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Robert Grotans Western Michigan University December 7 2010 Overview Background Experimental Results Conclusion Understanding Color Illuminant Sample Spectrum Standard Observer What is Color Gamut ID: 541866 Download Presentation
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Presentation on theme: "The Effects of Clear Toner on the Color Gamut of a Digital"— Presentation transcript
Slide1
The Effects of Clear Toner on the Color Gamut of a Digital Press
Robert Grotans
Western Michigan University
December 7, 2010Slide2
Overview
Background
Experimental
Results
ConclusionSlide3
Understanding Color
Illuminant + Sample Spectrum + Standard ObserverSlide4
What is “Color Gamut”?
1931 x, y Chromaticity DiagramSlide5
Profiling1. Calibrate your device2. Print, display, or scan a test chart
3. Measure the test chart4. Use profiling software5. Produce a profileSlide6
Experimental
List of Substrates
Substrate
Name
GSM
1
20# Hammermill Bond
75
2
24# Beckett Writing (super smooth)
90
3
60# Husky Opaque Offset
89
4
60# 4CC Storaenso Cover
160
5
80# Sappi Flo Gloss Digital Text
118Slide7
1. Calibrate The DeviceShading CorrectionGradation Auto AdjustFiery RIP CalibrationSlide8
2. Print a Test Chart
ECI2002R CMYK test chartSlide9
3. Measure the Test ChartSlide10
4. Use Profiling SoftwareSlide11
5. Produce a ProfileInstall profileVerify profile for accuracySlide12
Analysis
Gamut ComparisonLAB Value Comparison(39.79, 15.83, 18.12)(44.01, 16.07, 17.5)Slide13
GretagMacbeth™ ColorChecker Slide14
CalculationsΔE = √(L1
-L2)2 + (a1-a2)2 + (b1-b2)2 = √(39.79-L2
)2 + (15.83-a2
)
2
+ (18.12-b
2
)2 = √(39.79-44.01)
2 + (15.83-16.07)2 + (18.12-17.5)2
ΔE = 4.27
ΔL = (L1-L2) =(39.79-44.01) = -4.22ΔC = √(a12+b12) - √(a2
2+b22) = √(15.832
+18.122) - √(16.072+(-17.5)2
) = 0.3Slide15
Sample 1 – 20# Hammermill Bond
Without 312,879
With 228,669Slide16
Sample 2 – 24# Beckett Writing
Without 322,846
With 255,525Slide17
Sample 3 – 60# Husky Offset
Without 338,949
With 239,272Slide18
Sample 4 – 60# Cover
Without 404,957
With 267,681Slide19
Sample 5 – 80# Gloss Text
Without 330,186
With 242,463Slide20
LAB Values
Clear Toner Over Vs. Clear Toner Under
Substrate
ΔE
Δ
L
Δ
C
1
3.18
-1.87
1.08
2
2.47
-1.19
0.31
3
1.54
-0.06
0.17
4
3.11
-1.88
0.74
5
2.15
-0.58
1.15Slide21
LAB Values
Without Clear Toner Vs. Clear Toner Over
Substrate
ΔE
Δ
L
Δ
C
1
4.78
-0.59
-3.20
2
4.60
-2.46
-3.01
3
7.22
-1.65
-4.29
4
6.86
-1.74
-3.68
5
4.75
-1.42
-2.81Slide22
ConclusionNot a lot of difference between clear toner over or underClear toner originally reduced the color gamut by 20-35%Knowledge gained
Recommendations
PaperOriginal Clear TonerNew Clear Toner
94.7, 2.1, -7
88.3, 1.8,-6.2
92.1, 2.1, -6.7Slide23
Special ThanksMark Gundlach and Michelle DeFouw, X-RiteDr. FlemingPCI DepartmentSlide24
Thank You!
Questions?