iso 13655 measurement conditions€¦ · • p1 critical comparison: e.g. two prints: illuminance...
TRANSCRIPT
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ISO 13655 MEASUREMENT CONDITIONS
What they are and where they apply
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ISO STANDARDS FOR THE PRINTING INDUSTRY
ISO 3664:2009• Viewing conditions• D50/2º
ISO 5 Series:2009• Densitometry
ISO 13655:2009• Spectral Measurement and
Colorimetric Computation for Graphic Arts Images
• M-Standards introduced
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WHY MEASURE?
• Process setup• Process control• Print specification• Spot colour matching• Reporting• Independent reference• Easy to share
Better agreement between visual assessment and measurements
• Process setup• Process control• Print specification• Spot color matching• Reporting• Independent reference• Easy to share
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ISO 3664:2009 – VIEWING CONDITIONS
Light source• Relative spectral power distribution must match CIE illuminant D50
• UV energy must meet CIE illuminant D50 (correlates to M1 within ISO 13655)
Two levels of light intensity conditions• P1 Critical Comparison: e.g. two prints: illuminance 2000 ± 500 Lux
• P2 Practical Appraisal: less critical comparisons e.g. hardcopy to softproof: 500 ± 125 Lux or exact illuminance adjustment of lightbooth to monitor
Further definitions• Homogenity
• Surrounding: neutral gray diffuse surface
• Viewing angle to avoid glare
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WHAT IS WRONG IN THIS SCENE?
5
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THIS IS MUCH BETTER!
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PAPER FLUORESCENCE (OBAS)
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DIFFERENT LIGHTING CREATES DIFFERENT RESULTS
8
Daylight D
50A –
Tungsten
TL84 –R
etail StoreU
V only
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M194
3
-12
M0L* 94
a* 2,5
b* -9
REFLECTANCE OF PAPER WITH OBA
Different UV Content in Light or Measurement Mode -> Different Result
9
0
25
50
75
100
400 500 600 700Wavelength in nm
Ref
lect
ance
in
%
M294
0,5
-4
D50 - old - new - UVCut
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M195
-0,5
0
M0L* 95
a* -0,5
b* 0
M295
-0,5
0
400 500 600 700Wavelength in nm
Ref
lect
ance
in
%
D50 - old - new - UVCut
REFLECTANCE OF PAPER WITHOUT OBA
Different UV Content in Light or Measurement Mode -> Same Result
10
0
25
50
75
100
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WHAT’S NEW IN MEASUREMENT – ISO 5 SERIES
Density and Colorimetry requirements harmonized• For Graphic Arts all illuminants defined in 13655 allowed
Spectral Calculation methods defined for Status Density
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ISO 13655: 2009/2017 – MEASUREMENT CONDITIONS
Specifies spectral measurement conditions for graphic arts• Measurement geometry
• 0°/45° or 45°/0°• Backing
• Black Backing: Matte black substrate visual density 1.5 ± 0.2• White Backing: Matte white substrate w/o OBA,
• 2009: L* between 92 and 96, C* below 3• 2017: C* below 3 and spectral curve defines reflectance (effectively lowering high end of L*)
• Provides a mathematical formula for substrate compensation• Applies to press characterization, pressroom control, proof-print verification
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ISO 13655: 2009/2017 – MEASUREMENT CONDITIONS
Specifies spectral measurement conditions for graphic arts• Measurement illumination conditions
• M0: Should be CIE Illuminant A (many legacy spectrophotometers)• undefined UV amount• covers unknown illuminants as well
• M1: CIE Illuminant D50, 1 for paper (OBA) only• Part 1 is D50 match use for all fluorescence (ink, papers, etc)• Part 2 Calculated UV response to emulate UV excitation of OBA‘s (for paper only)
• M2: UV cut• Little energy below 420 nm, continuous illumination above
• M3: Polarization Filter with UV cut equal to M2• Special use cases
M0,M11,M2, M3 M0,M12,M2
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M3 – POLARIZATION
Colour Assessment independent of the surface• Polarization reduces reflections caused by the surface reflection or bronzing • On method of density comparison between wet and dry inks.• It also removes UV equivalent to M2.• Is used in ISO 12647 for as an option for density process control.
Attention: There is no viewing condition that matches this measurement condition
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M’S THE GRAPHS
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WHAT IT REALLY MEANS
Paper brighteners (OBA’s)
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EFFECT OF INK COVERAGE
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THE RIGHT MEASUREMENT MODE TO HIT THE TARGET
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QUICK REVIEW
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M0 - INCANDESCENT OR UNDEFINED
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M1 - D50 OR SOMETHING LIKE IT
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M2 – UV CUT, UV EXCLUDED, UV…
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M3 – POLARIZED (AND UV CUT)
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THANK YOU!