Dipl.-Ing. [FH] Peter Karp

Transcription

1 Page 1 of 48 Fogra Forschungsgesellschaft Druck e.v. Postfach D München For: GMG GmbH & Co. KG Birgit Plautz Mömpelgarder Weg Tübingen Your contact: Peter Karp Dipl.-Ing [FH] Tel karp@fogra.org Order of: Task: Proofing system certification GMG ColorProof 04 Submitted material: FograCert Testformen A3+ Report prepared by: Documents enclosed: Dipl.-Ing. Andreas Kraushaar Dipl.-Ing. [FH] Peter Karp Certificates Fogra Forschungsgesellschaft Druck e.v. Streitfeldstraße 19 D München Tel Fax info@fogra.org Sitz der Gesellschaft ist München, Deutschland Registergericht München Vereinsregisternr Steuernr. 143/215/00707 VAT-Nr. DE The publication of this Technical Report, especially in parts, or its use in court of law requires prior consent by Fogra. Material whose return is not expressly requested will be destroyed three months after this Technical Report has been submitted. Geschäftsführer: Dr. Eduard Neufeld Dresdner Bank München BLZ Konto BIC DRES DE FF 700 IBAN DE

2 Page 2 of 48 1 Purpose This certification report comprises the FograCert Contract Proofing programm carried out with the proofing software GMG ColorProof 04 in the below mentioned configurations. As of January 2007, the FograCert Contract Proofing criteria are based on ISO [8]. Printing condition Software Proof printer 1 FOGRA39 GMG ColorProof 04 Epson FOGRA39 GMG ColorProof 04 Epson IFRA26 GMG ColorProof 04 Epson FOGRA39 GMG ColorProof 04 Epson FOGRA29 GMG ColorProof 04 Epson FOGRA39 GMG ColorProof 04 HP Z IFRA26 GMG ColorProof 04 HP Z FOGRA29 GMG ColorProof 04 HP Z2100 Proofing substrate semimatte 250 gloss 250 GMG NewsPaper 76 gloss 250 matte 140 gloss 250 GMG NewsPaper 76 matte 140 Table 1: Tested configurations. The certification was accomplished under the following climatic conditions. The average air temperature was 25 C and the relative humidity was 35%. The rooms were not air-conditioned.

3 Page 3 of 48 2 Bibliography [1] Standard ISO :2004 / Amd 1 Graphic technology Process control for the production of half-tone colour separations, proof and production prints Part 2: Offset processes [2] Dolezalek, F.: ProzessStandard Offsetdruck [PSO] Wiesbaden: Bundesverband Druck und Medien e. V., 2001 and complement of May 2003, [German language only] [3] N. N.: MediaStandardPrint 2007 Wiesbaden: Bundesverband Druck und Medien e.v., [4] N. N.: FograCert PDF/X Output Testform Spot 2.0 PDFX-ready, [5] Standard ISO :2003 Graphic Technology Prepress digital data exchange using PDF Part 6: Complete exchange of printing data suitable for colour-managed workflows [6] Standard ISO 13655:1996 Graphic Technology - Spectral measurements and colorimetric computation for graphic arts images [7] Standard ISO :2007 Paper and Board Determination of Brightness Part 1: Measurement with a 75 converging light beam TAPPI-Procedure [8] Standard ISO :2007 Graphic technology Process control for the manufacture of half-tone colour separations, proof and production prints Part 7: Proofing processes working directly from digital data

4 Page 4 of 48 3 Evaluation 3.1 Setting up the proofing system The set up procedure was done in accordance to the requirements of the supplier. Details of the set up procedure are documented in the annexes A to D. 3.2 Criteria to be tested Using FograCert Contract Proofing guidelines including the new criteria [8] the following evaluations were carried out: Proofing substrate colour and gloss Permanence and light fastness Colour accuracy [Gamut included] Drift of the solids CMYK and RGB Homogeneity Short- and long-term repeatability Rub resistance [drying] Tone value reproduction limits and reproduction of vignettes Image register and resolving power Margin information Tone value difference PDF/X compatibility At the vendors premise and for relative measurements only the proofs were measured with a X-Rite Eye One [S.Nr ] on white backing. If not stated otherwise all colorimetrical measurements have been derived by averaging five single spot measurements.

