colormetrix user group 2004
DESCRIPTION
ColorMetrix User Group 2004. Keynote presentation by Howard Nelson Ed.D ColorMetrix 4th Annual User Group Meeting August 8-10, 2004 • Las Vegas, Nevada. Print Measurement as Historical Eras. Decades in which projects were initiated (and perhaps continue to evolve) - PowerPoint PPT PresentationTRANSCRIPT
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ColorMetrixUser Group
2004
Keynote presentation by Howard Nelson Ed.D
ColorMetrix 4th Annual User Group Meeting
August 8-10, 2004 • Las Vegas, Nevada
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Print Measurement as Historical Eras
Decades in which projects were initiated (and perhaps continue to evolve)
Provides us with an overview of where we came from, so we might be able to predict where technology will take us next
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50 Years of Print Quality Verification
Measurement of printing through print characteristics
Print consistency controlPrint quality control
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LTF
Began researching lithographic technology during WW II for the US War Department
Began to research and consult for private industry after the War
Became GATF in the 1960’s
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Historically Speaking
The 1950’s were the research era Introduction of the scientific approach to
problem-solving LTF began to publish their findings in the
“popular trade-press” First densitometers became available
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Historically…
1960’s were the developmental era Web offset printing grabbed the market-
share for most impressions Densitometers became widely used GATF pioneered print characteristic
identification and calculation
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Historically
1970’s were the standardization era SNAP - 1970 - 1972 SWOP - 1976 - 1980 Color proofing systems introduced Print measurement investigates
ink/paper/chemistry relationships
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Historically
1980’s were a consolidation era CEPS systems improve halftone control Color proofing systems improved First Spectrophotometers available Print measurement data feeds back to
improve prepress accuracy
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Historically
1990’s were the era of verification No-proof editorial Spectrophotometers become generally
available ColorMetrix Technology LLC Press “Fingerprinting” for process control
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Press Fingerprinting
Five rules of Press Fingerprinting Simulate production Choose a test form Run the form Measure the sheets and collect data Feedback to prepress
A step beyond??
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Print Control Measurements
Solid Ink Density Dot Area Gain (at the 50% dot value)Print Contrast% Trap (for Wet Ink Trap)3/C Neutral Gray BalanceHue Error and Grayness Error
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Solid Ink Density
Makeready aimpoint for color approvalPrint consistency targetBasis reading for other calculationsOne of the main image contrast
indicators
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Dot Area Gain
Image contrast indicator
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Print Contrast
How well the press/ink/paper combination is able to render shadow detail by differentiating between shadow area tone values
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Wet Ink Trap
Control of secondary (RGB) colors
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Verification Fingerprinting
Monitoring “Sheet Contrast” At a given Solid Ink Coverage, print
contrast characteristics shouldn’t vary• C=1.30, M=1.40, Y=1.05, K=1.60• DG=20%, PC=40%, Trap
Fingerprinting to verify press components are functional
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Press Component Life
Like aircraft component parts, press parts are rated for useful life Plates & blankets by # of impressions Rollers by # of operating hours Even cylinder bearers are rated TBOoR
components
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Verification Fingerprinting
Run test form under “Press New” conditions
Discover and monitor TBOoR for press parts
Re-run test form to verify need for replacement
Watch sheet contrast for clues
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Scanable Press Test Form
The scanable presstest form
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Scanable Form Components
Two-tier standard color bar
Scanable color bar
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Scanable Form Components
Scanable ICC color profile
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Scanable Form Components
Scanable Tone Ramps
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Scanable Form Components
Scanable GrayBalance Ramps
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Scanable Form Components
Scanable Total Ink Coverage Ramps
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ColorMetrix
Collects and displays graphic dataDisplays Run with VOC tolerancesProcess TrendingColor hexagonPress fingerprintingData sharing with other programs
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Historically Speaking
2000 - 2010 may be the era of SPC Use of statistics to identify problems Use of statistics to monitor runs Using statistics to predict outcomes
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Six Sigma Data Analysis
Specifies the amount of variation experienced compared to the specs
Greater process predictability Lowers costs by minimizing waste and rework
Isolates special cause variation from common cause variation
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Descriptive Statistics
Mean The average of the data as collected
Standard Deviation The value of one sigma
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Run Chart
Note the value of each individual point Observe trends during the run
Runs up and down vs expected runs Observe the P-Value
P-Value for Clustering, P < .05 = Special Cause P-Value for Mixtures, P > .95 = Special Cause
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I-MR Chart
Individual Value of each data point of the run Mean, UNPL, LNPL
Moving Range of the differences in value during the run Average range, UNPL, LNPL
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Process Capability Analysis
The Cp index Ratio of the spec limits to the width of the process Cp = 2 means the process is stable Cp ≤ 1 means the process is unstable
The Cpk index Ratio of the process width to the spec width including
centering of the spec on the process Cpk > 1 means the process is capable of meeting spec Cpk = 1 or less means the process is incapable of meeting
spec
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Differences in Process Capability
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Some Words of Thanks
Colormetrix Technologies LLC Jim Raffel, Mike Litcher, Mike Woods
E. I. DuPont de NemoursGATF / PIA and Gretag-MacBethFlint Ink Corp.
Jeff Gilbert, Craig Stone