idealliance G7 Qualification Training

1. Master Qualification Basic Training
2020

2. G7 Master Qualification Basic Training
1. Idealliance (International Digital Enterprise Alliance) and the Value of G7
2. G7 Principles- Gray Balance & Tonality
3. G7 Target Conditions - Global Standards and Specifications
4. G7 Color Managed Workflows
5. G7 Process Control and Quality Assurance
6. Using G7 with Color Management – Expectations and Value
7. G7 Compliance & G7 Master Submission

3. Idealliance and the Value of G7:
Lesson 1

4. Idealliance International Affiliate Offices

5. Idealliance Today

6. G7® Empowering a Global Supply Chain

7. Brands Using G7® Requirements
Include…
G7® Adoption Snapshot
G7 Master Qualified Facilities
Include…

8. Education and Innovation
Creators of ISO Standards
in the World
Largest Certifying
Body in the World as
Measured by ISO
Most Recognized
Industry Training in
the World
12 Global Offices

9. G7 Master Qualification for Print Facilities
G7® Grayscale Compliance:
This is the fundamental level of G7. Regardless of printing technology, if we can ensure that a
printer or press prints the neutral tone ramp well, then all other colors will tend to fall into line
more easily.
G7® Targeted Compliance:
This is a secondary level of G7. G7 Targeted is achieved when G7 Grayscale is achieved.
The solid ink measurements for primaries and secondaries (KCMY and RGB) and substrate color
are also within spec to one of the G7-based TARGETED color spaces.
G7® Colorspace Compliance:
This is the third level of G7 compliance and the most stringent.
G7 Colorspace includes all the requirements of the G7 Targeted level (and therefore the G7
Grayscale level) adds the matching to an entire Reference Print Condition, E.G. IT8.7/4.

10. Idealliance G7 Programs
G7 Expert Certification
Individuals trained, tested, and authorized
by Idealliance to train G7 Masters
• Skilled, tested and proven leaders in print
production
• Users of global standards to match proof-to-
print
• Committed to reducing costs, speed to market
• Improve their client’s brand image

11. G7 Expert Certification
A G7 Expert has demonstrated expertise in the field of color management, process and quality control for proofing
and printing utilizing the G7 methodology & specification. A G7 Expert is able to analyze color and print related
issues and take corrective action to bring systems and processes in control to a set method, standard or
specification with repeatable, predictable results. A G7 Expert has attended and successfully completed an
Idealliance G7 Expert Training with a minimum level of 90% proficiency. Certification is valid for two years.
Individuals certified as a G7 Expert must hold individual, or be employed by an organization holding, Idealliance
membership. Recertification is required every two years. The G7 Expert must recertify by successfully completing
the Recertification Review & Exam within 90 days of certification expiration.

12. G7® Value and Benefits
• G7® is Idealliance’s industry-leading set of
specifications for achieving gray balance
• G7 achieves visual similarity across all print
processes.
G Represents Gray
7 Represents CMYK+RGB

13. G7® Shared Neutral Appearance
Offset
Digital Ink Jet
Before
After

14. G7® Technical Definition
• Defines a universal neutral appearance for printed
grays.
• Calibrates based on Tonality and Gray Balance
Offset Inkjet Flexo

15. G7® Leading Global Specification
Revised into ISO 12647-2
Pantone® Color Bridge is G7® calibrated
Used since 2006 by thousands and thousands
of printers globally
Specified by hundreds of major international
brands

16. • Customers expect consistent color
• Brand color requirements
• Across multiple presses and locations
• Reprinting same job or graphics
• One target regardless of device
• Proof to Press Match
• Customers expect consistent color
• Papers Agnostic
• Measurable, objective quality
G7® Value Print Service Providers
Consistency

17. G7® Value Print Service Providers
• Reduces make-ready time
• Reduces labor and waste
• All devices print to same target
Efficiency

18. G7® Value Brands
• Color consistency reinforces trust
• Color variation erodes brand loyalty
subconsciously
• Color is an essential part of brand loyalty
• Color is an emotional attribute of a brand
Consistency

19. G7® Value Supply Chain
• Simple data exchange to communicate
quality needs
• Concise expectations for acceptable color
• Aligns supply chain partners to the same
sheet of music
Communication

20. G7 Principles – Lesson 2

21. • Based on human visual perception
• Defines a universal “near neutral"
for the printed appearance of gray
• Single Color (black) vs. Multi Color (CMY)
• Controls
• TONALITY and
• GRAY BALANCE
What is G7?

22. • Defines a simple method for
calibrating CMYK printing devices.
• Simple, fast, one-step process to
calibrate any print system
• (Single Color (Black) to CMYK)
• Applicable across all CMYK print
technologies, inks and substrates
What is G7?