5 Page 5 of 48 4 System configuration Tables 2 to 5 describe the significant system parameters of the tested proofing system. Proof printer 1 Proof printer 2 Name Epson 7900 Epson 4800 Plant number CA1200S C Serial number Printer type Inkjet Inkjet Resolution 1440 x 720 dpi 720 x 720 dpi Proof printer driver GMG ColorProof 04 GMG ColorProof 04 Management software [Client] GMG ColorProof 04 GMG ColorProof 04 Release Operating system Windows XP Windows XP RIP [conversion PDF to TIFF] GMG RipServer GMG RipServer RIP-Release RIP serial number N. A. N. A. Printing direction bidirectional unidirectional Table 2: System features part 1.

6 Page 6 of 48 Proof printer 3 Proof printer 4 Name Epson 4880 Epson 4880 Plant number CA0000S CA0000S Serial number JZ7E Printer type Inkjet Inkjet Resolution 720 x 720 dpi 720 x 720 dpi Proof printer driver GMG ColorProof 04 GMG ColorProof 04 Management software [Client] GMG ColorProof 04 GMG ColorProof 04 Release Operating system Windows XP Windows XP RIP [conversion PDF to TIFF] GMG RipServer GMG RipServer RIP-Release RIP serial number N. A. N. A. Printing direction unidirectional unidirectional Table 3: System features part 2.

7 Page 7 of 48 Proof printer 5 Proof printer 6 Name Epson 4880 HP Z2100 Plant number CA0000S Q6677A Serial number MY6761C055 Printer type Inkjet Inkjet Resolution 720 x 720 dpi 1200 x 1200 dpi Proof printer driver GMG ColorProof 04 GMG ColorProof 04 Management software [Client] GMG ColorProof 04 GMG ColorProof 04 Release Operating system Windows XP Windows XP RIP [conversion PDF to TIFF] GMG RipServer Table 4: System features part 3. GMG RipServer RIP-Release RIP serial number N.A N. A. Printing direction unidirectional bidirectional

8 Page 8 of 48 Proof printer 7 Proof printer 8 Name HP Z2100 HP Z2100 Plant number Q6677A Q6677A Serial number MY6741C01D MY66M1C00P Printer type Inkjet Inkjet Resolution 1200 x 1200 dpi 1200 x 1200 dpi Proof printer driver GMG ColorProof 04 GMG ColorProof 04 Management software [Client] GMG ColorProof 04 GMG ColorProof 04 Release Operating system Windows XP Windows XP RIP [conversion PDF to TIFF] GMG RipServer GMG RipServer RIP-Release RIP serial number N. A. N. A. Printing direction unidirectional unidirectional Table 5: System features part 4.

9 Page 9 of 48 Name Paper mass [Manufacturer information] Substrate 1 Substrate 2 semimatte 250 gloss g/m² 250 g/m² Table 6: Paper types. Name GMG NewsPaper 76 Paper mass [Manufacturer information] Substrate 3 Substrate 4 matte g/m² 140 g/m² Table 7: Paper types. Name Used in Ink set 1 Ink set 2 Epson UltraChrome K3 Epson Stylus Pro 4880, 7900, 4800, 4880 Table 8: Ink sets. HP Vivera Ink HP Designjet Z2100

10 Page 10 of 48 5 Results 5.1 Proofing substrate colour and gloss The various paper types were evaluated against TAPPI gloss [7] using a System Lehmann gloss measuring equipment. In addition the coloration was measured [6]. The aim values for gloss and substrate colour are given Table 9. Proof substrate type L* a* b* a Gloss Unit : Glossy white > 60 2: Semi-matte white : Matte white < 20 Tolerance - ± 2 ± 2 - Table 9: Aim values for gloss and colour of proofing substrates [3]. a informative only because of lack of inter-instrument agreement caused by different UV characteristics.

11 Page 11 of 48 Table 10 depicts the gloss measurements on areas without paper simulation. Based on the classification in Table 9 [ Glossy, Semimatte and Matte ] every digital proofing paper could be classified. If the final production stock is known than a proofing substrate should simulate that substrate to a high degree. In case of the GMG NewsPaper 76 and according to ISO the colorimetrical tolerances (minimum CIEL* and ±2 for CIEa* and CIEb*) will be applied to the aim values for standard newsprint stipulated in ISO namely CIELAB = 85,2; 0,9; 5,2 (white backing). Proofing substrate semimatte 250 gloss 250 Gloss Proofing Paper category 45,3 Semi-matte 68,7 glossy GMG NewsPaper 76 3,8 matte matte 140 2,1 matte Table 10: Gloss measurements; classification of the pertinent proofing papers. The colour measurements of the unprinted substrates are shown in Table 11. The coloration of all proofing substrates (ProofPaper) are in conformance with the specified values [8] The GMG NewsPaper 76 substrate is only suited for proofs aiming to simulate standard newsprinting.

