ASTM E1708-95(2007)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: E1708 − 95(Reapproved 2007)
Standard Practice for
Electronic Interchange of Color and Appearance Data
This standard is issued under the fixed designation E1708; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2.2.1 Discussion—The word is used in its ordinary dic-
tionary sense in Section 7.
1.1 This practice covers procedures to be used in the
3.2.3 white space, n—a valid character representation that
electronic exchange of color and appearance data between
does not generate a printable character in a file.
users, by either modem or the physical transfer of electronic
3.2.3.1 Discussion—ValidASCII white space characters are
media. It is intended for use by manufacturers of color-
space (decimal 32), carriage return (decimal 13), form feed
measuring instruments and developers of software so that any
(decimal 12), vertical tab (decimal 11), newline (decimal 10),
instrument may acquire data for its use that may have been
and horizontal tab (decimal 9).
measured on an instrument of another manufacturer, at another
place, or at another time.
4. Summary of Practice
1.2 This standard does not purport to address all of the
4.1 Users of this practice are given a mandatory list of
safety concerns, if any, associated with its use. It is the
keywords. The user fills out the list with the data values
responsibility of the user of this standard to establish appro-
associated with each keyword. The user may then select from
priate safety and health practices and determine the applica-
an optional list of keywords. The user then associates with
bility of regulatory limitations prior to use.
these keywords the data values required to be transmitted.
2. Referenced Documents
4.2 The keywords are used at the receiving end of the
2.1 ASTM Standards:
transmission to decode the format and number of data values
E284 Terminology of Appearance
present in the transmission.
2.2 ANSI Standard:
CGATS.5 Graphic Technology—Spectral Measurement and 5. Significance and Use
Colorimetric Computation for Graphic Arts Images
5.1 This practice should be used by manufacturers of
color-measuring instruments and developers of software when
3. Terminology
the transmission of color and appearance data is desired
3.1 DefinitionsoftermsinTerminologyE284areapplicable
between instruments or computers.
to this practice.
5.2 The method of transmission may be via direct
3.2 Definitions of Terms Specific to This Standard:
connection, modem, or the transfer of electronic media, for
3.2.1 data value identifier, n—a keyword that identifies the
example, by floppy disk transfer.
contents of a data field and, by definition, signals the data type
5.3 The practice lends itself to the transmission of either a
of the field as string, integer, or floating point.
single record of data or multiple record files.
3.2.2 keyword, n—in electronic interchange, an alphanu-
5.4 Examples of files generated in this practice are con-
mericdesignatorthatdefinesthenatureornumberoffollowing
tained in Fig. X1.1 and Fig. X2.1 of the appendixes.
data fields.
6. Procedure
This practice is under the jurisdiction of ASTM Committee E12 on Color and
6.1 Prepare a file using ASCII code that consists of the
Appearance and is the direct responsibility of Subcommittee E12.04 on Color and
Appearance Analysis.
mandatorykeywordlistfollowedbytheassociateddatavalues.
Current edition approved Aug. 1, 2007. Published August 2007. Originally
Each keyword and each data value is delimited by white space.
approved in 1995. Last previous edition approved in 2001 as E1708 – 95 (2001).
The record may be organized into logical units associated with
DOI: 10.1520/E1708-95R07.
each keyword by using the carriage return character for the
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
white space delimiter at the end of the data values associated
Standards volume information, refer to the standard’s Document Summary page on
with any keyword.
the ASTM website.
6.1.1 Every keyword in the record must be followed by at
AvailablefromNPES,TheAssociationforSuppliersofPrintingandPublishing
Technologies, 1899 Preston White Drive, Reston, VA 22091-4367. least one character of white space as a delimiter. Do not
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E1708 − 95 (2007)
taken from the sample that represents the whole.
precede keywords on a line by other than white space. The
exception to this recommendation, which is made to assist
6.3.2 STRING, CS—This indicates that the field contains
human readability, is the use of keywords as data value
any alphanumeric value it may be necessary to transmit. This
identifiers, which are listed in order on one line, if possible, so
keyword is used to identify label information, lot number
that they may be interpreted by the human reader as column
information, or other string values associated with the record.
headings.
6.3.3 SPECTRAL_NM, I—This identifies the wavelength,
6.1.2 The specification of data value identifiers is entirely
in nm, of an associated data value.
optional regarding the choice and number of identifiers. Data
6.3.4 SPECTRAL_PC, F—This indicates that the associ-
value identifiers are placed between the BEGIN_ DATA_
ated data value is in units of percent reflectance or percent
FORMAT keyword and the END_DATA_ FORMAT keyword.
transmittance.
Each data value identifier must be separated by at least one
6.3.5 SPECTRAL_RT,F—Thisindicatesthattheassociated
character of white space.
data value is a spectral reflectance factor or spectral transmit-
6.2 Mandatory Keywords—The following keywords are
tance factor.
mandatory in a record:
NOTE 2—This keyword represents an occurrence of the incompatibility
6.2.1 E1708YY—The first seven characters in the file must
of ASTM keywords with keywords defined by CGATS.5. That standard
be this keyword, where the digits YY are numeric for the year
uses SPECTRAL_FR for reflectance and transmittance factors. The term
of revision of this practice that was used to formulate the
“F(R)” is accepted routinely as representing Kubelka-Munk K/S in the
European color community and in the analytical chemistry community
record.
worldwide. The keyword SPECTRAL_FR is thus adopted by ASTM to
6.2.2 ORIGINATOR—The alphanumeric data value associ-
refer to that parameter (see 6.5.5.5).
ated with this keyword is the specific system, organization, or
6.3.6 SPECTRAL_RM, F—This indicates that the associ-
individual originating the record.
ated value is a spectroradiometric quantity.
6.2.3 DESCRIPTOR—The alphanumeric data value associ-
ated with this keyword contains a description of the purpose or 6.3.7 XYZ_X, F—This indicates that the associated data
value is a CIE X tristimulus value.
content of the record.
6.3.8 XYZ_Y, F—This is a CIE Y tristimulus value.
6.2.4 CREATED—The alphanumeric data value associated
with this keyword contains the date on which the record was
6.3.9 XYZ_Z, F—This is a CIE Z tristimulus value.
created or the data measured.
6.3.10 XYY_CAPY, F—This is a CIE Y tristimulus value.
6.2.5 NUMBER_OF_FIELDS—The integer data value as-
This keyword is used as an alternative to XYZ_Y when the
sociated with this keyword contains the number of data format
data are furnished in chromaticity coordinates and luminance
identifiers prescribed in the data format definition that follows.
format.
6.2.6 BEGIN_DATA_FORMAT—No data value is associ-
6.3.11 XYY_X,F—ThisisaCIExchromaticitycoordinate.
ated with this keyword. The keyword identifies the beginning
6.3.12 XYY_Y,F—ThisisaCIEychromaticitycoordinate.
of the list of data value identifiers.
6.3.13 LAB_L, F—This is a CIE 1
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