23. G7® Shared Neutral Appearance
Offset
Digital Ink Jet
Before
After

24. • G7 is a gray management system
• Managing gray balance & tonality using simple CMYK calibration
curves
• G7 is not a ”color management" system
• Complete color management requires G7 + additional color
management. Does not replace ICC Profiles, Process Control
• Tone reproduction improve when grays are correct
What is G7 NOT?

25. • Gray balance + tonality are controlled with
simple 1-D curves.
• G7 produces a shared neutral appearance on
all printing systems.
The G7 Method: Core Concept

26. • Achieving G7 Grayscale compliance with
CMYK (1-D) curves alone, and no extra color
management
• Individual (C+M+Y+K) curves can be imported
from external software (LUTs, DLPs, etc.) or
calculated by the printing system (Print Engine,
RIP, etc.)
The G7 Method: Core Concept Application

27. How is G7 Different?
Basics

28. • Based on Tonal Value Increase (TVI) of separate CMYK
ink scales
Dot Gain (TVI) calibration

29. Traditional Dot Gain (TVI) calibration achieves...
• With Standard Dot Gain Curves (TVI)
RIP Curves TVI Curves
+ =

30. • A color swatch can have the same TVI but different
tonality
50% black ink, 20% TVI
TVI does not compensate for tonality

31. • Any two swatches can have the same TVI, but vary in
appearance.
Example:
Dot Gain alone (TVI) does not control gray balance
CTVI = 18% MTVI = 18% YTVI = 18%

32. • Gray balance is also impacted by various other print
variation
Dot Gain alone (TVI) does not control gray balance
Green/blue “cool” caused by print variation : Trapping,
Sequence, Ink Hue, Paper?

33. TVI = Inconsistent Grays = Inconsistent Color
Digital Ink Jet Offset
Before
After

34. • G7 (gray balance) is calibrated on two major print
functions
What makes G7 different?
3 Color
Process
(CMY
only)
Black (K
only)
G7 TVI

35. G7 Calibration Creates…
+ = Gray balance (Near
Neutral)
• Repeatable tonality and gray balance
Tonality
LUT / RIP Curves

36. G7 controls grays without ICC profiles
Offset
Digital Ink Jet
Before
After

37. Neutral Print Density Curve
Tonality (NPDC)

38. • Neutral Print Density Curve
G7 NPDC: What is NDPC?
Neutral
Density
Gray Halftone dot % (CMY v K)

39. Origin of G7 Neutral Print Density (Tonality)
• G7 was developed as the ND vs. dot % of nine GRACoL
research print trials
Neutral Print
Density Curves

40. Adaptive Dynamic Range
Dynamic
Range
G7 Neutral Print Density Curves (NPDC) adapt
automatically to any device’s dynamic range

41. Gray Balance

42. • Defined CMY "triplets“
CMY Gray Balance percentages
25 19 19
50 40 40
75 66 66

43. a*G7 = a*paper
b*G7 = b*paper
x (1 – C/100)
x (1 – C/100)
G7 gray balance formula

44. Example: (paper = 2a* -6b*)
0.75 x 2 a* =
0.75 x -6 b* =
(1 – 25/100) = 0.75
1.5 a*
-4.5 b*
25c
LAB

45. Example: (paper = 2a* -6b*)
(1 – 50/100) = 0.50
1.0 a*
-3.0 b*
50c
0.5 x 2 a* =
0.5 x -6 b* =
LAB

46. Example: (paper = 2a* -6b*)
(1 – 75/100) = 0.25
0.25 x 2 a* =
0.25 x -6 b* =
0.5 a*
-1.5 b*
75c
LAB

47. Substate Relative Gray Balance with G7
Appearance of gray matches the substrate it is printed on
Cool Substrate Neutral White Point Warm Substrate
Example: Poly Film Example: Uncoated
Board

48. Target Conditions: Global Standards &
Specifications - Lesson 3

49. GRACoL® / SWOP®
CGATS.21 / ISO PAS 15339
Reference Print
Conditions

50. ISO/PAS 15339 CGATS.21*
• 7 Characterized Reference Print
Conditions (CRPCs) for multiple print
technology/applications
• Include Shared Relative Appearance
thanks to G7 and similar ink hue
angles

51. Seven CRPC’s – TARGET CONDITIONS
1
2 3 4
5
6
7
CRPC 1 cold-set news
CRPC 2 heat-set news
CRPC 3 quality uncoated
CRPC 4 pub super-calendared
CRPC 5 pub coated (SWOP 2013)
CRPC 6 commercial coated (GRACoL 2013)
CRPC 7 generic large-gamut

52. Color Managed Workflows – Lesson 4

53. • Stabilize the system.
• Produce a sample print. (No color management)
• Measure your calibration target. Ex. P2P
• Calculate RIP curves. By software or with formula (graph paper)
• Produce a second print with new RIP curves. (No color management)
• Check Results of Second Press Run.
• Create ICC (if needed).
G7 Calibration Steps

