measurement can be linked to the subjective impression of gloss
uniformity, then the linkage from objective measurement to subjective impression via mathematical transforms
is provided. The reflection prints that are to be used as the subject of these tests can be created via printers or
copiers (analog and digital). This International Standard should be applied only to electro-photographic bases
prints. When more reflection prints made by other printing technologies become available for follow-up study,
one may consider including those printing technologies in this International Standard as a revision. This
International Standard does not address the measurement of gloss attributes of printed pages in transmission
mode.
Gloss uniformity attributes currently included in this International Standard are: differential gloss, gloss
uniformity within a page, and gloss consistency within a run. Due to the current level of immaturity of
commercially available objective micro-gloss measurement instruments, gloss artefact attributes (such as
gloss grain, gloss spot, gloss streak, gloss band, gloss mottle/cloud, gloss moiré) are not included in this
International Standard at the present time, since instrumented measurement procedure cannot be
recommended at present. As instrumented measurement capability becomes available, they will be
considered for adoption into this International Standard as a revision.
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.
ISO 2813, Paints and varnishes — Determination of specular gloss of non-metallic paint films at 20°, 60° and
85°
ISO 8254-1:1999, Paper and board — Measurement of specular gloss — Part 1: 75° gloss with a converging
beam, TAPPI method
© ISO/IEC 2007 – All rights reserved 1

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
gloss value
pertains to front surface reflection of incident light from an image or non-image area that varies with angle
relative to the normal-to-the-receiver surface
NOTE Images whose front surface exhibits a highly specular reflection are considered to be high gloss while those
whose front surface exhibits more of a lambertian (matte) reflection characteristic are considered to be low gloss. Gloss
values can differ depending on the measurement methodology (such as measurement angle of gloss instruments and the
size of the sampled area) and the magnitude of gloss level in the area of interest.
3.2
differential gloss
spread of the gloss readings on a single test target
NOTE Differential gloss, when present, is an image content and substrate dependent effect. Colorant area coverage
ranging from 0 % to high area coverage must be considered as that coverage difference which is commonly observed in
typical images. The effective range of minimum and maximum gloss can vary dependent upon substrate gloss. Thus, an
image with variable spatial colorant laydown can exhibit variation in gloss level, and this variation may be large enough to
be observed and considered to be objectionable. Differential gloss, in this context, is most easily quantified when
observing adjacent flat-field image regions of different content (density, colour, etc.).
3.3
within page (flat-field) gloss variability
attribute that often takes the form of a large-scale gloss gradient (gloss value change), or fade, from one side
of the image (at the same colorant laydown) to the other or from top to bottom of the image
NOTE This is generally evaluated within large flat field regions, since the same level of colorant laydown is needed
over the entire region to correctly quantify this type of gloss variability.
3.4
page-to-page (flat-field) gloss variability
variability in the gloss value of the document from page to page (one-sided printing as well as two-sided
printing), or between adjacent pages (of the same image contents)
NOTE This gloss value variation can be accompanied by any of the other gloss categories defined here, such as
within page gloss variability or sundry gloss artefacts, and can probably only be meaningfully evaluated between pages
with the same image content. The magnitude of this attribute can be deduced from the measurement of gloss consistency
within a run.
3.5
gloss consistency within a run
gloss variation (flat-field) of the same colorant coverage on a similar substrate within a print run of a
pre-defined run length
3.6
gloss artefacts
such items as gloss grain, gloss spot, gloss streak, gloss band, gloss mottle/cloud and gloss moiré
NOTE More detailed descriptions of these artifacts can be found in the Normative references and the Bibliography.
Due to the current level of immaturity of obje
...

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