Etecting¬h-etamerismv – ALTANA Byko-Spectra Basic User Manual

Page 13

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$ETECTING¬h-ETAMERISMv¬

$ETECTING¬h-ETAMERISMv

7HEN¬TWO¬COLOR¬SAMPLES¬MATCH¬UNDER¬ONE¬LIGHT¬
SOURCE ¬BUT¬NOT¬UNDER¬ONE¬OR¬MORE¬OTHER¬LIGHT¬
SOURCES ¬THE¬hCOLOR MATCHv¬IS¬METAMERIC¬4HIS¬
MEANS¬THAT¬THE¬COLORANT¬FORMULATION¬IN¬ONE¬SAMPLE¬
DIFFERS¬FROM¬THE¬FORMULATION¬IN¬THE¬OTHER ¬RESULTING¬
IN¬DIFFERING¬SPECTRAL¬REmECTANCE¬FACTOR¬CURVE¬
SHAPES¬!¬METAMERIC¬COLOR¬MATCH¬CAN¬ALSO¬BE¬
REFERRED¬TO¬AS¬A¬hCONDITIONALv¬COLOR¬MATCH ¬SINCE¬
THE¬QUALITY¬OF¬THE¬COLOR¬MATCH¬IS¬CONDITIONAL¬TO¬THE¬
TYPE¬OF¬LIGHT¬SOURCE¬UNDER¬WHICH¬IT¬IS¬VIEWED
7HILE¬IT¬MAY¬NOT¬BE¬POSSIBLE ¬WITH¬THE¬COLORANTS¬
AVAILABLE ¬TO¬COMPLETELY¬ELIMINATE¬METAMERISM ¬
THE¬BYKO SPECTRA¬BASIC¬PROVIDES¬COLORISTS¬WITH¬
THE¬MEANS¬OF¬VISUALLY¬hINDEXINGv¬THE¬DEGREES¬OF¬
METAMERISM¬UNDER¬THREE¬SPECTRALLY¬DISSIMILAR¬LIGHT¬
SOURCES¬4HE¬FORMULATION¬MAY¬THEN¬BE¬ADJUSTED¬
TO¬PROVIDE¬THE¬hBEST¬MATCHv¬UNDER¬A¬SPECIlED¬
LIGHTING¬CONDITION ¬OR¬THE¬LEAST¬METAMERIC¬MATCH¬
UNDER¬ALL¬THREE¬LIGHTING¬CONDITIONS
&OR¬OBTAINING¬THE¬BEST¬CORRELATION¬WITH¬
INSTRUMENTAL¬MEASUREMENTS ¬CALCULATED¬COLOR¬
DIFFERENCES¬AND¬METAMERIC¬INDICES ¬THE¬SPECTRAL¬
POWER¬DISTRIBUTION¬OF¬THE¬SOURCES¬IN¬THE¬BOOTH¬
SHOULD¬BE¬USED¬IN¬THE¬COMPUTATIONS

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