54. Automatic G7® Curve Calculation: Systems
• FUJIFILM ColorPath™ Sync®
• Heidelberg Prinect® Color Toolbox
• CHROMiX/HutchColor Curve2™ /
Curve3™ / Curve4™
• Alwan Dynamic Printer
Calibration™
• ColorGATE Productionserver
• Color CareTM v 2.2.1
• Caldera Print Standard Verifier G7
• Kodak ColorFlow Software
• EFI Fiery Color Profiler Suite v.4.9 /
v.5.0
• PRISMAsync Color Print Server for
Canon imagePRESS
• ORIS Lynx
• Bodini Systems pressSIGN 8
• AGFA PressTune 8
• Koenig & Bauer QualityPass 8
• PRISMAsync Color Print Server V6
/ V7
• ONYX Media Manager with G7
v18.5
• AGFAAsanti 4.2
• Mellow Colour PrintSpec 4Canon
Visit www.Idealliance.org for details

55. • Measured on P2P Columns 4 & 5
• Unit: Weighted Delta L* (w∆L*)
Neutral Print Density (NPDC) Accuracy
Target:
Avg: < 1.5
Max: < 3.0

56. • Column 5 (CMY only) on P2P
• Weighted Delta Ch (w∆Ch)
Gray Balance Accuracy with G7
Target:
Avg: < 1.5
Max: < 3.0

57. Weighting Function
1
0.75
0.5
0.25
0
0 25 50 75 100
• Reduces errors above 50% (shadows/less critical tones)
w∆ L*
∆ L*
(1max(0,(%50)500.75))
w∆ Ch ∆ Ch(1max(0,(%50)500.75))
Weighting

58. Evaluation Targets

59. • Idealliance ISO 12647-7 Strip on every proof
Proof Evaluation

60. • 3 Row Proof Verification Control Wedge (ISO 12647-7)
• Example: i1Pro or iSis
Proof Evaluation

61. • D50
• Defined by ISO 3664:2009
• The only ‘standard’ way to view color
• D50 is not the same as 5000K:
Proof Evaluation : Viewing Conditions

62. Process Control and Quality
Assurance – Lesson 5

63. Process Control
Aims
T
o Check NPDC Curves

64. Practical Evaluation of Press Sheet

65. HC Highlight Contrast – 25k or 25c, 19m, 19y
HR Highlight Range – 50k or 50c, 40m, 40y
SC Shadow Contrast – 75k or 75c, 66m, 66y
G7 Neutral Print Density Curves (NPDC)

66. Finding control patches in the P2P target
SC
75c 66m 66y
75k
HR
50c 40m 40y
50k
HC
25c 19m 19y
25k

67. Quick check of NPDC in mid-tones
50% gray ND relative to paper
Add paper ND to get target ND
HR_cmy = 0.54
HR_k = 0.50
Highlight Range (HR)

68. Evaluate NPDC in highlights
25% gray ND relative to paper
Add paper ND to get target ND
HC_cmy = 0.25
HC_k = 0.22
Highlight Contrast (HC)
25

69. Evaluate NPDC in shadows
75% gray ND relative to paper
Add paper ND to get target ND
SC_cmy = 0.90
SC_k = 0.90
(varies with DR)
Shadow Contrast (SC)
75

70. • HR and SC aims vary with tonal range (DR)
• But HC (25%) aims are constant
• (Same for all density ranges)
Target ND aims vary according to Tonal Range (density)

71. Using G7 with Color Management -
Lesson 6

72. • G7 doesn’t add extra work (in theory)
• All devices must be calibrated anyway
• For some work, G7 is enough without profiles
• G7 extends the life of a profile
• If the device drifts, G7 brings the gray scale back to how the profile
was made - less need to re-profile
Why profile & G7?

73. • G7 can improve the quality of ICC color management
• Does the heavy lifting of tonality and gray balance
• Lets the profile concentrate on subtle color accuracy
• G7 controls highlight detail better than ICC
• Due to limited precision of IT8.7/4 and other profiling targets
Why profile & G7?

74. • G7 reduces the need for re-profiling
• ICC profiling is slower, more expensive than calibration
• ICC profiling can be DANGEROUS
Why profile & G7?

