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

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Presentation transcript:

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

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

Different Grays?

No, Same Gray!

Same Oranges?

Same Oranges!

7 Identify This Color

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

9 b e a d g f h i j k l c m n o p q r s t u v w x y z c

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

11 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

12 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?

13 Standard Illuminants AIncandescent-Color Temp…2856K C Ave Daylight…no UV…6774K D50Ave Daylight…inc UV…5000K D65Ave Daylight…inc UV…6504K D75Ave Daylight…inc UV…7500K F2Cool White Fluorescent F7Daylight White Fluorescent F11TL84…three narrow band white F F12Ultralume 3000

Illuminant D65 Daylight

Illuminant A Incandescent

Illuminant F2 Cool White Fluorescent

17 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

18 Light Is Color Metamerism examples

19 The Trouble with Color Color Reproduction –Language problems Color Subjectivity –Your brain on color Color Communication –Break down ahead

20 X-Rite ColorBasics Thanks Bill

21 GretagMacBeth i1Share Thanks Jav

22 Different Δ E’s Confusing but worth understanding

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

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

25 ColorMetrix Thanks Mike!

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

27 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.

28 Trending Thanks Mike!