Working together toward greater efficiency   Practical Evaluation ofSpectrophotometers for Color   Management Purposes    ...
Introduction                         • Flemish Innovationcenter for Graphic                           Communication  Conte...
Introduction                         • Do we understand the printing proces?  Contents  • Introduction  • Color Measuring ...
Introduction                         • Do we understand the printing proces ?  Contents  • Introduction  • Color Measuring...
Introduction                         • Process control                               • ISO standards (TC130)              ...
Introduction                         • Process control                               • Measurement Reports                ...
Color Measuring
Color Measuring                         • What can be measured in the printing                           process?         ...
Color Measuring                         • Color measuring devices                               • Concept  Contents  • Int...
Color Measuring                         • Color measuring devices                               • Distinctions: Light Sour...
Color Measuring                         • Color measuring devices                               • D50 light (theoretical) ...
Color Measuring                         • Color measuring devices                               • Gas Filled Tungsten (mos...
Color Measuring                         • Color measuring devices                               • White LED (recent)  Cont...
Color Measuring                         • Color measuring devices                               • Other Distinctions: Scan...
Color Measuring                         • Color measuring devices                               • Scanning Interval: examp...
Color Measuring                         • Color measuring devices                               • Other Distinctions: Band...
Color Measuring                         • Color measuring devices                               • Other Distinctions: Geom...
Color Measuring                         • Elements of a color measurement                               • Measurement Resu...
Color Measuring                         • Elements of a color measurement                               • Reliability     ...
Spectrophotometers
Spectrophotometers                         • Starting point                               • Practical Research            ...
Spectrophotometers                         • Repeatability                               • Can the instrument repeat the m...
Spectrophotometers                         • Repeatability                               • Results (white patch)  Contents...
Spectrophotometers                         • Repeatability                               • Results (blue patch)  Contents ...
Spectrophotometers                         • Accuracy (general)                               • Can the instrument measure...
Spectrophotometers                         • Accuracy                               • Results  Contents  • Introduction  •...
Spectrophotometers                         • Accuracy (detail)                               • Which colors can the instru...
Spectrophotometers                         • Accuracy                               • Results                             ...
Spectrophotometers                         • Accuracy                               • Results                             ...
Spectrophotometers                         • Accuracy                               • Results                             ...
Spectrophotometers                         • Accuracy                               • Results                             ...
Spectrophotometers                         • Accuracy                               • Results                             ...
Conclusions
Conclusions                         • Technological evolution                                     • Search for more suitab...
Future Work                         • Expansion toward measurement tables                           in press rooms        ...
Thanks :-)
Titel seminarieWorking together toward greater efficiency
Strategic partners VIGC
Upcoming SlideShare
Loading in …5
×

Practical Evaluation of Spectrophotometers for Color Management Purposes (2009)

1,257 views

Published on

Published in: Technology, Business
0 Comments
5 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
1,257
On SlideShare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
Downloads
0
Comments
0
Likes
5
Embeds 0
No embeds

No notes for slide

Practical Evaluation of Spectrophotometers for Color Management Purposes (2009)