75. • Color is subjective
• ALL printing systems vary to some extent
• A proof is a “simulation” of a perfect press
• Every press run is slightly different
• Evaluating “quality” is not an exact science
• Quality is proportional to price
Reality check

76.  An offset pressrun is a combination of science, skill and
luck
 Over 100 variables, only about 2 of which can be
controlled at press time
 Ink Jet printing is roughly 100x more stable than offset!
• That's why most proofing systems use ink jet
Printing is not an exact science

77. • ISO-standard papers are hard to find!!!
• Papers are bluer than ten years ago
• Paper color affects image color
• Don't expect a good proof simulation if you print on
non-standard paper
Non-standard papers

78. The effect of paper

79. • G7 does NOT guarantee perfect color
• Nothing does!
• G7 manages gray balance and tonality
• G7 does not compensate for…
• Inconsistent materials
• Unstable processes
• Color gamut limitations
• Bad printing
G7 Limitations

80. • Like any calibration method, G7 does not eliminate
printing variation
• For best results, measure more than one sheet to
minimize variations on the device
• Offset G7 calibration (and profiling) requires more than
one test.
•
Ideally, repeat the exercise 2 or 3 times and take the average
G7 Cautions (continued)

81. • CMYK+OGV
• Adds Orange, Green and Violet to
CMYK inks
• Commonly used in packaging
(mostly offset and flexo)
• XCMYK
• Extended gamut method for 4-
color (CMYK) inks
• Methodology, data set and
profiles released by Idealliance in
2016
Extended Gamut Print Strategies

82. • Offset or Flexo:
• Print CMYK inks to high densities on good paper
• Use FM screening to enhance pastels
• Calibrate to G7
• Digital
• Match the XCMYK profile (free at Idealliance.org)
XCMYK method

83. Compliance & G7 Master Submission -
Lesson 7

84. G7 Compliance Levels

85. G7 Master Compliance Levels
• G7 Grayscale
• G7 Targeted (Absolute or Relative)
• G7 Colorspace (Absolute or Relative)

86. G7 Grayscale Compliance
• G7 grayscale calibration
• Average w∆Ch:
• Maximum wCh:
• Average w∆L*:
• Maximum w∆L*:
< 1.5
< 3.0
< 1.5
< 3.0
• Minimum Level of Compliance
• Non-standard inks
*G7 Master Pass/Fail Requirements, Version 36, Aug 2019

87. G7 Targeted Compliance
• G7 Grayscale plus
• Inks match a defined CRPC
• ∆E00 ≤: CMY 3.5, K 5, RGB 4.2
• CRPC can be standard or custom
• (Send custom data with application)
• Example: G7-calibrated offset
• Standard Level of Compliance

88. G7 Colorspace Compliance
• Elite Level of Compliance
• G7 Targeted plus IT8.7/5 tolerances...
• Proofing:
≤ 1.5 ∆E00
≤ 1.5 ∆E00
≤ 3 ∆E00
≤ 5 ∆E00
• Substrate
• All patches average
• 95th percentile
• Maximum
• Press:
• Substrate
• All patches average
• 95th percentile
≤ 3 ∆E00
≤ 3.5 ∆E00
≤ 5 ∆E00

89. G7 Colorspace Compliance
• CRPC can be public (e.g. GRACoL) or custom*
*Custom submissions must include IT8.7/5 data
• Expected performance:
• Good neutral match
• Good solid color match
• Good pictorial color match

90. G7 Targeted & Colorspace - Relative
• Same as G7 Targeted or G7 Colorspace but utilized with
non-standard white point substrate
• Different color or lightness
• Ink solids are compared to the defined CRPC, modified
by "SCCA" (Substrate-Corrected Colorimetric Aims)
• NOTE: Highlights, Color, & Grays , colors and grays
shift towards substrate color and brightness

91. • ∆E < 1.5 = Excellent Proof
• ∆E < 2.0 = Average Proof
• ∆E < 3.0 = Average Press (offset)
• Average of all patches within a
characterization target
• IT8.7/5 (TC1617) / IT8.7/4
Typical Delta E tolerances : Proof & Press

92. • On-site training requirements
• Supported by online tutorials and other material
• Affidavit signed by Expert and Master employee
• Samples must be produced by employee, not Expert
G7 Master procedures summary
Requirements Affidavit Samples

93. • Each device aims for a named compliance level:
• Grayscale, Targeted, or Colorspace
•
• Print samples must contain latest QR code
• www.idealliance.org - changes quarterly
G7 Master print samples
G7 sample prints must be made by the
Master employee, not the Expert

94.  Recommended:
• G7 Verifier
 Also accepted:
• P2P51 or P2P25
Sample targets - G7 Grayscale & Targeted

95. •
•
•
Sample targets - G7 Colorspace
• Recommended:
• TC1617, IT8.7/5
• Also accepted:
• G7 Verifier or P2P51 or P2P25 + IT8.7/4
+
or or

96. G7 Master affidavit

97. All the best for your Master certification
Learn more about G7® at
www.idealliance.org/G7
ISHANT KALKAL *G7 Expert - (Pre-sales Manager) RSG Solutions Pvt. Ltd. New Delhi
E-Mail Address – ishant.Kalkal@rsgsolutions.co.in / Mobile - +919310196639