12 Page 12 of 48 Proofing substrate L* a* b* O. K.? semimatte 250 gloss 250 matte ,1-0,9-1,6 O. K. 96,2-0,9-1,7 O. K. 95,9 2,1-8,3 O. K. Table 11: CIELAB measurements of unprinted substrate; tolerances are given in Table 9. Paper L* a* b* O. K.? Standard Newsprint 85,2 0,9 5,2 - GMG NewsPaper 76 86,8-0,7 5,6 O. K. Tolerances >85,2 ±2 ±2 - Table 12: Substrate colour according ISO [white backing].

13 Page 13 of Permanence and light fastness of the proofing substrates The unprinted proofing substrates have been evaluated against permanence and light fastness according to [8]. Here each paper was subjected sequentially to the following conditions: 24 hours at 25 C and a relative humidity of 25 % 24 hours at 40 C and a relative humidity of 80 % 7 days at 40 C and a relative humidity of 10 %. For the same proofing substrate, the variability of colour under light exposure is limited by the condition that the light fastness as determined according to ISO shall be no less than 3. The test results are given in Table 13. Proofing substrate semimatte 250 semimatte 140 GMG NewsPaper 76 gloss 250 ΔE after permannence test Tol. ΔE after light fastness test for information only Tol. light fastness OK? 0,1 1,5 0,3 3 OK 1,0 1,5 3,6 3 OK 0,2 1,5 0,1 3 OK 0,4 1,5 0,6 3 OK Table 13: Permanence and light fastness of the proofing substrates [CIELAB colour difference after the light fastness test are depicted for information only]. Furthermore the primary solids CMYK have been checked with respect to permanence. The results are given in Table 14. A CIELAB colour difference of 1,5 is used as tolerance. It is planned to use this tolerance in a future revision of ISO [8].

14 Page 14 of 48 CIELAB colour difference - ΔE Result Cyan Magenta Yellow Black Tol. ΔE = 1,5 1 2,7 1,7 0,2 1,2 Not OK 2 1,1 1,1 1,4 0,7 OK 3 0,7 0,5 0,5 0,4 OK 4 1,3 0,2 1,0 0,7 OK 5 0,7 0,4 0,3 0,4 OK 6 0,9 0,7 0,7 0,2 OK 7 0,5 0,5 0,1 0,5 OK 8 0,6 0,8 1,0 0,4 OK Table 14: CIELAB colour differences of the primary solids CMYK after permanence and aging [CIELAB colour difference for information only]. CIELAB colour difference - ΔE OK? Tol. Cyan Magenta Yellow Black Light fastness 3 [according to ISO 12040] 1 0,2 0,3 0,3 0,3 OK 2 0,2 0,4 0,9 0,2 OK 3 0,5 0,4 0,5 0,3 OK 4 0,3 0,3 0,7 0,1 OK 5 0,9 0,8 0,3 0,2 OK 6 0,3 1,2 0,6 0,2 OK 7 0,5 0,4 0,4 0,2 OK 8 1,7 1,0 0,3 0,4 OK Table 15: Light fastness of the primary solids [CIELAB colour difference for information only].

15 Page 15 of Colour accuracy [gamut included] The proofs were created for the following printing conditions: FOGRA39 - Commercial printing, paper type 1 or 2, i.e. gl. or matt coated art, 115 g/m 2, periodic screen according to 60/cm [150 lpi], solids and TVI according to ISO :2004 / Amd 1 [1], TVI curves A [CMY] and B [K] FOGRA29 - Commercial printing, paper type 4, i.e. uncoated white Offset, 120 g/m 2, periodic screen according to 60/cm, solids and TVI according to ISO :2004 / Amd 1 [1], TVI curves C [CMY] and D [K] IFRA26 Newsprint on newsshade paper, periodic screening according to 40/cm, solids and TVI according to ISO Table 16 shows the resulting colour accuracy based on the Ugra/Fogra Media Wedge CMYK 2. ΔE Paper ΔE Avg ΔE Max ΔE Primaries ΔH Primaries ΔH Comp. Grey Tol ,5 1,5 OK? 1 0,4 1,0 2,0 1,9 1,2 0,3 O. K. 2 0,6 1,1 2,7 2,0 1,2 0,4 O. K. 3 1,0 0,8 2,0 1,5 0,6 0,4 O. K. 4 0,6 1,1 2,6 1,5 1,1 0,7 O. K. 5 0,8 0,8 2,3 1,1 0,4 0,3 O. K. 6 0,7 1,5 4,0 2,3 1,3 0,5 O. K. 7 0,8 1,0 1,9 1,5 0,8 0,4 O. K. 8 0,4 1,0 2,3 1,8 1,2 0,1 O. K. Table 16: : Results of proof simulation.

