1、Designation: E1708 95 (Reapproved 2007)E1708 14Standard Practice forElectronic Interchange of Color and Appearance Data1This standard is issued under the fixed designation E1708; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers procedures to be used in the electronic exchange of color and appearance data between use
3、rs, by eithermodem or the physical transfer of electronic media. It is intended for use by manufacturers of color-measuring instruments anddevelopers of software so that any instrument may acquire data for its use that may have been measured on an instrument ofanother manufacturer, at another place,
4、 or at another time.1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to u
5、se.2. Referenced Documents2.1 ASTM Standards:2E284 Terminology of Appearance2.2 ANSI Standard:CGATS.5 Graphic TechnologySpectral Measurement and Colorimetric Computation for Graphic Arts Images33. Terminology3.1 Definitions of terms in Terminology E284 are applicable to this practice.3.2 Definitions
6、 of Terms Specific to This Standard:3.2.1 data value identifier, na keyword that identifies the contents of a data field and, by definition, signals the data type ofthe field as string, integer, or floating point.3.2.2 keyword, nin electronic interchange, an alphanumeric designator that defines the
7、nature or number of following datafields.3.2.2.1 DiscussionThe word is used in its ordinary dictionary sense in Section 7.3.2.3 white space, na valid character representation that does not generate a printable character in a file.3.2.3.1 DiscussionValid ASCII white space characters are space (decima
8、l 32), carriage return (decimal 13), form feed (decimal 12), vertical tab(decimal 11), newline (decimal 10), and horizontal tab (decimal 9).4. Summary of Practice4.1 Users of this practice are given a mandatory list of keywords. The user fills out the list with the data values associated witheach ke
9、yword. The user may then select from an optional list of keywords. The user then associates with these keywords the datavalues required to be transmitted.1 This practice is under the jurisdiction of ASTM Committee E12 on Color and Appearance and is the direct responsibility of Subcommittee E12.04 on
10、 Color andAppearance Analysis.Current edition approved Aug. 1, 2007May 1, 2014. Published August 2007May 2014. Originally approved in 1995. Last previous edition approved in 20012007 as E1708 95 (2001).95 (2007). DOI: 10.1520/E1708-95R07.10.1520/E1708-14.2 For referencedASTM standards, visit theASTM
11、 website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indi
12、cation of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be c
13、onsidered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.2 The keywords are used at the receiving end of the transmission to decode the format and number of data values present inthe transmission.5. Significan
14、ce and Use5.1 This practice should be used by manufacturers of color-measuring instruments and developers of software when thetransmission of color and appearance data is desired between instruments or puters and where ASCII files are thedesired method of transfer.5.2 The method of transmission may
15、be via direct connection, modem, or the transfer of electronic media, for example, byfloppy disk transfer.5.3 The practice lends itself to the transmission of either a single record of data or multiple record files.5.4 Examples of files generated in this practice are contained in Fig. X1.1 and Fig.
16、X2.1 of theAppendix X1 appendixes.andAppendix X2.6. Procedure6.1 Prepare a file using ASCII code that consists of the mandatory keyword list followed by the associated data values. Eachkeyword and each data value is delimited by white space. The record may be organized into logical units associated
17、with eachkeyword by using the carriage return character for the white space delimiter at the end of the data values associated with anykeyword.6.1.1 Every keyword in the record must be followed by at least one character of white space as a delimiter. Do not precedekeywords on a line by other than wh
18、ite space. The exception to this recommendation, which is made to assist human readability,is the use of keywords as data value identifiers, which are listed in order on one line, if possible, so that they may be interpretedby the human reader as column headings.6.1.2 The specification of data value
19、 identifiers is entirely optional regarding the choice and number of identifiers. Data valueidentifiers are placed between the BEGIN_ DATA_FORMAT keyword and the END_DATA_ FORMAT keyword. Each data valueidentifier must be separated by at least one character of white space.6.2 Mandatory KeywordsThe f
