Ehs1302 annex vi lanat d65 vs d50 20131025

| © The Paperdam Group1 Luc LANAT ERA EHS-Paper Munich

D 50 and D 65 why and when ?

Luc LAN

2013 10 24

| © The Paperdam Group

Summary

� What is Paperdam ?

� Illuminants D50 and D65

� Related equipments

� Need of calibration

� In practice, when to use what?

� ISO 15397 as a reminder

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Paperdam Foundation contributors2013

Contributors from 7 paper companies:1. Hans-J. DRENK Norske Skog2. Jouni MARTTILA SAPPI3. Jozie DAHLMANS SAPPI4. Peter PETERMANN Stora Enso5. Carsten BOCKMANN UPM6. Thomas HERBST Leipa7. Joan FONT Lecta8. Jan ANDERSSON Holmen

Stakeholders and Honorary :1. Wilco de GROOT IGT, Convenor TC6-TC 130 JWG 392. Luc LANAT Convenor and Chairman of Paperdam Foundation, past ATIP President

Follow our work :� Daniel HAWKRIGG Iggesund (Holmen)� Frank WERTHSCHULTE Stora Enso� Wang Junjiang UPM China� Arjo-Wiggins, Clairefontaine, Emin-Leydier, Pap. Vosges, CTP Grenoble (thru ATIP)

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Paperdam Scope

� The objects of the foundation "Paperdam" are to contribute to the role of paper as a productwithin international standardisation in the graphic technology.

� Paperdam acts as per ISO Global Relevance Policy. Paperdam can organize and sponsor exhibitions, conferences, studies or other activities.

� The following subjects shall not be discussed during any meetings or contacts on behalf of Paperdam:

1. Sales and purchase prices, including price changes or pricing policy.

2. Discounts, rebates, allowances or other factors affecting sales or purchase prices.

3. The commercial terms or conditions of sale or purchase.

4. Production output, capacity, capacity utilization rates or changes in output, capacity or capacity utilization rates.

5. Individualized sales/order figures or customer lists.

6. Production, marketing, Research and development or other costs.

7. Investments, production, product development or marketing polices or plans.

8. Research and development plans or results.

9. Stock levels.

10. Allocation of customers.

11. Sales territories.

12. Market sharing.

13. Sharing of sources of supply.


| © The Paperdam GroupSept

2,

2008

FAN 2009 Whiteness Status5

Optical standards paper and printers.

� TC 6 standards series were developped to fulfill needs of papermaking industry to supply the top white grades. To evaluate and produce consistently these papers you need :

– illuminant D 65 with the daylight UV content.

– equipment d/0°.

� Indoor viewing conditions refer to illuminant C.

� TC 130 standards series is based on :

– printer illuminant D 50.

– equipment 45°/0° or 0°/45°.

| © The Paperdam GroupSept

2,

2008

FAN 2009 Whiteness Status6

Illuminants definitions� D 50 « indoor illumination »

– horizon light, warm daylight at sunrise or sunset (5000°°°°K)

� D 65 « outdoor daylight »– noon overcast daylight (6500°°°°K)

� C « indoor daylight »– average or north sky daylight (6770°°°°K)

� D 75 overcast nordic daylight (7500°°°°K)

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Wavelength, nm

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Calculations

� Paper

– Measure diffuse reflectance factor with equipments in conformance with ISO 2469.

– Calculate ISO Brightness, D65 Brightness, CIE Whiteness

indoor, CIE Whiteness oudoor, CIELAB colour in D50/2°observer or C/2° observer or D65/10° observer illumination conditions with Xenon light source.

� Printing

– Measure spectral reflectance factor in conformance with ISO 13655, which includes calculations of CIELAB in D50 with M0 (illuminant A), M1 (illuminant D50), M2 (illuminant D50 UVex) or M3 (polarized) conditions with incandescent light source.

