print production – from #color19 design to print for packaging · print buyer wants § best color...
TRANSCRIPT
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#COLOR19Print Production – From
Design to Print for Packaging
Birgit Plautz
Eric Dalton
GMG Americas
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About the Presenters
§Birgit Plautz§ Manager of Technical Services
– GMG Americas§ 20 years experience in the
industry§ 8th Color Management
Conference
§Eric Dalton§ Director of Sales, West Region
– GMG Americas§ 17 years experience in the
industry§ 14th Color Management
Conference
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In the upcoming 60 minutes you will …§ get to know color management and different
PrePress workflows in packaging
§ see how you benefit from a good color communication
§ learn about the challenges of color management in package printing
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Printing Basics
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Printing Basics
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Packaging
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Traditional package printing methods
Rotogravure Offset Flexography
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Digital Printing in packagingInkjetElectrophotography
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Color
Match?One color?
Gravure on magazine paper
Offset on coated cardboard
Different technologies and substrates!
Offset on newspaper
Print buyer
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Print buyerwants
§ Best color match to his product
§ Identical colors between brochures, advert in newspaper, packaging, etc.
§ Same colors for a reprint
§ Simulation of the printed product before the actual first print on press (proof)
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In the area of packaging, color is one of the most important factorsStudy: Johannes Gutenberg-Universität Mainz http://www.uni-mainz.de/presse/22982.php
§ Still a lot of processes are manual
§ Open questions on how to manage color over the whole process
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Color Management
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What is color management?
§ When we talk about Color Management:
§ Conversion (Custom profiles, Industry standard profiles like Gracol2013, etc.)
§ Standards (the standardized rule sets) – e.g. ISO 12647-2 for Offset
§ References & Print Characterization – (FOGRA 39L, custom characterization)
§ Proofing (Hard & Soft Proof)
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Color Management =Black Box?§ Which color profiles do we / our customer / supplier use?
(Proofprofiles, Separation Profiles, Normalization, ….)
§ How do we receive the files from the customer / agency / etc.?
§ What is the customer’s target?
§ Steps from final artwork until platemaking?§ Proofing§ PDF Conversion
§ Dot gain compensation
§ Just print it: What to consider on the press?
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How do you receive your files?
1. Converted or tagged with the correct profile
2. Always or mostlyconverted to GRACoL
3. Not color managed4. No Idea
German Office Pole Results1. 18% Converted or tagged
with profile2. 29% Always or mostly
converted to ISO Coated V2
3. 41% not color managed4. 12% no idea
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Color Management for what???
R G B
209 105 27 R G B
208 103 25
R G B
208 103 25
C M Y K
0 68 99 0
C M Y K
0 68 99 0
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Color Management for what???
R G B
209 105 27 C M Y K
3 64 100 19
C M Y K
5 68 99 24
R G B
211 94 29
R G B
216 94 26
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Conversion Profiles - ICC§ The „classical“ conversion consists of two steps:
source color space to L*a*b*, L*a*b* to target color space
R = 40G = 45B = 95
L = 24a = -1b = -41
Source: digital cameraR = 0G = 63B = 121
L = 24a = -1b = -41
Target: Screen
L = 24a = -1b = -41
C = 69M = 69Y = 8K = 27
Target: Newspapser
L*a*b*-color space as link between two profilesthe Profile Connection Space (PCS)
L = 24a = -1b = -41
C = 100M = 68Y = 7K = 31
Source: Litho
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DeviceLink profiles
§Direct color conversion from source to target
R = 40G = 45B = 95
Source: Camera
R = 0G = 63B = 121
Target: Screen
C = 99M = 69Y = 8K = 27
Target: Newspaper
Direct link between RGB to RGB or to CMYK, as well as CMYK to CMYK color values. The L*a*b* values are only used for informative reasons
C = 100M = 68Y = 7K = 31
Source: Litho
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CIELAB color space
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The CIE-L*a*b* model
§Device independent color space
L* = lightness; 0 - 100
b* = Blue – Yellow; -b - +b
a* = Green – Red; -a - +a
Thanks to a L*a*b*-coordinate a color could defined Using the DeltaE calculation the distance between two colors could get
described
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CIELAB color space
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Color Distances
§DeltaE76 vs. DeltaE2000
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Print Production
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Print Production
Design agency
Customer / brandowner
(bTasty)
Printshop
Platemaking Press
PrePress/Repro
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Print Production
Design agency
Customer / brandowner
(bTasty)
Final artwork
Printshop
Platemaking
Press
PrePress/Repro
Pictures, logos, text, …
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Print Production
Design agency
PrePress/ Repro
Customer / brandowner
(bTasty)
Printshop
Platemaking Press
Reproduction work
Color Proof
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Print Production
Design agency
PrePress/Repro
Customer / brandowner
(bTasty)
Printshop
Platemaking Press
Platesetter
Press
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Not that easy!