16 Page 16 of 48 In addition, the colorimetrical accuracy was tested by comparing the measurement values of the proofed ISO test chart [ECI2002] and the pertinent characterization data. These results as well as the gamut evaluation are given in Table 17. ΔE Avg ΔE Gamut 95% Percentile OK? Tol ,0 1,0 1,8 O. K. 2 1,0 1,2 1,9 O. K. 3 0,8 0,8 1,3 O. K. 4 1,2 1,3 2,1 O. K. 5 0,7 0,8 1,4 O. K. 6 1,8 1,8 3,2 O. K. 7 1,0 1,0 1,7 O. K. 8 0,9 1,0 1,7 O. K. Table 17: Colour difference between the ECI2002 tables and the pertinent characterization data. The results show a very high accuracy. Therefore all configurations are able to create contract proofs for the listed printing conditions.

17 Page 17 of Drift of the solids RGB and CMYK [Fading] In order to measure the fading of the solids, the proofs were measured colorimetrically at a series of elapsed time intervals [5 min, 10 min, 20 min, 30, 45 min, 60 min, 120 min and 24 h]. Table 18 shows the results measured after 30 min and then again after 24 hours. C M Y K R G B Tol. OK? 1 0,8 0,5 0,5 0,2 0,3 0,5 0,4 1,5 O. K. 2 1,1 0,4 0,7 0,2 0,6 0,4 0,6 1,5 O. K. 3 0,4 0,6 0,5 0,5 0,7 0,6 0,4 1,5 O. K. 4 0,8 0,5 0,7 0,4 0,3 0,5 0,5 1,5 O. K. 5 0,3 0,4 0,7 0,4 0,3 0,3 0,4 1,5 O. K. 6 0,9 0,2 0,3 0,4 0,4 0,6 0,3 1,5 O. K. 7 0,5 0,5 0,6 0,7 0,7 0,6 0,2 1,5 O. K. 8 0,4 0,3 0,5 0,4 0,5 0,4 0,5 1,5 O. K. Table 18: Drift of the solids; CIELAB colour difference [ΔE] between measurements after 30 min and after 24 h after printing. Thus it can be stated that the colour values after 24 h reasonably match the colours 30 min after printing within the specified tolerance.

18 Page 18 of Homogeneity [flat grey tints] Grey test forms [CMYK tone values: ; CMYK tone values: ; CMYK tone values: ] were used to evaluate the homogeneity of every combination. Colorimetrical measurements were made on 9 locations, evenly spaced across the print format. Tables 19 to 21 show the average grey tone CIELAB values, the standard deviation and the maximum ΔE with respect to the average. The variations lie well within the tolerance for the maxima and for the standard deviations. Average L* a* b* σ L* σ a* σ b* ΔE Max OK? Tol. 0,5 0,5 0, ,6 0,1-1,2 0,1 0,1 0,1 0,2 O. K. 2 70,8-0,2-2,6 0,1 0,0 0,0 0,1 O. K. 3 61,1 1,2 4,7 0,1 0,1 0,1 0,2 O. K. 4 71,9-0,3-2,3 0,0 0,0 0,1 0,2 O. K. 5 69,5 0,8-0,9 0,1 0,1 0,1 0,2 O. K. 6 71,6 0,3-2,3 0,1 0,1 0,0 0,3 O. K. 7 61,8 1,3 4,1 0,1 0,1 0,1 0,3 O. K. 8 70,0 0,6-0,5 0,1 0,1 0,1 0,2 O. K. Table 19: Results of homogeneity measurements on flat grey tint 1 [CMYK: 20,15,15,15].