  1. 1. Working together toward greater efficiency Practical Evaluation ofSpectrophotometers for Color Management Purposes Fons Put VIGC - 26/05/2009
  2. 2. Introduction • Flemish Innovationcenter for Graphic Communication Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 2
  3. 3. Introduction • Do we understand the printing proces? Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 3
  4. 4. Introduction • Do we understand the printing proces ? Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions Original Reproductions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 4
  5. 5. Introduction • Process control • ISO standards (TC130) • ISO 12647-2 (Print) • ISO 12647-7 (Proof) • ISO 3664 (Visual comparison Print-Proof) • Measurement strips • Print certification • Proof validation Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 5
  6. 6. Introduction • Process control • Measurement Reports • ISO 12647-2 (Print) Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 6
  7. 7. Color Measuring
  8. 8. Color Measuring • What can be measured in the printing process? • The intensity of radiated light • Unit: The CANDELA • Derivatives: Density, CIELab, brightness,… Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 8
  9. 9. Color Measuring • Color measuring devices • Concept Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 9
  10. 10. Color Measuring • Color measuring devices • Distinctions: Light Source Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 10
  11. 11. Color Measuring • Color measuring devices • D50 light (theoretical) Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 11
  12. 12. Color Measuring • Color measuring devices • Gas Filled Tungsten (mostly used) Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 12
  13. 13. Color Measuring • Color measuring devices • White LED (recent) Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 13
  14. 14. Color Measuring • Color measuring devices • Other Distinctions: Scanning Interval • Reflective measurements: 10nm interval • Lightsource measurements: 5nm interval Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 14
  15. 15. Color Measuring • Color measuring devices • Scanning Interval: examples • Reflective measurements: cyan procescolor • Lightsource measurements: fluorescent light Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 15
  16. 16. Color Measuring • Color measuring devices • Other Distinctions: Bandwidth • Minimum requirement 400/700 nm • Best: 340/780 nm Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 16
  17. 17. Color Measuring • Color measuring devices • Other Distinctions: Geometry • 45°/0° or O°/45° for reflective measurements Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 17
  18. 18. Color Measuring • Elements of a color measurement • Measurement Result • Spectral power distribution • CIELAB • Density • Tolerance (examples) • 0.3 ΔE* CIELAB • 0.15 ΔE CMC(2:1) • Average DE*94 0.4 • Reliability Contents • Do circumstances allow reliable measurements? • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 18
  19. 19. Color Measuring • Elements of a color measurement • Reliability • Example Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 19
  20. 20. Spectrophotometers
  21. 21. Spectrophotometers • Starting point • Practical Research • Performance within the company, not in lab. • Scope • 6 different types • Total of 20 measurement devices • Test-setup • Repeatability • General Accuracy • Detailed Accuracy Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 21
  22. 22. Spectrophotometers • Repeatability • Can the instrument repeat the measurement with sufficient accuracy? • Procedure • 12 consecutive measurement of a white and blue patch. • Same spot (no disposition of the instrument) • Calculation of the average CIELAB color of the 12 measurement • Calculation of the average color difference ΔE*ab Contents of the 12 measurement with the average color • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 22
  23. 23. Spectrophotometers • Repeatability • Results (white patch) Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 23
  24. 24. Spectrophotometers • Repeatability • Results (blue patch) Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 24
  25. 25. Spectrophotometers • Accuracy (general) • Can the instrument measure color accurately? • Procedure • measurement of 13 different colors of a Netprofiler color chart. • Calculation of the average CIELAB color of the 13 measured colors • Calculation of the color difference ΔE*ab of the 13 measurement with the reference of the Netprofiler chart. Contents • Averaging of the 13 calculated ΔE*ab-values. • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 25
  26. 26. Spectrophotometers • Accuracy • Results Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 26
  27. 27. Spectrophotometers • Accuracy (detail) • Which colors can the instrument measure accurately? • Procedure • measurement of 13 different colors of a Netprofiler color chart. • Calculation of the average CIELAB color of the 13 measured colors • Calculation of the color difference ΔE*ab of the 13 measurement with the reference of the Netprofiler chart. Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 27
  28. 28. Spectrophotometers • Accuracy • Results • Average of all instruments Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 28
  29. 29. Spectrophotometers • Accuracy • Results • According to Instrument type Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 29
  30. 30. Spectrophotometers • Accuracy • Results • According to Instrument Brand Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 30
  31. 31. Spectrophotometers • Accuracy • Results • According to Instrument age Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 31
  32. 32. Spectrophotometers • Accuracy • Results • According to Instrument maintenance Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 32
  33. 33. Conclusions
  34. 34. Conclusions • Technological evolution • Search for more suitable light sources is ongoing • Instrument Type • Don’r rely on older instrument types for accurate measurements • Instrument Brand • Different brands show different behaviour • Instrument Maintenance • Maintenance (white kalibration patch) is very Contents important. • Introduction • Color Measuring • Averaging • Spectrophotometers • Make use of sufficient averaged measurements to • Conclusions judge color.© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 34
  35. 35. Future Work • Expansion toward measurement tables in press rooms • Example: color accuracy Contents • Introduction • Color Measuring • Spectrophotometers • Conclusions© VIGC - 7/09/2009 Practical Evaluation of Spectrophotometers for Color Management Purposes 35
  36. 36. Thanks :-)
  37. 37. Titel seminarieWorking together toward greater efficiency
  38. 38. Strategic partners VIGC

×