ASTM E1708-95(2001)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:E1708–95(Reapproved2001)
Standard Practice for
Electronic Interchange of Color and Appearance Data
This standard is issued under the fixed designation E 1708; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2.3.1 Discussion—ValidASCII white space characters are
space (decimal 32), carriage return (decimal 13), form feed
1.1 This practice covers procedures to be used in the
(decimal 12), vertical tab (decimal 11), newline (decimal 10),
electronic exchange of color and appearance data between
and horizontal tab (decimal 9).
users, by either modem or the physical transfer of electronic
media. It is intended for use by manufacturers of color-
4. Summary of Practice
measuring instruments and developers of software so that any
4.1 Users of this practice are given a mandatory list of
instrument may acquire data for its use that may have been
keywords. The user fills out the list with the data values
measured on an instrument of another manufacturer, at another
associated with each keyword. The user may then select from
place, or at another time.
an optional list of keywords. The user then associates with
1.2 This standard does not purport to address all of the
these keywords the data values required to be transmitted.
safety concerns, if any, associated with its use. It is the
4.2 The keywords are used at the receiving end of the
responsibility of the user of this standard to establish appro-
transmission to decode the format and number of data values
priate safety and health practices and determine the applica-
present in the transmission.
bility of regulatory limitations prior to use.
5. Significance and Use
2. Referenced Documents
5.1 This practice should be used by manufacturers of
2.1 ASTM Standards:
2 color-measuring instruments and developers of software when
E 284 Terminology of Appearance
the transmission of color and appearance data is desired
2.2 ANSI Standard:
between instruments or computers.
CGATS.5 GraphicTechnology—Spectral Measurement and
5.2 The method of transmission may be via direct connec-
Colorimetric Computation for Graphic Arts Images
tion, modem, or the transfer of electronic media, for example,
3. Terminology by floppy disk transfer.
5.3 The practice lends itself to the transmission of either a
3.1 Definitions—Definitions of terms in Terminology E 284
single record of data or multiple record files.
are applicable to this practice.
5.4 Examples of files generated in this practice are con-
3.2 Definitions of Terms Specific to This Standard:
tained in Fig. X1.1 and Fig. X2.1 of the appendixes.
3.2.1 data value identifier, n—a keyword that identifies the
contents of a data field and, by definition, signals the data type
6. Procedure
of the field as string, integer, or floating point.
6.1 Prepare a file using ASCII code that consists of the
3.2.2 keyword, n—in electronic interchange, an alphanu-
mandatorykeywordlistfollowedbytheassociateddatavalues.
mericdesignatorthatdefinesthenatureornumberoffollowing
Each keyword and each data value is delimited by white space.
data fields.
The record may be organized into logical units associated with
3.2.2.1 Discussion—The word is used in its ordinary dic-
each keyword by using the carriage return character for the
tionary sense in Section 7.
white space delimiter at the end of the data values associated
3.2.3 white space, n—a valid character representation that
with any keyword.
does not generate a printable character in a file.
6.1.1 Every keyword in the record must be followed by at
least one character of white space as a delimiter. Do not
This practice is under the jurisdiction of ASTM Committee E12 on Color and precede keywords on a line by other than white space. The
Appearance and is the direct responsibility of Subcommittee E12.04 on Color and
exception to this recommendation, which is made to assist
Appearance Analysis.
human readability, is the use of keywords as data value
Current edition approved May 15, 1995. Published July 1995.
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E1708–95 (2001)
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_FOR-
ated data value is in units of percent reflectance or percent
MAT 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
record.
European color community and in the analytical chemistry community
6.2.2 ORIGINATOR—The alphanumeric data value associ- worldwide. The keyword SPECTRAL_FR is thus adopted by ASTM to
refer to that parameter (see 6.5.5.5).
ated with this keyword is the specific system, organization, or
individual originating the record.
6.3.6 SPECTRAL_RM, F—This indicates that the associ-
6.2.3 DESCRIPTOR—The alphanumeric data value associ-
ated value is a spectroradiometric quantity.
ated with this keyword contains a description of the purpose or
6.3.7 XYZ_X, F—This indicates that the associated data
content of the record.
value is a CIE X tristimulus value.
6.2.4 CREATED—The alphanumeric data value associated
6.3.8 XYZ_Y, F—This is a CIE Y tristimulus value.
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 1976 metric lightness
6.2.7 END_DATA_FORMAT—No data value is associated
value, L*.
with this keyword.The keyword identifies the end of the list of
6.3.14 LAB_A, F—This is a CIE 1976 redness-greenness
data value identifiers.
value, a*.
6.2.8 NUMBER_OF_SETS—Th
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