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rgb到xyz到lab色彩空间转换ppt(推荐文档).ppt

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RealizethecolorspaceconversionCIERGBtoCIEXYZtoCIELABColorimetryanditsempiricalfoundationsThereceptor-leveltheoryofcolormatchingThebipartitefieldusedincolormatchingexperiments.ColormatchingexperimentsTransformationbetweentwosetsofprimaries(RGBTOXYZ)LetR,G,Bbethetristimulusvaluesforthe(R),(G),(B)primariesandX,Y,Zbethetristimulusvaluesforthe(X),(Y),(Z)primaries.Theirchromaticitycoordinatesaredenotedbyr,g,bandx,y,z.Aswehavejustshown,thetransformationfromR,G,BtoX,Y,Zcanbedonebya3×3matrix,A:Fromtheequationandthedefinitionofchromaticity,wehaveX+Y+Z=(a11+a21+a31)R+(a12+a22+a32)G+(a13+a23+a33)B=(R+G+B)×[(a11+a21+a31)r+(a12+a22+a32)g+(a13+a23+a33)b]Fromtheequationwehavediscussed,Wecangettheconclusionthat:givenfourpairsofcorrespondingchromaticitycoordinatesinbothspaces,thetransformationcanbeuniquelydeterminedbysolvingasystemoflinearequationsineightunknowns.Alternatively,wecansolvethetransformationbyanotherAlgorithmThisalgorithmisfasterthantheprevious.0.4124CIELABcolorspaceBuilt-infunctionofmatlab