1、Designation:D730508a(Reapproved 2013)Standard Test Method forReflection Density of Printed Matter1This standard is issued under the fixed designation D7305;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A n
2、umber in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method describes a procedure for measuringreflection density of printed matter using a reflection densitom-eter or spectrodensito
3、meter.1.2 This test method is intended primarily for process colors(yellow,magenta and cyan)and black.With appropriateinstrumentation,it may also be used for other colors.1.3 This test method applies to prints made by any printingprocess on a flat surface,with reflection density values rangingfrom j
4、ust above zero,on the unprinted substrate,through toaround 2.5 for very dense prints.1.4 This test method can be used for prints on paper,film orboard but not for those on metal or foil.It can be conducted inthe pressroom or laboratory.1.5 The values stated in SI units are to be regarded asstandard.
5、No other units of measurement are included in thisstandard.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bilit
6、y of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E284 Terminology of AppearanceE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ANSI Standards:3CGATS.4-1993 Graphic Technology Graphic Arts Reflec-tion Densitometry M
7、easurements Terminology,Equations,Image Elements and ProceduresCGATS.6 Graphic Technology Specifications for GraphicArts PrintingCGATS.11-1999 Graphic Technology Certified Refer-ence Materials for Reflection and Transmission Metrology Documentation Requirements and Recommended Pro-ceduresPH 2.17 Geo
8、metric Conditions for Reflection DensityPH 2.18 Spectral Conditions for the Measurement of OpticalDensity2.3 ISO Standard:3ISO 15790 Graphic technology and photography Certi-fied reference materials for reflection and transmissionmetrology Documentation and procedures for use,including determination
9、 of combined standard uncertainty2.4 Other Standard:3DIN 16536-2:1986 Testing of prints and printing inks ingraphic technology Colour density measurements onon-press or off-press prints3.Terminology3.1 Definitions related to appearance are in TerminologyE284.3.2 Definitions of Terms Specific to This
10、 Standard:3.2.1 reflection density,nthe light-absorbing property of amaterial,expressed as the logarithm of the reciprocal of thereflectance factor(i.e.higher density indicates more light isabsorbed).D=log10(1/R)=-log10(R)3.2.2 reflection densitometry,nthe practice of characteriz-ing the amount of l
11、ight absorption of materials by measuringreflectance and calculating and reporting reflection density.3.2.3 spectrodensitometer,na spectrophotometer with ap-propriate software to convert the measured reflectance valuesto reflection density.3.2.4 process color,na color having the main attribute ofabs
12、orbing approximately one-third(1/3)the visible spectrumand transmitting the other two-thirds(2/3).3.2.5 dry back,nthe reduction in density that occurs overtime after printing on paper and other absorbent substrates dueto ink penetration into the substrate.3.2.6 status T,nan ISO Reflection Status Den
13、sity.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.56 on Printing Inks.Current edition approved June 1,2013.Published July 2013.Originally approvedin 2008.Last previous edi
14、tion approved in 2008 as D7305 08a.DOI:10.1520/D7305-08AR13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Avail
15、able from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 NOTE1ISO R
16、eflection Status Density is defined by its SpectralProducts(Fig.1),that is,the wavelength by wavelength combination of astandard influx spectrum(CIE illuminant A)and the filter-modifed effluxspectrum.Originally,these modifiers were defined by combinations ofWratten filters but today,either more durable materials,such as glass areused or the Spectral Products are computed numerically from tables ofweights and the spectral reflectance factors measured with a spectroden-sitometer.The status T spect
