Improving Color MatchingUsing iccMAX - NPES › portals › 0 › pdf ›...
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ImprovingColorMatching UsingiccMAX
ChrisBai,ChiefColorScientist,BenQ Corporation
![Page 2: Improving Color MatchingUsing iccMAX - NPES › portals › 0 › pdf › PBOC2017ImprovingColor...2017/02/03 · Improving Color MatchingUsing iccMAX Chris Bai, Chief Color Scientist,](https://reader036.fdocuments.in/reader036/viewer/2022081406/5f1054547e708231d448926b/html5/thumbnails/2.jpg)
Overview
• WhatHappened?
• SomeMoreResearch…
• ThePlan
• Result
• Conclusion
• FutureWork
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WhatHappened?
• WhenBenQ 1st LEDbacklightcolormanagementmonitorwasannounced in2013.
• Veryexcitingnews!
• ExperiencedusersfoundoutLEDbacklightmonitordidnotperformedwellinsoftproofingscenario.
ExperiencedObserver
???
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Symptoms
• Variationsinblue,greenandpaleyellowtones,forexample.
• Differenceinperceivedsaturation.
LEDBacklightMonitor(Simulated)
ViewingBooth(Simulated)
Slighthueshiftinblue
Slighthueshiftingreen
Slighthueshiftinpaleyellow
Overallsaturationisdifferent
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WhatwasWrong?
• ΔE00* ismoreorlessthesame…
TestedwithIT8.7/41617Patches:• LEDMonitor:
• Avg.ΔE00* =1.25• Max.ΔE00* =4.35
• CCFLMonitor:• Avg.ΔE00* =1.20• Max.ΔE00* =4.25
Notmuchdifferencefromthevaluesalone.
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SomeMoreResearch…
• CIEReport* suggested:“Apotentialpracticalsolutionistoimplementanobserver-dependentcolorimagingworkflowatthedevicelevel.… Conceptuallythisissimilartothedevice-dependentcolorimaging,awell-establishedcolormanagementconcept.“
• Butnospectralcolormanagementworkflowwasestablishedatthattime.
• OnlyStandardObservercouldbeapplied.
*CIEFinalReportforR1-54:VariabilityInColor-MatchingFunctions
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ObserverVariations
*Y.Asano,MSCL,RIT,USAhttp://www.cis.rit.edu/~yxa8513/Research.html
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ThePlan
• TofindapotentialsolutionforLEDbacklightmonitors(andothernarrowbandwidthdisplaydevices).• Narrowbandwidthdisplaydevicesarebecomingextremelypopularoverthelast2years.
• TovalidateiccMAX frameworkinrealworldapplication.
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ExperimentFlow
ObtainIndividualCMF
IncorporateCMFintoDisplayPipeline
PairComparisonExperiment
HopeThisHelps…
SelectObservers12ppl,6Male&6Female,
25~40yearsold
ObtainDataPoints14patches,10° field,
7selections
Connectthe“Dots”Usinginterpretationmethodwith
CIECategorizedObserver
MeasureDisplaySPD’sCCFLv.s.LED
IncorporatingiccMAXDisplaySPD’s&CMF
ValidationTestOriginalPatchSet+TestSet
PracticalTest8 TestImages
MimicCCFLMonitor ImprovingColorMatching
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ColorPatchSelection
14Patches
*Y.Asano,MSCL,RIT,USAhttp://www.cis.rit.edu/~yxa8513/Research.html
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Categorization
• It’sverydifficultandtimeconsumingtoobtainindividual’sCMF.• Apparatusisalsoanotherdifficulty…
• UsedcategorizedmethodtodetermineCMF:• AssuggestedinCIEFinalReport*
• 14colorpatcheswereusedtodeterminefixeddatapoints
• Interpretationwasusedtoobtaintheintermediatedatapoints
*CIEFinalReportforR1-54:VariabilityInColor-MatchingFunctions
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Interface
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ExperimentSetup
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iccMAX Workflow
DestinationProfileB2D0Tag
SourceProfileD2B0Tag
CalibrationTarget:D65,160cd/m2,Gamma2.2
SpectralProfileConnectionSpace
ObserverCMF
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TestImages
TestImage1 TestImage2 TestImage3
TestImage5
TestImage4
TestImage6 TestImage7 TestImage8
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Result
TestImage1
BEFO
RE
No.ofAcceptable 7 9 3 4
No.ofUnacceptable 5 3 9 8
RateofAcceptable 58.3% 75.0% 25.0% 33.3%
AFTER
No.ofAcceptable 9 10 8 6
No.ofUnacceptable 3 2 4 6
RateofAcceptable 75.0% 83.3% 66.7% 50.0%
Improvement +16.7% +8.3% +41.7% +16.7%
TestImage2 TestImage3TestImage4
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ResultBE
FORE
No.ofAcceptable 4 8 6 5
No.ofUnacceptable 8 4 6 7
RateofAcceptable 33.3% 66.7% 50.0% 41.7%
AFTER
No.ofAcceptable 3 10 9 6
No.ofUnacceptable 9 2 3 6
RateofAcceptable 25.0% 83.3% 75.0% 50.0%
Improvement -8.3% +16.6% +25.0% +8.3%
TestImage5 TestImage6 TestImage7 TestImage8
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WhatDoImagesLookLikeforOneObserver?
Before
Original
After
TestIm
age1
Before
Original
After
TestIm
age2
Before
Original
After
TestIm
age3
Before
Original
After
TestIm
age4
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WhatDoImagesLookLikeforOneObserver?
Before
Original
After
TestIm
age5
Before
Original
After
TestIm
age6
Before
Original
After
TestIm
age7
Before
Original
After
TestIm
age8
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Conclusion
• ImprovementwasshownafterutilizingiccMAX workflow.• Blueandgreentones
• Saturatedcolors
• Someareastillneedsfurtherinvestigation:• Paleandlowbrightnesscolors
• Skintone
• Redtones
• Overall,withproperadjustment,iccMAX isthekeytosolveobservermetamerism onnarrowbandemissiondevices.
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FutureWork
1.Moreobserverswithdifferentage,ethicgroups,experiencelevel…
2. Incorporatemorewidegamutdisplayswithdifferentspectralcharacteristics:(Inprogress…)• QuantumDotTechnology
• LaserDiode+LEDTechnology(RedLaserDiode+CyanLED)
• OLED
3. ImprovementonCMFestimation:• ValidatecurrentCMFestimation.
• Abetterfittingalgorithmfor“connectingthedots”.
• Constructarobustandsimplifiedmethodtoestimateindividual’sCMF.
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FutureWork
4. Matchingtohardcopiesunderdifferentlightsourcetypes• Fluorescentlight
• LEDlight
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ThankYouforYourAttention