19 Page 19 of 48 Average L* a* b* σ L* σ a* σ b* ΔE Max OK? Tol. 0,5 0,5 0, ,3 0,1-3,4 0,1 0,1 0,4 0,7 O. K. 2 53,3-0,8-2,2 0,1 0,0 0,1 0,1 O. K. 3 48,8 0,5 3,3 0,1 0,1 0,1 0,2 O. K. 4 54,1-1,0-2,3 0,0 0,0 0,1 0,2 O. K. 5 54,8 0,0-0,3 0,1 0,1 0,2 0,3 O. K. 6 55,4-0,3-2,7 0,1 0,1 0,1 0,2 O. K. 7 49,1 0,5 3,2 0,1 0,1 0,1 0,2 O. K. 8 55,0-0,4 0,1 0,1 0,0 0,0 0,2 O. K. Table 20: Results of homogeneity measurements on flat grey tint 2 [CMYK: 40,30,30,30]. Average L* a* b* σ L* σ a* σ b* ΔE Max OK? Tol. 0,5 0,5 0, ,1-1,0-0,9 0,1 0,1 0,2 0,3 O. K. 2 31,8-2,5-1,8 0,1 0,1 0,1 0,2 O. K. 3 39,0-0,8 2,1 0,1 0,0 0,0 0,1 O. K. 4 31,9-2,5-2,2 0,1 0,1 0,1 0,1 O. K. 5 39,2-1,2 0,0 0,1 0,1 0,1 0,3 O. K. 6 32,0-1,2-3,0 0,1 0,1 0,1 0,2 O. K. 7 39,8-0,8 1,9 0,2 0,1 0,1 0,3 O. K. 8 40,4-1,2 0,7 0,2 0,0 0,1 0,4 O. K. Table 21: Results of homogeneity measurements on flat grey tint 3. [CMYK: 65,50,50,50].

20 Page 20 of Short-term repeatability of the solids CMYK RGB and the midtones [50%] CMYK. Table 22 shows the results of the test of the short-term repeatability of the solids CMYK RGB and the midtones [50%] CMYK. One hour after an initial print, test form 2 was printed again and colorimetrically measured. All tested showed a good short-term repeatability [less than ΔE=1,5]. C M Y K R G B C 50 % M 50 % Y 50 % K 50 % Tol. 1 0,5 0,1 0,3 0,2 0,1 0,3 0,2 0,6 0,5 0,2 0,6 1,5 OK 2 0,3 0,3 0,3 0,5 0,3 0,5 0,4 0,2 0,4 0,5 0,3 1,5 OK 3 0,4 0,4 0,9 0,2 0,3 0,3 0,8 0,2 0,3 0,2 0,2 1,5 OK 4 0,8 0,6 0,3 0,7 0,4 0,9 0,8 0,4 0,5 0,3 0,4 1,5 OK 5 0,8 0,6 0,8 0,4 0,6 0,8 0,5 1,1 0,6 1,2 0,7 1,5 OK 6 0,8 0,4 0,2 0,7 0,2 0,6 0,3 0,3 0,2 0,5 0,1 1,5 OK 7 0,4 0,3 0,5 1,0 0,4 0,7 0,5 0,2 0,6 0,1 0,5 1,5 OK 8 0,6 0,2 0,5 1,1 0,6 1,1 0,4 0,2 0,4 0,2 0,3 1,5 OK Table 22: Short-term repeatability; CIELAB colour differences [ΔE] between subsequent prints [1 h]. OK?

21 Page 21 of Long-term repeatability of the solids CMYK RGB and the midtones [50%] CMYK Table 23 shows the results of the test of the long-term repeatability of the solids CMYK RGB and the midtones [50%] CMYK. On two separate days, test form 2 was printed and colorimetrically measured. All configurations show a good long-term repeatability [less than ΔE=1,5]. C M Y K R G B C 50 % M 50 % Y 50 % K 50 % Tol. 1 0,3 0,3 0,9 0,5 0,3 0,7 0,6 0,5 0,4 0,9 0,2 1,5 OK 2 0,4 0,4 0,4 0,4 0,1 0,1 0,4 0,3 0,2 0,4 0,4 1,5 OK 3 0,3 0,1 0,2 0,1 0,9 0,3 0,5 0,2 0,3 0,4 0,4 1,5 OK 4 0,2 0,4 0,2 0,2 0,6 0,8 0,4 0,3 0,4 0,2 0,6 1,5 OK 5 0,8 1,2 1,3 0,3 1,2 0,4 0,5 1,5 1,2 1,0 1,1 1,5 OK 6 1,1 0,1 0,3 0,5 0,1 0,5 0,3 0,4 0,4 0,3 0,1 1,5 OK 7 0,6 0,6 0,2 0,6 0,6 0,4 0,8 0,4 0,8 1,1 1,0 1,5 OK 8 0,6 0,5 0,6 1,1 0,1 0,5 0,5 0,4 0,7 0,7 0,9 1,5 OK Table 23: Long-term repeatability; CIELAB colour differences [ΔE] between subsequent prints [24 h]. OK?

