ANSI INCITS ISO IEC 19799-2007 Information technology Method of measuring gloss uniformity on printed pages.pdf

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1、INCITS/ISO/IEC 19799:20072008 (ISO/IEC 19799:2007, IDT) Information technology Method of measuring glossuniformity on printed pagesINCITS/ISO/IEC 19799:20072008(ISO/IEC 19799:2007, IDT)INCITS/ISO/IEC 19799:20072008 ii ITIC 2008 All rights reserved PDF disclaimer This PDF file may contain embedded ty

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3、ringing Adobes 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 op

4、timized 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. Adopted by INCITS (InterNational Committee for Information

5、 Technology Standards) as an American National Standard. Date of ANSI Approval: 6/18/2008 Published by American National Standards Institute, 25 West 43rd Street, New York, New York 10036 Copyright 2008 by Information Technology Industry Council (ITI). All rights reserved. These materials are subjec

6、t to copyright claims of International Standardization Organization (ISO), International Electrotechnical Commission (IEC), American National Standards Institute (ANSI), and Information Technology Industry Council (ITI). Not for resale. No part of this publication may be reproduced in any form, incl

7、uding an electronic retrieval system, without the prior written permission of ITI. All requests pertaining to this standard should be submitted to ITI, 1250 Eye Street NW, Washington, DC 20005. Printed in the United States of America iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normativ

8、e 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 Proce

9、dure 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 ch

10、arts 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 estim

11、ates) 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 INCITS/ISO/IEC 19799:20072008 ITIC 2008 All rights reservediv Foreword ISO (the International Organ

12、ization 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 establish

13、ed 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.

14、 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. Pu

15、blication 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 paten

16、t rights. ISO/IEC 19799 was prepared by Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 28, Office equipment. INCITS/ISO/IEC 19799:20072008 ITIC 2008 All rights reservedvIntroduction The purpose of this International Standard is to provide a process for measuring objective

17、 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 analysi

18、s 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 describi

19、ng the gloss uniformity of printing and copying systems in documentation supplied to the consumer by the manufacturer. INCITS/ISO/IEC 19799:20072008 ITIC 2008 All rights reservedAMERICAN NATIONAL STANDARD INCITS/ISO/IEC 19799:200720081Information technology Method of measuring gloss uniformity on pr

20、inted 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 result

21、s 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

22、 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 an

23、d 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 subjec

24、tive 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

25、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

26、. 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

27、attributes (such as gloss grain, gloss spot, gloss streak, gloss band, gloss mottle/cloud, gloss moir) 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 availa

28、ble, 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

29、 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 ITIC 2008 A

30、ll rights reserved2 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

31、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 m

32、easurement 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. Col

33、orant 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

34、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 (f

35、lat-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,

36、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 betw

37、een 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 con

38、tent. 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 it

39、ems as gloss grain, gloss spot, gloss streak, gloss band, gloss mottle/cloud and gloss moir 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 objective measurement equipment for these gloss arte

40、facts, an instrumented measurement procedure cannot be recommended at present. As instrumented measurement capability becomes available, this will be considered for adoption into this International Standard. 3.7 mean gloss attribute that quantifies the overall level of glossiness of the print NOTE T

41、he mean gloss value is calculated from the gloss values for the 40 individual printed patches (see the test chart in Annex A) on the print under test. The mean gloss value of the 40 patches is considered to be the mean gloss of the print. Mean gloss, for the purposes of ISO 19799, refers only to the

42、 mean gloss of the test chart provided in Annex A. The mean gloss, which is image content dependent, will not necessarily be the same for other images. INCITS/ISO/IEC 19799:20072008 ITIC 2008 All rights reserved34 Test Parameters and Conditions 4.1 Set-up Place the copier or printer on a horizontal

43、surface and set-up the copier/printer according to the installation guide provided in the users manual. Use the most recent copier/printer driver available from the manufacturer. The driver version will be specified on the test report. All image and print quality modifiers should be at their factory

44、 pre-set configuration for the copier/printer and default installed condition for the driver. If the printer/copier and driver differ, then the driver defaults should be used. Deviation from the above conditions should be noted in the test report. For the printer, to assure that the test page is ren

45、dered correctly, no page size modifiers such as “Fit to Page” should be used and font substitution should be turned off. The file should be printed using the fonts embedded in the file and should be rendered on the page in a size corresponding to the dimensions in the test page description. Page pla

46、cement modifiers such as page centering can be used to place the image properly on the page. The test(s) shall be performed in the following environment. Temperature: 18 C to 25 C Relative humidity 30 % to 70 % 4.2 Sample Size For the differential gloss and gloss uniformity within-page tests, only o

47、ne set of representative test prints (for printer) or copies (for copier) is required. For the gloss consistency within a run test, ten sets of test prints are needed (the test set can have multiple pages). 4.3 Print Mode For reporting gloss uniformity, the test shall be run after the engine has war

48、med up in ready mode. The engine settings (simplex mode, duplex mode, paper selection, fuser setting, print speed, quality setting etc) of the Printer/copier should be noted in the report. 4.4 Paper The paper used in this test should represent a compatible paper for the engine, and must conform to t

49、he manufacturers list of approved papers unless otherwise noted in the report. The paper manufacturer, weight, coated/uncoated, paper gloss and size, A4 or equivalent, used in the test will be noted on the report. 4.5 Maintenance Print engine maintenance shall be performed per the users manual. 4.6 Original test charts for copiers This standard addresses the gloss uniformity of reflection prints regardless of whether the print comes from a printer or a copier. Therefore, both an electronic tes