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∆ E Demystifed

∆ E Demystifed. Presented by Jim Raffel ColorMetrix 4th Annual User Group Meeting August 8-10, 2004 Las Vegas, Nevada. Δ E. Let’s Demystify it. Review Norm’s Presentation Last year…. Different Grays?. No, Same Gray!. Same Oranges?. Same Oranges!. Identify This Color. c.

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∆ E Demystifed

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  1. ∆ EDemystifed Presented by Jim Raffel ColorMetrix 4th Annual User Group Meeting August 8-10, 2004 Las Vegas, Nevada

  2. ΔE • Let’s Demystify it. • Review Norm’s Presentation Last year…

  3. Different Grays?

  4. No, Same Gray!

  5. Same Oranges?

  6. Same Oranges!

  7. Identify This Color

  8. c Which Color Is It? w q b o f d y r l s p u e j x c h m g a v k z i n t

  9. c Which ones are within 3 ΔE? w q b o f d y r l s p u e j x c h m g a v k z i n t

  10. 3 ΔE…What’s That?!?!? • Pilot Color Tolerance Exercise • Paired comparison of groups of colors • We will all do it individually • Then share our results

  11. Global Results • Avg. Consumer - 12 • Avg. Designer – 6-8 • Avg. Print Buyer 4-6 • Avg. in this room 2-4 (best guess 2 weeks ago) • …but…the lighting in this room?

  12. Standard Illuminants • A Incandescent-Color Temp…2856K • C Ave Daylight…no UV…6774K • D50 Ave Daylight…inc UV…5000K • D65 Ave Daylight…inc UV…6504K • D75 Ave Daylight…inc UV…7500K • F2 Cool White Fluorescent • F7 Daylight White Fluorescent • F11 TL84…three narrow band white F • F12 Ultralume 3000

  13. 400 500 600 700 Illuminant D65 Daylight

  14. 400 500 600 700 Illuminant A Incandescent

  15. 400 500 600 700 Illuminant F2 Cool White Fluorescent

  16. Concept of Metamerism • It is possible to alter the appearance of a color by varying the viewing conditions • Metamerism is where two colors may match under one illuminant but not another

  17. Light Is Color • Metamerism examples

  18. The Trouble with Color • Color Reproduction • Language problems • Color Subjectivity • Your brain on color Color Communication • Break down ahead

  19. X-Rite ColorBasics Thanks Bill

  20. GretagMacBeth i1Share Thanks Jav

  21. Different Δ E’s Confusing but worth understanding

  22. The ΔE’s • CIELab ΔE • CMC(2:1)ΔE • CIE94 ΔE • There are more…. • Why did I pick these three?

  23. Why did I pick these three? • Because…. • These are the three ColorMetrix fully supports! • Let’s see how they can differ and why.

  24. ColorMetrix 1.8.8 Thanks Mike!

  25. The ΔE’s • CIELab ΔE – 75% “accurate” • CMC(2:1)ΔE – 85-90% “accurate” • CIE94 ΔE – 90-95% “accurate” • Compared to human eye

  26. Jim’s Simple Advice • Pick ONE ΔE formula and stick with it. • Important to compare apples to apples. • Your customer may pick for you. • Otherwise try to use the one most popular in your industry…. • CIELab ΔE for commercial printers. • CMC(2:1)ΔE for packaging printers.

  27. Trending 1.1.3 Thanks Mike!

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