Designation:D7305−08a(Reapproved2020)StandardTestMethodforReflectionDensityofPrintedMatter1ThisstandardisissuedunderthefixeddesignationD7305;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddescribesaprocedureformeasuringreflectiondensityofprintedmatterusingareflectiondensitom-eterorspectrodensitometer.1.2Thistestmethodisintendedprimarilyforprocesscolors(yellow,magentaandcyan)andblack.Withappropriateinstrumentation,itmayalsobeusedforothercolors.1.3Thistestmethodappliestoprintsmadebyanyprintingprocessonaflatsurface,withreflectiondensityvaluesrangingfromjustabovezero,ontheunprintedsubstrate,throughtoaround2.5forverydenseprints.1.4Thistestmethodcanbeusedforprintsonpaper,filmorboardbutnotforthoseonmetalorfoil.Itcanbeconductedinthepressroomorlaboratory.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.7Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2E284TerminologyofAppearanceE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod2.2ANSIStandards:3CGATS.4-1993GraphicTechnology–GraphicArtsReflec-tionDensitometryMeasurements—Terminology,Equations,ImageElementsandProceduresCGATS.6GraphicTechnology—SpecificationsforGraphicArtsPrintingCGAT...
