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1、imatest.comhttp://www.imatest.com/docs/multicharts/Imatest-MultichartsMeasurecoloraccuracy,tonalresponse,andnoisefromalargevarietyoftestchartsIntroductionColorcheckerIT8.7CMPDT003ColorcheckerSGQPcard201Q-13UniversalTestTarget(UTT)ChromaDuMonde28/28RAlso:SpyderCHECKR(8×6),SFRplus20-patchco
2、lor,SMPTE/HaleColorBars(6patches),TE226(9×5)chart,Generalmrowsxncolumns.Imatest™Multichartsanalyzesimagesofseveraltestchartsforcoloraccuracy,tonalresponse,noise,andISOsensitivityusingahighlyinteractiveuserinterface.Itcanbeusedtomeasurewhitebalanceandcolorresponseforawiderangeoflightingcon
3、ditionsandscenes.Itcanalsodisplaythetonalresponseofmonochromecharts(ormonochromeportionsofcolorcharts).Acolorcorrectionmatrixcanbecalculated(ImatestMasteronly)andusedtocorrectimages.Severalofthesupportedtestchartsareshownontheleft.TheChromaDuMonde,lineargrayscalestepcharts,UniversalTestTa
4、rget(UTT),andseveraladditionalSpecialChartsaresupportedbyImatestMasteronly.GettingstartedPhotographorscanthechart,takingcaretoilluminatethechartevenly(±5%),andtoavoidglare,whichcanbeproblematicinchartswithsemigloss(SG)andglossysurfacessuchasthereflectiveIT8.7andColorCheckerSG.Glarecanbees
5、peciallydifficulttocontrolwithwideanglelenses.Alow-costlightingsetupisdescribedhere.Fortestingwhitebalance,youcanphotographthechartinasceneunderavarietyoflightingconditions.TheminiColorCheckerisespeciallysuitableforthispurpose.Rectangularchartsmayberotatedbymultiplesof±90°iftheyaregeometr
6、icallysymmetrical(theseincludethetwoColorCheckers,theCMPDT003,QPCard01,andtheKodak/TiffenQ-13/Q-14,butnottheIT8.7(wheretopandbottomaredifferent).TostartMulticharts,runImatest,thenclickthebutton.TheMultichartswindowwillappearwithbriefinstructions,whichmaybemoreup-to-datethantheoneshownbelo
7、w.MultichartsopeningwindowwithbriefinstructionsSelectacharttoread.SelectacharttoanalyzebyclickingononeoftheentriesinthepopupmenubelowCharttypeorbyclickingonifthecorrectCharttypeisdisplayed.Thebuttonandpopupmenu(shownontheright)arehighlighted(yellowbackground)whenMul