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| © The Paperdam Group8 2013 10 24Luc LANAT ERA EHS-Paper Munich

| © The Paperdam Group2013

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Luc LANAT ERA EHS-Paper Munich10


Relative spectral power distribution of standard CIE illuminants versus

wavelenth in nm (nanometers). Source CIE 15:2004.

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Standard Illuminant A Standard Illuminant D65

Illuminant C Illuminant D50

Illuminant D55 Illuminant D75

Illuminant ID 65 CIE 184-2009


| © The Paperdam Group2013

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Daylight D50 and Viewing Booths

Coppel et al. 2006

D65D65

Fluorescent D50 tubes (5000 K) are quite far from ““““true”””” D50


When to use what ?

� Colour Management is a printing issue and is D50 world.

– Colour calculations and references should thus refer to it.

– Papermakers willing to fullfill ISO 15397 will provide CIELAB coordinates in D50 to set up the white point of colourmanagement files.

� Visual evaulation of paper depends of the environment.

– In office and houses, C illumination is closest.

– ISO Brightness or D65 Brightness, depending of paper marketsis quite suited to evaluate unprinted « white » paper.

– Whiteness is most complete concept to fine-tune ranking of unprinted papers.



Specifics for Gravure papers

� Targets of bvdm are to-day a well accepted references for catalogues, magazines, SC and LWC.

– These targets refer to CIELAB in D65. They are best suited to evaluate a target and a paper specification.

– The acceptable deviation around these targets are quitedemanding and FAR BELOW usual deviations in printing industry.

– Targets are targets and should not be used for:

– Colour management (because based on D50)

– Visual evaluation of blank paper because whiteness and/or

brightness is developed and meant for this concept.

� bvdm Roto specification is excellent reference to develop colourmanagement profiles.



Graphic Technology — Communication of graphic paper properties

Technologie graphique — Communication des propriétés des papiers graphiques

INTERNATIONAL STANDARD

ISO/FDIS15397

FINALDRAFT

ISO/TC 130

Secretariat: SAC

Voting begins on: 2013-08-29

Voting terminates on: 2013-10-29


ISO FDIS 15397 Intro for info



FDIS 15397 Scope

1 Scope

This International Standard specifies the list of paper substrate relevant properties to be communicated between the paper and the printing industries.

This International Standard is applicable to papers intended to be printed in rotogravure, cold-set web offset, heat-set web offset, sheet-fed offset, and flexographic printing processes and to proofing substrates.

Where multiple measures exist the preferred procedure and its International Standard is defined.

All measuring methods of properties specified in this International Standard are described in ISO Standards.


4 List of required criteria for communication of paper properties

For rotogravure, cold-set offset, heat-set web offset, sheet-fed offset, flexographic and proofing printing substrates, the intended use or printing process shall be identified and the following properties shall be communicated by the paper manufacturer, with target values.

a) Brand name and optionally paper mill (as per Clause 5.1)

b) Grammage (as per Clause 5.2)

c) Bulk and/or Thickness (as per Clause 5.3)

d) Roughness PPS (Parker-Print Surf) or Roughness Bendtsen or Smoothness Bekk (as per Clause 5.4)

For Rotogravure substrates, only Roughness PPS is meaningful, values being usually below 3. When Roughness PPS values are above 3, the use of Roughness Bendtsen is recommended. When Roughness Bendtsen is below 100, Smoothness Bekk may be used, in particular in smooth writing papers.

e) Gloss value and for proofing substrates characterization according to ISO 12647-7 (“glossy”, “semi-matte” or “matte”) (as per Clause 5.5)

The gloss level and the equipment used will determine the International Standard to be used. The International Standard shall therefore be cited when communicating gloss values.

NOTE 1 ISO 12647-7 characterizes proofing substrates measured according to ISO 8254-1 as “glossy” for values larger or equal to 60, as “matte” for values smaller or equal to 20 and “semi matte” in between.

f) Opacity (as per Clause 5.6)



g) Brightness and/or Whiteness for visual appearance evaluation of unprinted paper (as per Clause 5.7)

Whiteness is recommended, but Brightness will bring useful information. This choice will determine the International Standard to be used. The International Standard used shall therefore be cited when communicating Whiteness and Brightness values.

