process control and benchmarking print 19 - color21 · 2019. 1. 4. · process control: the long...
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#COLOR19Process Control and
BenchmarkingRay Weiss, SGIA
Print, Measure and Verify
Process Control
Calibration
VerificationProcess Control
ICCProfile
Why Statistical Process Control?
Verifying Color Quality with Data using SPC
• Collect data
• Analyze data
• Speak with data
• Act with data
Reasons for Data Collection
• Identify problems
• Analyze problems
• Prevent problems
• Verify to customer
To Baseline Your Process…
Is theProcess
Predictable?
Can WeMeasure the
Process?
Is theProcess
Capable?
Key Points in Data Collection
• Convert data to pictorials• Collect right data• Automate data collection• Don’t collect data for
data’s sake• Not necessary to
measure everything
Automated InstrumentationSimplifies the Process
Data Collection Principles
§Go to the source
§See actual problem
§Talk to those involved
§Use data to verify problems
Determining Measurement Procedures§ What to measure?§ Why measure?§ What devices and/or
instruments are available?§ What are the specs?§ What tolerances?§ Who will do the
measurements?§ Is the importance understood?
§ Personnel training?§ How often to measure?§ How to record measurements?§ What to do with data?
Accuracy vs PrecisionPrecise,
but not AccurateAccurate,
but not PreciseAccurate, and
Precise
Hitting (Process Color) Industry Specifications: Accurate, and Precise
A Picture is Worth 1000 Words
Hitting (Process Color) Industry Specifications: Accurate, and Precise
Hitting (Spot Color) Specifications: Solids and Tints
• Typically Pantone LAB values are targets for solids
Hitting (Spot Color) Specifications: Solids and Tints
• Pantone LAB values are targets for solids
• Using a device, such as a Techkon, X-Rite eXact, or Barbieri SpectroPad
• ISO 20654:2017 (SCTVi) method for tints-- Calculated from the solid ink, substrate and one or more patches
Problem Solving with ProcessMore likely to:§Get to actual cause
§Find solution(s)
§Permanent
§More economical
Process Control: The Long View
§Trend report from Maxwell
§Note the printer goes well out of conformance in the June reading
Process Control: The Long View§Trend report from
ChromaChecker§Verifying i1 Pro2
device
Understand The Color Targets§What is the target?
- Characterization Reference Print Conditions (CRPC)
§Your own device as a target?§What is the Delta?
The CRPCs Color Gamut Comparison
Copyright © 2012 IDEAlliance / HutchColor
The CRPCs Color Gamut Comparison
Copyright © 2012 IDEAlliance / HutchColor
§Gamut map from ColorThink
§Wireframe is CRPC6 – good target?
§Solid is UV flat-bed printer with CMYK inks
Have a plan to hit the Color Targets
§Have a plan to get to the select color target(s)- The right software and instruments and a process
§Color Management Pyramid good option
Verify or Validate
§Verify or Validate that you have hit the target – and know when your device needs to be recalibrated or re-linearized.
