Is Quality Control in the Printindustry Build on Quicksand? (2009)
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This document discusses quality control in the printing industry. It notes that customers demand quality but quality is difficult to define precisely. A study by VIGC found significant variations between spectrophotometers used for quality control. Measurements of the same color could differ by more than tolerance levels customers require. Factors like maintenance, age, scanning interval, and bandwidth may contribute to these variations. The document concludes that quality control depends on spectrophotometers, but deviations occur between devices, types, and brands. Regular maintenance and calibration are important to minimize variations that could lead to print jobs being rejected.
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Is Quality Control in the Printindustry Build on Quicksand? (2009)
- 1. Working together toward greater efficiency Is Quality Control In The Printing Industry Build On Quicksand? Eddy Hagen VIGC – 15/10/2009
- 2. Introduction • Flemish Innovationcenter for Graphic Communication • Not for profit organisation, based in Turnhout (Belgium) • Services: • Education • Trendwatching • Consulting • Networking Contents • Introduction • Customers want… • Findings • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 2
- 3. What do customers want?
- 4. What do customers want? • Customers want quality! • VIGC Survey (2007): second reason why they changed print supplier (first reason: cost…) • But how do you define quality? • Looking good? • Rather subjective… • Looking similar to reference? • Previous job? • Pantone book? Contents • Other references? • Introduction • Measured (color) values are within specified • Customers want… tolerances? • Findings • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 4
- 5. What do customers want? Quality! • Measuring color • Densitometer: measures density, not color! • Spectrophotometer! • Color deviations: delta E • Distance between two colors in a 3D-space • But a ‘warped’ 3D-space… • But which delta E? • Delta E*ab, CIE 94, CMC, CIEDE2000 • Due to ‘warped’ 3D-space: same number of delta E*ab does not always have same perceived Contents difference (visual) • Introduction • Customers want… • Findings • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 5
- 6. What do customers want? Quality! • Which tolerances? • E.g. ISO 12647-2 (solid process colors) • Deviation tolerance (proof vs ok print): delta E*ab = 5 • Variation tolerance (ok print vs rest of run): delta E*ab = 4 (KCM) or 5 (Y) • Customer defined tolerances… • E.g. large FMCG (fast moving consumer goods) companies Contents • Introduction • Customers want… • Findings • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 6
- 7. What do customers want? Quality! • So: quality control depends heavily on use of spectrophotometers • But how good are they? • Deviations between measurements with the same device • ‘Cold’ vs ‘warm’ device… • Deviations between instruments • This means troubles! • Printer measures, print job is within tolerances Contents • Customer measures with his device, print job is out • Introduction of tolerances • Customers want… • And job gets rejected… • Findings • Who is to blame??? • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 7
- 9. VIGC study on spectrophotometers • What did we do? • Measurements with > 20 devices, used in production (not right out of the box!) • 6 types, multiple brands • Reference: Netprofiler test chart + certificate with correct values (CIELAB) Contents • Introduction • Customers want… • Findings • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 9
- 10. VIGC study on spectrophotometers • What did we find? • Some findings are not really encouraging… • Published in September 2008 • Lots of reactions, from all over the world Contents • Introduction • Customers want… • Findings • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 10
- 11. VIGC study on spectrophotometers • What did we find? • Repeatability (12 measurements, white patch) Contents • Introduction • Customers want… • Findings • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 11
- 12. VIGC study on spectrophotometers • What did we find? • Repeatability (12 measurements, blue patch) Contents • Introduction • Customers want… • Findings • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 12
- 13. VIGC study on spectrophotometers • What did we find? • Accuracy (measured results vs certificate) • Average per type Contents • Introduction • Customers want… • Findings • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 13
- 14. VIGC study on spectrophotometers • What did we find? • Accuracy (measured results vs certificate) • Average of all instruments, per color Contents • Introduction • Customers want… • Findings • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 14
- 15. VIGC study on spectrophotometers • What did we find? • Accuracy (measured results vs certificate) • Average per type, per color Contents • Introduction • Customers want… • Findings • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 15
- 16. VIGC study on spectrophotometers • What did we find? • Accuracy (measured results vs certificate) • Average two brands, per color Contents • Introduction • Customers want… • Findings • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 16
- 17. VIGC study on spectrophotometers • What did we find? • Accuracy (measured results vs certificate) • Old instrument vs more recent one Contents • Introduction • Customers want… • Findings • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 17
- 18. VIGC study on spectrophotometers • What did we find? • Accuracy (measured results vs certificate) • Maintenance: not vs well maintained Contents • Introduction • Customers want… • Findings • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 18
- 19. VIGC study on spectrophotometers • What did we find? • Accuracy (measured results vs certificate) • Handheld vs measurement table printing press… Contents • Introduction • Customers want… • Findings • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 19
- 20. VIGC study on spectrophotometers • What did we find? • Differences between instruments can be higher than tolerances customers demand! • Certainly differences between different brands in specific colors • Don’t mix measurements! • Calibrate on a regular basis! • Maintenance is absolute necessity! • E.g. dust… Contents • E.g. dirty calibration tile… • Introduction • More recent types have lower deviations • Customers want… • Findings • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 20
- 21. VIGC study on spectrophotometers • What might have caused deviations? • Next to maintenance, … Contents • Introduction • Customers want… • Findings • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 21
- 22. VIGC study on spectrophotometers • What might have caused deviations? • Light source: light bulb, LED, … Contents • Introduction • Customers want… • Findings • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 22
- 23. VIGC study on spectrophotometers • What might have caused deviations? • Scanning interval • ISO 13655:1996 specifies – Min. 20 nm – Best 10 nm Contents • Introduction • Customers want… • Findings • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 23
- 24. VIGC study on spectrophotometers • What might have caused deviations? • Scanning interval • Difference 10 nm vs 20 nm (research by Yoshi Ohno) Is Quality Control In The Printing Industry Build On Quicksand? 24
- 25. VIGC study on spectrophotometers • What might have caused deviations? • Bandwidth • ISO 13655:1996 specifies – Min. 400-700 nm – Best 340-780 nm Contents • Introduction • Customers want… • Findings • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 25
- 26. Conclusions
- 27. Conclusions • Customers demand quality • Spectrophotometers are key for quality control • But deviations occur… • Between individual devices • Between types • Between brands • Maintenance is important! Contents • Introduction • Customers want… • Findings • Conclusions Is Quality Control In The Printing Industry Build On Quicksand? 27
- 28. Thanks :-)
- 29. Titel seminarie Working together toward greater efficiency