22 Page 22 of Rub resistance [drying] The time required for printed solids [CMYKRGB] to reach mechanical stability against a rubbing action should not exceed 30 min or the print stabilization period, whichever is longer. This test was performed for each configuration for which the proofing system is to be certified. Table 24 shows the results of the visual inspection of the printed test areas and the adjacent unprinted parts for traces of the rubbing of transferred colorant. Tol. OK? 1 No significant traces. OK 2 No significant traces. OK 3 No significant traces. OK 4 No significant traces. OK 5 No significant traces. OK 6 No significant traces. OK 7 No significant traces. OK 8 No significant traces. OK Table 24: Results of the rub resistance test.

23 Page 23 of Tone value reproduction limits and reproduction of vignettes Proofs of the vignette test forms 2 and 3 were visually examined for banding. The findings for every printing condition are listed in Table 25. The test images of ISO and -3 show for all combinations no artefacts viewed under standard lighting. Results OK? 1 Smooth renditions. OK 2 Smooth renditions OK 3 Smooth renditions OK 4 Smooth renditions OK 5 Smooth renditions OK 6 Smooth renditions OK 7 Smooth renditions OK 8 Smooth renditions OK Table 25: Evaluation of vignettes. It is good prepress practice that no image parts need to rely on tone values outside of the tone value reproduction limits of the production printing process, see the pertinent part of ISO for this information. The printed tints intermediate between the (simulated) substrate white and solid shall transfer onto each print in a consistent and uniform manner over a tone value range that includes at least the tone reproduction limits of the printing condition to be simulated. This has been checked visually using the ISO Evaluation Testform.

24 Page 24 of Image register and resolving power The maximum deviation between the image centres of any two printed colour planes shall not be larger than 0,05 mm. The resolving power of each proof print shall be such that C, M, K positive, nonserif type of 2 point size, reverse [negative] of 8 point size and 2 point reverse line are legibly reproduced [8]. Also the Siemens stars of ISO have been checked. This test was carried out using the test form 3. The results are listed in Table 26. Max. deviation between image centres non-serif type of 2 point size non-serif reverse type [negative] of 8 point size 2 point reverse line OK? 1 <0,05 legible legible legible OK 2 <0,05 legible legible legible OK 3 <0,05 legible legible legible OK 4 <0,05 legible legible legible OK 5 <0,05 legible legible legible OK 6 <0,05 legible legible legible OK 7 <0,05 legible legible legible OK 8 <0,05 legible legible legible OK Table 26: Evaluation of image register and resolving power.

25 Page 25 of Margin information Every digital proof shall bear a human readable commentary [status] line according to ISO with the following information: Proofing system designation Colorants Substrate material types Printing condition to be simulated Date und time Colour management profile[s] used. All information was printed on the evaluated proofs Tone value difference The digital proof print shall reproduce the colorimetrical tone values given by the intended printing condition. Though the tone values are calculated using the method in ISO both from the CIEXYZ values of the proof and the CIEXYZ values of the intended printing condition. For all combinations the tone value difference shall be within a tolerance of ±5%. The differences for each combination are shown in Figure 1 to 8.

26 Page 26 of 48 Figure 1: Tone value difference for combination 1. Figure 2: Tone value difference for combination 2.

27 Page 27 of 48 Figure 3: Tone value difference for combination 3. Figure 4: Tone value difference for combination 4.

28 Page 28 of 48 Figure 5: Tone value difference for combination 5. Figure 6: Tone value difference for combination 6.

29 Page 29 of 48 Figure 7: Tone value difference for combination 7. Figure 8: Tone value difference for combination 8.

30 Page 30 of PDF/X compatibility A proofing system should accept and process PDF/X-files compliant to the PDF/X specifications [informative criteria of ISO ]. This was tested using the FograCert PDF/X Output test form [4]. The tested proofing system showed a compliant output. Therefore one can expect PDF/X1a and PDF/X-3 files to be accepted and processed correctly by the tested proofing system. 6 Printer family test In addition to the FograCert Contract Proofing programme different printer models have been evaluated in the light of similar output accuracy. Based on a specified proofing paper and control means (driving the printer in the pertinent print mode) different printer models are subject of colorimetrical evaluation against the printing condition FOGRA39 within tight tolerances. The following families have been scrutinized: ID Printer manufacturer 1 Epson 2 Epson Printer models of a family Epson 4880, Epson 7880, Epson 9880 Epson 4800, Epson 7800, Epson 9800 Proofing paper semimatte 250 semimatte 250 Table 27: Printer families to be tested. ID 1 2 Printer driving C_E7880_720_GMGsemimatte250_V1_iSisUV.mx3 ISOcoated_v2_ECI_39L_PK1-2_Ex880_GMGsemimatte250_V1.mx4 C_E7800_720_GMGsemimatte250_V1a.mx3 ISOcoated_v2_ECI_39L_PK1-2_Ex8_GMGsemimatte250_V2.mx4 Table 28: Description of the pertinent control means.