§ What's with:
Dot gain compensation Conversion Profiles
Proof Profiles
Press corrections
Customer´s target
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Two ways to consider color in the packaging print production- Manual Way -
Customer / AgencyPrePress
GRACoL2013 or others
Target Proof (GRACoL2013)
Proof(Custom profile)
File with manual corrections
Manual adjustment
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Two ways to consider color in the packaging print production- Professional Way -
Customer / AgencyPrePress
GRACoL2013 or others
File correct converted Conversion (Automation)
Normalization
Proof with correctprofile
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Deliver best color services
§ Define customer needs in case of color and the need of color management
§ Understand what is color management: Start with the camera end with the print production -> Knowledge based performance on the market
§ Be strong in communicating color and gain advantages
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Specialties in Packaging Printing
§Packaging printing is characterized by § High demands on quality§ Fast seasonal changes§ Different printing processes§ Different material and substrates§ Frequent usage of spot colors
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Variety of Materials§ Paper and Carton§ Corrugated Board§ Metal§ Labels§ Foil
§ transparent, white, metallic§ front or reverse
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Usage of Spot Colors
§Limited usage of spot colors in conventional printing§ CMYK + PANTONE 301 C
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Usage of Spot Colors
§Spot color separation in packaging printing§ CMY + P 469 C + P 301 C + P 248 C
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Biggest Challenge
§No standardization in packaging printing§Frequent usage of “Gracol2013 coated” profiled data
§ Works partly in Offset§ Only a CMYK standard without any specifications for spot colors
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Why is it a problem to use “Gracol2013” profiled data?
§Color space might be cropped§ Flexo and gravure printing offer more saturated inks
§Process characteristics might get lost§ Break in gradation of highlights in flexo printing§ Cell wall flooding in gravure printing§ Different TAC settings
§No trapping information inside
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Comparison GRACoL2013 to Flexo CMYK OPP
Flexo CMYK OPP
Gracol2013
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Individual standards
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Industry standard vs. custom standard
When to use an industry standard?
All defined parameters are within the ISO tolerances • à analyze the paper class, paper tint, printability,
printing inks
Sample: Printing on a Premium Coated paper with Printing Condition 1Defined paper tint (M1): 95 / 1 / -4 à Tolerance ±3 / ±2 / ±4
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Industry standard vs. custom standard
When to use an custom standard?
Printing process is not part of a industry standard
•4C - Offset / publication gravur: substrates that differ completely in printing behavior and papertint (special paper)
•Printing process differs completely e.g. Packaging in Flexo or Gravure printing with spot colors
Example: Flexible packaging printed in gravure 5 colors (Cyan replaced with Blue + additional color)
OPP foil
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Industry standard
vs. custom
standard
• When is a custom standard needed?• Printing process is not part of a industry standard
• 4C - Offset / publication gravur: substrates that differ completely in printing behavior and papertint (special paper)
• Printing process differs completely e.g. Packaging in Flexo or Gravure printing with spot colors
• Sample• Flexible packaging printed in gravure • 5 colors (Cyan replaced with Blue + additional color) • OPP foil
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What exactly is a print characterization?
