a metric to evaluate the closeness of the two colours · colours that give the similar impression....
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Ametrictoevaluatetheclosenessofthetwocolours
YasukiYamauchiYamagataUniversity
Referencecolourb*
a*
Selectedcolours
Task:"Findtheclosestcolouronaline(e.g.equalsaturaDon)"
Selectedcoloursarenotalwaysthecoloursofmin.ΔE
Coloursofmin.ΔE
CPRC1
CPRC7
ThesizeoftheColorGamutsaredifferent
CPRC1
CPRC7
Whenwewouldliketomapasourcecolortoacolorinagivengamut,weneedtofindthe"corresponding"color(=perceptuallyequal).
Sourcecolor
Closestcolors
AQercollecDngseveralclosestcoloursofdifferentgamuts:
Referencecolour
Trendofthecoloursselectedas"closest"tothereference
b*
a*ConsistentColors
Coloursthatgivethesimilarimpression
EvaluaDonofatestcolour:"howclosetothereferencecolour"
Referencecolourb*
a*
Hypothesis:Wedon'tcalculatethecolourdifferencedirectlybetweenatestandthereferenceEvaluatewiththedifferencefromthetrendoftheconsistentcolour?
Ametrictoevaluatehowcloseagivencolourtothereferencecolour
Referencecolourb*
a*
Findthecorrespondingtrendcolourandcalculateitsdifference(closeness)
Conceptofthecolordifferencebasedonconsistentcolorlocus
Step1:Findthetrendlines (consistentcolorloci)
Step2:Findthe"distance"ofatestcolor fromatrendline
Experiment
Gamutsusedintheexperiment
12targetcolors(references)
ConfiguraDonofthesDmulusTestcolorchangedalongthesurfaceofagivengamut
Consistentcolorloci (forCRPC7,CRPC5,andCRPC3)
b*
a*
Testcolor Referencecolor
1:Findthecorresponding"consistentcolor"
EvaluaDonofthecolor(1)
CRPC5CRPC3 CRPC7
SDmulusconfiguraDon
EvaluaDonofthecolor(2)
Howfaristhetestcolorsfromatrend-line