31 Page 31 of 48 Once a similar output has been shown a certification can be extended by the tested printer models without explicit checking of the entire system combination. The similarity (closeness between the printer models) will be defined here by the 95% percentile of the tone value patches of the ISO target of each printer to be tested against FOGRA39 by halving the tightest tolerance representing high quality industry practice. Though the CIELAB colour difference for the paper simulation ΔE=3 [8] have been used. In case these tolerances will be met the end user can be assured that the printer models out of the tested family can be used interchangeably. Practically this means that the same aim values can be used for calibration. Results: 95% Quantile OK? [Tol.: ΔE <= 1,5] Epson ,0 OK Epson ,9 OK Epson ,1 OK Table 29: CIELAB colour difference for the best 95% tone value patches Family Epson x % Quantil OK? [Tol.: ΔE <= 1,5] Epson ,0 OK Epson ,1 OK Epson ,8 OK Table 30: CIELAB colour difference for the best 95% tone value patches Family Epson x800.

32 Page 32 of 48 In addition and for information only the colorimetrical differences between each proof print and the average have been evaluated. The results are depicted in the tables 31 and 32 where the individual measurements have been compared against the average taken from the three IT8/7.4 test charts. 95% Quantile Max. Colour difference Mean colour difference Epson ,4 1,1 0,2 Epson ,4 1,3 0,2 Epson ,5 2,3 (99% Quantil = 0,8) 0,3 Table 31: Statistical evaluation of the proof prints compared to the mean Family Epson x % Quantile with respect to the mean Max. colour difference with respect to the mean average colour difference with respect to the mean Epson ,5 1,6 0,3 Epson ,9 2,4 0,5 Epson ,9 2,1 0,6 Table 32: Statistical evaluation of the proof prints compared to the mean Family Epson x800. It could be shown that the tolerance have been met satisfactorily. Thus for each compliant system combination it can be stated that the here tested printer models, using the same calibration means and proofing paper, can be used interchangeable.

33 Page 33 of 48 7 Conclusion The configurations listed in Table 33 were subject to this certification: Printing condition Software Proof printer 1 FOGRA39 GMG ColorProof 04 Epson FOGRA39 GMG ColorProof 04 Epson IFRA26 GMG ColorProof 04 Epson FOGRA39 GMG ColorProof 04 Epson FOGRA29 GMG ColorProof 04 Epson FOGRA39 GMG ColorProof 04 HP Z IFRA26 GMG ColorProof 04 HP Z FOGRA29 GMG ColorProof 04 HP Z2100 Table 33: Tested configurations. Proofing substrate matte 140 gloss 250 GMG NewsPaper 76 matte 140 semimatte 250 gloss 250 GMG NewsPaper 76 gloss 250 All configurations have been positively tested according to the Fogra Contract Proofing System criteria: Proofing substrate colour and gloss Permanence and light fastness Colour accuracy [Gamut included] Drift of the solids CMYK and RGB Homogeneity Short- and long-term repeatability Rub resistance [drying] Tone value reproduction limits and reproduction of vignettes Image register and resolving power Margin information Tone value difference PDF/X-compatibility

34 Page 34 of 48 The evaluation of the Ugra/Fogra Media Wedge CMYK 2 has shown for all configurations that the proofing software GMG ColorProof 04 produce proofs that comply with the listed printing conditions. For the configurations where FOGRA39 has been simulated a purchaser of these systems can be sure that other printing conditions that have smaller colour gamuts [e.g. FOGRA28] will be equally well simulated, however the appropriate simulation of the printing stock gloss will need to be taken into account. The proofing systems GMG ColorProof 04 as tested therefore fulfils all criteria of the FograCert Contract Proofing system programme. Fogra Graphic Technology Research Association Dipl.-Ing. A. Kraushaar Dipl.-Ing. [FH] Peter Karp