§The representation of the entire print production process
§Therein all parameters and variations (with an ideal average)
§Reduced to the color resultTVI
Ink CTP
Varnish
Screen
Tempe-ratur Paper
RIP
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Preparation of the Fingerprint1. Testprint with linear plates
2. Definition of all printing parameters 3. Test form creation
4. Fingerprint + Evaluation of printing quality + Sheet selection
6. Measure the test charts
7. Evaluation and optimization of measurements
8. Finalization of characterization data 9. Documentation
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Steps to create a custom standard – Flexo printing
• 1. step: Testprint with linear plates• Inking series with different anilox rolls • Define the TVI• Define the “First Printing Dot”• Determine technical limitation (thin lines, small fonts)
• 2. step: Fingerprint with compensated plates • Testform with test charts and pictures • All parameters should correspond to later production
environment!
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Testform elements
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Fingerprint Testform
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Measure and evaluate the fingerprint
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Characterization
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How to Evaluate your Color Space
§Smoothness§Size
§Coverage of typical spot color library
§Comparison to industry standards (e.g. GRACoL)
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Profiles to be created
§ Proof profileto producecolor correctproofs
§ Separation profileto convert imagesinto target colorspace
Custom Flexo Standard
GRACoL2013
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Conversion
• Photoshop• Illustrator• ColorServer• PDF Editors (Hybrid PACKZ)
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Different gamuts§ Blue - sRGB
§ Coloured - ISO coated v2
§ Red Dots – Flexo CMYK OPP
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a
GRACoL2013Proof: Flexo CMYK OPP
Color conversion
sRGB
Flexo CMYK OPP ReverseSoftproof: Flexo CMYK OPP
a a
GRACoL2013Proof: GRACoL2013
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Selecting your tools for separation
§Gradients in Flexo need special attention
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Selecting your tools for separation
§Gradients in Flexo need special attention§Min dot§Highlight bump
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Selecting your tools for separation
§Gradients in Flexo need special attention§Min dot§Highlight bump
§Tools available, like§Adobe Plugins§Profiling tools
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K C M Y O G VA 45% 33% 96% - - - -
§Example Pantone 7650 C
2.1 ΔE
Ingredients:The content of this presentation is entirely developed, created and designed by myself and with some help from some others. If you read this here, I seem to be not interesting enough as a speaker to keep your attention for long. I’m sorry JBIX 0.0 ΔE
0.5 ΔE
8.9 ΔE
B 43% 34% 100% - - - -
C - - 100% - - - 77%
D 100%
p^jb=`lilo=Z=p^jb=pbm̂ o q̂flk\Color Accuracy vs. Printability
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How can I simulate my Color with other inks?
![Page 61: Print Production – From #COLOR19 Design to Print for Packaging · Print buyer wants § Best color match to his product § Identical colors between brochures, advert in newspaper,](https://reader033.vdocument.in/reader033/viewer/2022060409/5f102b757e708231d447ca06/html5/thumbnails/61.jpg)
Get ready for production
What has to be done?
![Page 62: Print Production – From #COLOR19 Design to Print for Packaging · Print buyer wants § Best color match to his product § Identical colors between brochures, advert in newspaper,](https://reader033.vdocument.in/reader033/viewer/2022060409/5f102b757e708231d447ca06/html5/thumbnails/62.jpg)
Next steps…
§ Raster Image Processor (RIP)§ Screening
§ Screen Ruling§ Angle§ Screen Type
§ DGC (dot gain compensation)§ Platemaking§ Mounting§ Printing
![Page 63: Print Production – From #COLOR19 Design to Print for Packaging · Print buyer wants § Best color match to his product § Identical colors between brochures, advert in newspaper,](https://reader033.vdocument.in/reader033/viewer/2022060409/5f102b757e708231d447ca06/html5/thumbnails/63.jpg)
Wherever a color goesit stays that color