Communicating Color for Grand Format Printers


Published on

Learn tips and techniques for improving color matching for grand format printers.

Published in: Business, Technology
  • Be the first to comment

No Downloads
Total views
On SlideShare
From Embeds
Number of Embeds
Embeds 0
No embeds

No notes for slide

Communicating Color for Grand Format Printers

  1. 1. Communicating Color for Grand Format Printers X-Rite Color Management for Grand Format Printers
  2. 2. Sponsor • X-Rite is the global leader in color science and technology • Pantone is part of the family • Mature product line for printing and graphic arts markets
  3. 3. Today's Speaker – Dan Reid o Founded in 1998 to help business realize the benefits of color management o Consulting and product sales for some of the largest and smallest print providers o Early adopter of G7 calibration technique for non-litho applications. Certified by IDEAlliance in 2006 (866) RGB-CMYK
  4. 4. First Webinar o PDF Slides – o Recorded Webinar – Part 1 — Printer Calibration
  5. 5. Second Webinar o PDF Slides – o Recorded Webinar – • This is webinar is also being recorded o We will send links to the slides and recording Part 2 — G7 for Grand Format
  6. 6. (1st Poll Question) • What is the BIGGEST challenge you face in matching color?
  7. 7. • Why is this so difficult? (2nd Poll Question)
  8. 8. • Printing has always been a challenge o Today we are communicating intentions better than before o Better quality printing today. Able to quantify color matches based on how we respond to color • Color Matches traditionally are by agreement amongst mechanical specifications and not visually • 21st Century brought visual matching to printing industry Quick History of Color Communication
  9. 9. • Pantone Matching System (PMS) – the ubiquitous method of communicating color o Has evolved with the market for decades • Pantone has reacted to changes in printing technologies and customer needs • Downside – there are many versions! • Need to be mindful of what (Pantone palette) version is loaded in your Adobe apps o May not correlate to the fan book in your hand • CMYK builds in a fan book are only useful if “color managed” to simulation ICC output profile • You need LAB specifications to accurately match Pantone Matching System
  10. 10. • Pantone Matching System (PMS) – the ubiquitous method of communicating color o LAB definitions are the best way of communicating color • Allow seamless translation to printer ICC profile o Takes advantage of the full color gamut of printing device • Easy to quantify a color match to LAB reference o No LAB reference? • Measure the customer supplied sample to determine LAB target values • Measure (old) PMS fan book if that is the gold master in your shop o (Consider purchasing a newer version of your current fan book since your Adobe CS app may have different library loaded by default) Pantone Matching System
  11. 11. • Pantone Color Manager (Software) o Included with purchases of new PANTONE Plus series fan books and X-Rite i1 product line (i1Basic Pro2, i1Photo Pro2, i1Publish Pro2) o Allows easy updating of Adobe CS apps with the libraries of current fan book references o Does a whole lot more • Extract colors from images • Create custom libraries based upon output ICC profile o Load these custom libraries in Adobe CS apps • Create color libraries that can be used for “optimization” in ICC profile iteration within X-Rite i1Profiler software Pantone Color Manager
  12. 12. Pantone Color Manager
  13. 13. Isn’t my densitometer Good enough? X-Rite i1Pro2 Spectrophotometer X-Rite 530 Spectrodensitometer
  14. 14. • Traditionally Densitometers were the gold standard in color communication o Densitometry can not differentiate between different hues of ink o Densitometry essentially measures how much ink is piled on the substrate. Does not quantify what the color of ink looks like -- just quantity of ink o Matching against density (and dot gain) sometimes resulted in agreeable match • Spectrophotometers are the new standard You should be printing at 1.35C!
  15. 15. • Spectrophotometers measure color Spectrophotometers (SpectroDensitometers) o Precisely defines quantity of reflectance in different portions of spectrum o Source info that can be adapted to density, different lighting (illuminants), and RGB or CMYK(+) color models
  16. 16. • Spectrophotometers are appropriate for Grand Format Printers o Densitometers are not – filtration engineered for lithographic inks – not grand format inks Spectrophotometers (SpectroDensitometers)
  17. 17. Spectrophotometers • Useful for determining LAB reference for customer supplied samples o Could be print o Could be non-print
  18. 18. Spectrophotometers Must be tethered to a computer and have software to acquire the data