20、ollowing keywords are mandatory in a record:6.2.1 E1708YYThe first seven characters in the file must be this keyword, where the digits YY are numeric for the year ofrevision of this practice that was used to formulate the record.6.2.2 ORIGINATORThe alphanumeric data value associated with this keywor
21、d is the specific system, organization, orindividual originating the record.6.2.3 DESCRIPTORThe alphanumeric data value associated with this keyword contains a description of the purpose orcontent of the record.6.2.4 CREATEDThe alphanumeric data value associated with this keyword contains the date o
22、n which the record was createdor the data measured.6.2.5 NUMBER_OF_FIELDSThe integer data value associated with this keyword contains the number of data formatidentifiers prescribed in the data format definition that follows.6.2.6 BEGIN_DATA_FORMATNo data value is associated with this keyword. The k
23、eyword identifies the beginning of thelist of data value identifiers.6.2.7 END_DATA_FORMATNo data value is associated with this keyword. The keyword identifies the end of the list of datavalue identifiers.6.2.8 NUMBER_OF_SETSThe integer data value associated with this keyword denotes the number of d
24、ata sets with theformat described by the list of data value identifiers.6.2.9 BEGIN_DATANo data value is associated with this keyword. The keyword marks the beginning of the data value listdefined by the data value identifier list and the NUMBER_OF_SETS of data keyword.6.2.10 END_DATANo data value i
25、s associated with this keyword. The keyword marks the end of the data list.6.3 Data Value IdentifiersThe following default data value identifiers are recognized by automated readers. The list containsthe data value identifier, followed by its data type, and finally a description of the contents of t
26、he data field associated with thedescriptor. The alphanumeric data type is indicated by CS. The integer data type is indicated by I. The floating point data type isindicated by F.6.3.1 SPECIMEN_ID, CSThis identifies the specimen that the data represent.NOTE 1This keyword represents an occurrence of
27、the incompatibility of ASTM keywords with keywords defined by CGATS.5. That standard usesSAMPLE_ID for this keyword. The term “sample” refers to a part taken to represent the whole. A specimen is an individual, or instance, taken from thesample that represents the whole.6.3.2 STRING, CSThis indicate
28、s that the field contains any alphanumeric value it may be necessary to transmit.This keywordis used to identify label information, lot number information, or other string values associated with the record.6.3.3 SPECTRAL_NM, IThis identifies the wavelength, in nm, of an associated data value.E1708 1
29、426.3.4 SPECTRAL_PC, FThis indicates that the associated data value is in units of percent reflectance or percenttransmittance.6.3.5 SPECTRAL_RT, FThis indicates that the associated data value is a spectral reflectance factor or spectral transmittancefactor.NOTE 2This keyword represents an occurrenc
30、e of the incompatibility of ASTM keywords with keywords defined by CGATS.5. That standard usesSPECTRAL_FR for reflectance and transmittance factors. The term “F(R)” is accepted routinely as representing Kubelka-Munk K/S in the Europeancolor community and in the analytical chemistry community worldwi
31、de. The keyword SPECTRAL_FR is thus adopted by ASTM to refer to thatparameter (see 6.5.5.5).6.3.6 SPECTRAL_RM, FThis indicates that the associated value is a spectroradiometric quantity.6.3.7 XYZ_X, FThis indicates that the associated data value is a CIE X tristimulus value.6.3.8 XYZ_Y, FThis is a C
32、IE Y tristimulus value.6.3.9 XYZ_Z, FThis is a CIE Z tristimulus value.6.3.10 XYY_CAPY, FThis is a CIE Y tristimulus value. This keyword is used as an alternative to XYZ_Y when the data arefurnished in chromaticity coordinates and luminance format.6.3.11 XYY_X, FThis is a CIE x chromaticity coordina
33、te.6.3.12 XYY_Y, FThis is a CIE y chromaticity coordinate.6.3.13 LAB_L, FThis is a CIE 1976 metric lightness value, L*.6.3.14 LAB_A, FThis is a CIE 1976 redness-greenness value, a*.6.3.15 LAB_B, FThis is a CIE 1976 yellowness-blueness value, b*.6.3.16 LAB_U, FThis is a CIE 1976 redness-greenness val
34、ue, u*.6.3.17 LAB_V, FThis is a CIE 1976 yellowness-blueness value, v*.6.3.18 LAB_C, FThis is a CIE 1976 metric chroma value, C*.6.3.19 LAB_H, FThis is a CIE 1976 a, b hue angle, hab.6.3.20 LAB_DE, FThis is a CIE 1976 metric color difference value, E*ab.6.4 Data ValuesData values must be formatted t