NOTE 2 Brightness and Whiteness standards are available either for C illuminant or D65 illuminant. The choice of the illuminant depends of the end-user viewing conditions.

h) Colour coordinates L*, a*, b* with D50 illuminant and CIE 1931 Standard Colorimetric Observer [9] for paper white point in printing conditions (as per Clause 5.8)

i) Colour coordinates L*, a*, b* with D65 illuminant and CIE 1964 Standard Colorimetric Observer for unprinted paper in outdoor conditions (as per Clause 5.9)

j) Printing Characterization Data recommendations (as per Clause 5.10)

k) Fluorescence or fluorescence estimate in the context of prepress colour management deviations. (as per Clause 5.11)

NOTE 3 To avoid distortions due to Fluorescence and for the purpose of proof to print match, proofing substrates and

production papers require to be visually evaluated and measured each with the same amount of UV-content of the D50

simulator according to both ISO 13655 and ISO 3664.

For proofing substrates, the following additional properties shall be communicated.

l) Storage conditions (as per Clause 5.12)

Recommended storage conditions shall be specified due to the importance of proofing substrates to colour management.

For sheet-fed offset printing substrates, the following additional properties should be communicated.

m) Bending Resistance (Bending Stiffness) (as per Clause 5.13)



Paperdam Working Plan 2013

� ISO TC 130 Graphic Technology

– Editing ISO DIS 15397 « Communication of Graphic Paperproperties »

– Contribute to ISO 12647 series, definition of paper classification and properties for prepress, Offset, Gravure, News.

– Follow-up of WG 13 Conformity assessment

– Follow-up of WG 11 Environment and Carbon Footprint. (Eurograph positions)

� ISO TC 6 Paper and Board

– Optics (Brightness, Whiteness)

– Aging.

– Paper testing with AutoLab /PM gauges (ISO 18522 editing)



Messages summary

� D50 for printing and D65 or C in specific case for paper.

– We need both

� Priority is calibration of printers equipments. For BOTH:

– viewing booth

– testing tools as per ISO 13655

� All explanations in ISO 15397



Please visit our websitefor more information

www.paperdam.org

2013 10 24


Supporting slides



DIS 15397 specific comments for Gravure

� Optics, Color coordinate, Whiteness/Brightness

– For visual appreciation, paper Brightness and/or Whiteness shallbe used.

– In Prepress, the communication of Color coordinates LAB as per D50 should be seen as an excellent improvement to manage prepress Color Management and color profiles. The ColorCoordinates as per D65 must only be used to set up paperspecifications when needed.

� Ink penetration.

– Some players mentioned Ink Penetration as a property to beincluded. During previous discussions, it was agreed that therewas no ISO Standard existing to address this property, and thatPPS Roughness was the most relevant property to address thisissue among others.



INTERNATIONAL STANDARD

ISO13655

Second edition2009-##-##

Graphic technology — Spectral measurement and colorimetric computation for graphic arts images

Technologie graphique — Mesurage spectral et calcul colorimétrique relatifs aux images dans les arts graphiques



ISO TC 6/N1756 Date: 2013-09-17

ISO/FDIS 2469:2013(E)

ISO TC 6//WG 3

Secretariat: SCC

Paper, board and pulps — Measurement of diffuse radiance factor (diffuse reflectance factor)

Papier, carton et pâtes — Mesurage du facteur de luminance énergétique diffuse



ISO DIS 12647-4 Paper properties

39 Luc LANAT ERA EHS-Paper Munich

Graphic technology — Process control for the production of half-tone colour separations, proofs and production prints — Part 4: Publication gravure printing

Technologie graphique — Contrôle des processus de confection de sélections couleurs tramées, d'épreuves et de tirages — Partie 4: Processus impression héliogravure publication

2013 10 24


ISO DIS 12647-4 Paper properties


Ehs1302 annex vi lanat d65 vs d50 20131025

Presentations & Public Speaking

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