  19. 19. • Allows quick look up of closest PMS color from measured color • Included video camera allows easy measurement • Averages 30+ samples at different angles to get a good representation of the color o Allows measuring non-paper surfaces PANTONE Capture
  20. 20. PANTONE Capture
  21. 21. • Invariably source files are either RGB or CMYK • RGB files converted by their nature are neutral • Files from RGB to CMYK are typically a US Web Coated (SWOP) v2 or GRACoL (2006) separations • Though US Web Coated in not based on G7 using GRACoL as a source ICC profile in your RIP usually works So what about regular RGB and CMYK files?
  22. 22. Can you see a difference? GRACoL – ICC profile Assigned US Web Coated (SWOP) v2 – Original
  23. 23. GRACoL – ICC profile Assigned US Web Coated (SWOP) v2 – Original Can you see a difference?
  24. 24. • ICC profiles are usually RGB or CMYK • Special ICC profiles called Device Link ICC profiles can improve color translation o Device Links can be RGB to CMYK or CMYK to CMYK o Typically used as CMYK to CMYK conversions ICC Profiles
  25. 25. Device Link ICC Profiles • Best way to handle color conversion o No trip through LAB o “Baked” color conversion o Fastest since all calculations are done • Typically ICC color conversions require more processing o Best method for scaling source color to destination color gamut • Several Device Link creation products are available
  26. 26. Device Link ICC Profiles Device Link Software: o Offers features on how to handle scaling (rendering intent + BPC) from one color space to another o Purity of colors • (ie, 100% magenta is maintained in destination with no contamination of other colors) • How to feather the purity through the tonal range o Black generation preservation • Maintain text as black ink instead of 4/C black • Option to re-separate to drop ink coverage or modify GCR settings for final output device
  27. 27. Device Link ICC Profiles • X-rite i1Profiler v1.5 ads Device Link Profiling o Free Update o CMYK to CMYK ICC Device Link Profiles o Quality of device link is directly related to quality of source and destination ICC profiles o Unlike proofing workflows, you will want to use relative colorimetric to get the most pleasing results. Black point compensation is helpful when source ICC profile has darker blacks than destination
  28. 28. Standard ICC Profile Conversion CIE L*a*b* (profile connection space) CMYK CMYK Typical ICC Color Management Conversion
  29. 29. Device Link ICC Profiles Device Link ICC Color Management Conversion CMYK CMYK (no conversion through LAB)
  30. 30. Device Link ICC Profile Support • All leading Grand Format RIPs support Device Link ICC profiles o EFI o Caldera o Onyx • Different support and use of Device Link profiles in each RIP • Depending on the RIP you will load the device link ICC Profile: o Most of the time it will be loaded as an input ICC profile for conversion of legacy files to new color reference • (US Sheetfed Coated v2 to GRACoL) o Could be loaded as an output ICC profile if converting from source (GRACoL) to printer output ICC profile
  31. 31. How close is good enough? • ISO 12647 is useful mainly for traditional printing technologies like offset lithography, flexographic, proofing • ISO 12647 does not really address Grand Format Printing • ISO 12647-8 attempts address digital printing o “Validation print processes working directly from digital data” o “..... conformance of systems that produce a hard-copy validation print, directly from digital data, which is intended to simulate the expected appearance of material printed in accordance with a characterized printing condition” o Written for laser and toner printer market for non-contract quality proofing
  32. 32. How close is good enough? • ISO 12647-7 is for validating proofing o Digital printing is pretty much a proofing workflow in that you have to match a (source) file o Validating your printing system consistently meets an agreed target and tolerance • Decreases waste and unexpected results • Able to be more confident color matching is being done correctly • Agreement upon what's acceptable and unacceptable printing at your shop
  33. 33. New Kid on the Block! IDEAlliance ISO 12647-7 2013 (84 patches) Over 50% sample increase! IDEAlliance ISO 12647-7 2007 (54 patches)
  34. 34. New Kid on the Block! IDEAlliance ISO 12647-7 2013 (84 patches) UGRA/FOGRA v3.0a (72 patches)
  35. 35. IDEAlliance ISO 12647-7 2013 IDEAlliance ISO 12647-7 2013 (84 patches) • Not supported widely yet • Future support in X-Rite i1Profiler o No support in X-Rite i1Profiler v1.5
  36. 36. Questions and Answers Discuss this topic further: #commcolor Type your questions into the side bar on right.
  37. 37. Communicating Color for Grand Format Printers X-Rite Color Management for Grand Format Printers