35 Annex provided by GMG Page 35 of 48 Annex A In the following appendix the procedure will be described exemplarily for the HP Z2100. The detailed description can be found in the tutorial GMG-ColorProof_HowTo_AutoCaliWizard_en.pdf. The calibration of other printers, e. g. Epson 4880 can be found in the manual GMG-ColorProof_Tutorial_PrinterCalibration_en.pdf. 1. Calibration 1.1 Introduction This tutorial will walk you through a printer calibration utilizing the GMG ColorProof software. The HP Designjet Z2100 printer generation has a build in measurement device. The step by step documentation below will use this internal device. 1.2 Basics The GMG printer calibration is saved with the mx3 file format. It describes a defined and reproducible standard color behavior. It includes the definition of printer, paper and ink combination. Based on this color definition it is possible at any given point in time to compensate for eventually accruing color variations with a calibration cycle in GMG ColorProof. This ensures a stable, reproducible production of contract proofs. The time interval for a calibration cycle depends on following factors: o Printer type: used inkjet technology o Climate conditions: variation in humidity and or temperature o Ink or media change GMG recommends a daily verification of the calibration. A calibration cycle should be done after every media or ink change. Please be aware that depending on the printer technology, it might need a couple of prints after the change of the ink cartridge until the new ink is actually used at the print head.

36 Annex provided by GMG Page 36 of 48 Every mx3 calibration is based on certain printer settings, like resolution, print mode, ink configuration, paper type etc. Additional information can be found at Printercalibrations.pdf in the folder C:\ColorProof \Printers or on the GMG support webpage Testcharts For Printercalibrations the GMG Testchart TC3 is used in general. The layout depends on the used measurement device. In this case, the GMG HP-TC3-24.tif test chart will be used. It contains 522 color combinations, which will be measured with the internal spectrophotometer. 1.4 Automatic calibration of the HP Designjet Z2100 The calibration of the HP DesignJet Z2100 is very comfortable integrated in the GMG ColorProof application. After initially setting up the printer it can be calibrated fully automated via one click of a button or scheduled with a timer. Printer settings: The tolerances for automatic calibration only need to be defined once.

37 Annex provided by GMG Page 37 of 48 Illustration 1: settings for automated calibration. Illustration 2: printer settings for automated calibration.

38 Annex provided by GMG Page 38 of 48 The automated calibration can be started via right click on the printer and Automatic calibration... GMG ColorProof will do all necessary iterations automatically until the defined thresholds are achieved. Illustration 3: Start of automatic calibration. After the calibration is completed, the mx3-file is automatically updated and saved. Illustration 4: Calibration assistant.

39 Annex provided by GMG Page 39 of GMG RipServer The GMG Ripserver is installed automatically with the set-up. Start it via Start Programs GMG ColorProof o4 RipServer. Manual rip process of PDF-files via the button New Job. Illustration 5: Selecting button New Job. Select the desired PDF files. Illustration 6: Selecting PDF files.

40 Annex provided by GMG Page 40 of 48 Configuration of the RipServer settings: Illustration 7: GMG RipServer - Setting 1.

41 Annex provided by GMG Page 41 of 48 Illustration 8: GMG RipServer - Setting 2.

42 Annex provided by GMG Page 42 of 48 Illustration 9: GMG RipServer - Setting 3.

43 Annex provided by GMG Page 43 of 48 Illustration 10: GMG RipServer - Setting 4.

44 Annex provided by GMG Page 44 of 48 Illustration 11: GMG RipServer - Setting 5.

45 Annex provided by GMG Page 45 of 48 3.Manual print job with GMG ColorProof After the calibration several test files are printed on the HP DesignJet Z2100. Therefore the calibration file HP_Z2100_1200dpi7cMatteBlack_GMGmatte140_V1_HP-embi1_UVcut.mx3 and the color profile HP_Z2100_1200dpi7cMatteBlack_GMGmatte140_ISOuncoated29L_ V1.mx4 was used to simulate the printing condition IsoUncoated Fogra29L. Move to the Program GMG ColorProof. Choose File New Job. Illustration 12: New Job in GMG ColorProof

46 Annex provided by GMG Page 46 of 48 The following window opens: Illustration 13: Choose printer und color profile (MX4). As printer select HP Z2100 and HP_Z2100_1200dpi7cMatteBlack_ GMGmatte140_ISOuncoated29L_V1.mx4 as color profile. The profile can be found under C:\Colorproof\reference profiles\... Add the test files via right mouse button Add

47 Annex provided by GMG Page 47 of 48 Illustration 14: Add test files. Please switch to the HP Designjet Z2100 Photo 24 (44 ) tab. Illustration 15: Printer settings HP Z2100.

48 Annex provided by GMG Page 48 of 48 The default settings from the installed printer will be used as printer settings. To print the job use the button or print via job print.