35、o correspond to the type of data called for by the keyword definition.6.4.1 Alphanumeric data must be enclosed by the character“ double-quote”character “double-quote” (decimal 34) at beginningand ending. The double-quote character embedded in a string is designated by two double-quotes (“”) in a row
36、, as is required byC language syntax. In this syntax, one double-quote is an element of the data, and the other is an indicator to the automated readerthat the occurrence of the character double-quote does not terminate the string in which the double-quote is embedded.6.4.2 It is not mandatory that
37、the data value associated with the keyword SPECIMEN_ID be enclosed by double-quotes unlessthe specimen data value contains white space.6.4.3 The integer data type is formed by combinations of the characters 0 through 9 inclusive, without decimal point oralphanumeric characters.6.4.4 The floating poi
38、nt data type should contain a decimal point. A decimal point will be assumed at the end of the numberrepresented if a floating point number fails to contain an explicit decimal point.6.4.5 Data values must be followed by at least one character of white space.6.4.6 In order to enhance human readabili
39、ty, data values may be placed on one line in order to form a table with the data valueidentifiers as implied headings.6.4.7 The carriage-return or newline should break the data stream into similarly formatted logical segments in order to enhancehuman readability.6.5 Optional Keywords and Data Format
40、 Identifiers The following keywords are optional for use.6.5.1 # (decimal 35)This character is used as the comment designator. It indicates to the automated reader that all charactersbetween it and the end of the line should be ignored. Its effect is terminated by a carriage-return or newline.6.5.2
41、KEYWORDThe use of this word as a keyword designates that the associated data value is to be treated as a user-definedkeyword, or data value identifier, for the rest of the file. The definition is not effective until encountered in the file and is operativeuntil the end of the file.6.5.2.1 The data v
42、alue associated with this keyword will itself become a defined keyword for the remainder of the file.Keywords must all be capital letters without white space. Consequently, the data values associated with this keyword must be socapitalized.6.5.2.2 The data value associated with this keyword must dec
43、lare the data type to be associated with its data from among thelist for alphanumeric (CS), integer (I), or floating-point (F).These type declarations must be the terminal characters of the keyword.6.5.3 The following optional keywords are defined further in CGATS.5. All of these keywords are data t
44、ype CS.MANUFACTURER PROD_DATE SERIALMATERIAL INSTRUMENTATION MEASUREMENT_SOURCEPRINT_CONDITIONS6.5.4 The following data value identifiers are further defined in CGATS.5 and are optional for use. All are data type F.E1708 143CMYK_C D_RED RGB_R STDEV_X STDEV_ACMYK_M D_GREEN RGB_G STDEV_Y STDEV_BCMYK_Y
45、 D_BLUE RGB_B STDEV_Z STDEV_DECMYK_K D_VIS STDEV_L6.5.5 The following data value identifiers are extensions beyond the scope of CGATS.5 and are optional for use.6.5.5.1 DDMMYY, CSDate in day, month, year format.6.5.5.2 MMDDYY, CSDate in month, day, year format.6.5.5.3 DTSC, CSDate time stamp for the
46、 latest calibration. The date is in DDMMYY format, followed by the time in 24 hfour-digit format.6.5.5.4 DTSR, CSDate time stamp for reading. The date and time are formatted as in 6.5.5.3.6.5.5.5 SPECTRAL_FR, FKubelka-Munk K/S values for single-constant colorant formulation.6.5.5.6 SPECTRAL_KA, FKub
47、elka-Munk absorption coefficients K for two-constant colorant formulation, or Beer-LambertLaw absorbance values A for use in transmission spectrophotometry.6.5.5.7 SPECTRAL_SC, FKubelka-Munk scattering coefficients for a two-constant colorant formulation.6.5.5.8 LAB_LUV, FA CIE 1976 metric color dif
48、ference value, E*uv.6.5.5.9 LAB_CMC, FA CMC-formula color difference value.7. Keywords7.1 data interchange; data transmission; spectral data interchange; spectral data transmissionE1708 144APPENDIXES(Nonmandatory Information)X1. EXAMPLE OF A SINGLE-RECORD FILEX1.1 An example of a single-record file,
49、 which transfers a set of tristimulus weighting factors, is shown in Fig. X1.1.FIG. X1.1 Single-Record FileE1708 145X2. EXAMPLE OF A FILE CONTAINING TWO RECORDSX2.1 An example of a file containing two records, which transfer spectral reflectance data associated with two measurements, isshown in Fig. X2.1.FIG. X2.1 File Containing Two RecordsE1708 146ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this
