ISO 10756:1994

INTERNATIONAL ISO
STANDARD 10756
First edition
1994-07-01
Graphit technology - Prepress digital
Colour line art data on
data exchange -
magnetic tape
Technologie graphique - khange de donndes digitales de
preimpression - Donnees de Eigne d ’art couleur sur bande magn6tique
Reference number
ISO 10756:1994(E)

---------------------- Page: 1 ----------------------
ISO 10756:1994(E)
Contents
Page
1
1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .~.
1
2 Conformance . . . . . . . . . . . . . . . . . . . . . . . .*.
1
3 Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*.*.
1
4 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*.
2
.......................................................
5 Symbols and abbreviations
2
6 Requirements .
2
. Basic requirement .
61
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
62 . DDESOO tapes
2
63 . EUEF formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
64 . Non-UEF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
,,. 3
65 . Specifying UEF, EUEF and non-UEF formats
3
. Padding of fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
66
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
67 . Utilization of User Header Labels
3
l Intermixing tape formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
68
7 Header Labels for DDESOO
. . . . . . . . . . . . . . . . . . . . . . .~.
71 . General tape format
6
. . . . . . . . . . . . . . . . . . . . . . .*.
72 . Header labels
12
73 . Data structure . . . . . . . . . . . . . . .*.
17
8 Trailer Labels for DDESOO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . 17
81 . End of File Labels and End of Volume Labels
17
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2 User Trailer Labels
0 ISO 1994
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronie or mechanical, including photocopying and
microfilm, without Permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-l 211 Geneve 20 l Switzerland
Printed in Switzerland

---------------------- Page: 2 ----------------------
0 ISO ISO 10756:1994(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide
federation of national Standards bodies (ISO member bodies). The work
of preparing International Standards is normally carried out through ISO
technical committees. Esch member body interested in a subject for
which a technical committee has been established has the right to be
represented on that committee. International organizations, governmental
and non-governmental, in liaison with ISO, also take part in the work. ISO
collaborates closely with the International Electrotechnical Commission
(1 EC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard ISO 10756 was prepared by the American National
Standards Institute (as ANSI IT8.2.1988) and was adopted, under a special
“fast-track procedure ”, by Technical Committee lSO/TC 130, Graphit
technology, in parallel with its approval by the ISO member bodies.
. . .
Ill

---------------------- Page: 3 ----------------------
0 ISO
ISO 10756:1994(E)
Introduction
The technical content of this International Standard is identical to American
National Standard IT8.2-1988. The ANSI document was circulated for ISO
approval as a fast track document at the request of the 1989 plenary
meeting of lSO/rC130 and subsequent to its approval was restructured to
be in accordance with patt 3 of the lSO/IEC Directives. IT8.2 itself resulted
from the joint efforts of an international industry group that included par-
ticipants representing all of the major prepress vendors in the world. This
group, initially identified as the DDES (Digital Data Exchange Specification)
Committee, later became the founders of the ANSI IT8 (Image Tech-
nology) accredited Standards committee which is responsible for elec-
tronic data exchange Standards in graphic arts prepress.
The data formats are modelled on ISO 10755.

---------------------- Page: 4 ----------------------
ISO 10756:1994(E)
INTERNATIONAL STANDARD 0 ISO
- Prepress digital data
Graphit technology
- Colour line art data on magnetic tape
exchange
1 Scope
This International Standard specifies a format for magnetic tape that will enable colour line art data transfer be-
tween colour electronie prepress Systems manufactured by different vendors.
2 Conformance
A DDES implementation shall be in conformance with this International Standard if it meets the requirements of
those requirements specifically identified as non-UEF and EUEF. Non-UEF and EUEF, if
clauses 6 to 8 excepting
used, shall be written as specified but are optionally read.
3 Normative references
The following Standards contain provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the editions indicated were valid. All Standards are subject to
revision, and Parties to agreements based on this International Standard are encouraged to investigate the possi-
bility of applying the most recent editions of the Standards indicated below. Members of ISO and IEC maintain
registers of currently valid International Standards.
ISO/1 EC 646: 1991, Information technology - ISO 7-bit coded Character set for information interchange
ISO 1001: 1986, Information processing - File structure and labelling of magnetic tapes for information inter-
Change
Unrecorded 12,7 mm (0,5 in) wide magnetic tape for information
ISO/1 EC 1864: 1992, Information technology -
in terchange - 32 ftpmm (800 ftpi), NRZ?, 126 ftpmm
(3 200 ftpi) Phase encoded and 356 ftpmm (9 042 ftpi),
NRZl
I SO/I EC 3788: 1990, Information processing - 9=track, 12,7 mm (0,5 in) wide magnetic tape for information inter-
Change using Phase encoding at 126 ftpmm (3 200 ftpi), 63 cpmm (1 600 cpi)
g-Track, 12,7 mm (0.5 in) wide magnetic tape for information inter-
ISO 5652: 1984, Information processing -
Change - Format and recording, using group coding at 246 cpmm (6 250 cpi)
4 Definitions
For the purposes of this International Standard, the following definitions apply.
4.1 Digital Data Exchange Specification (DDES): A method of sharing digitally encoded information between
cooperating Systems.
1

---------------------- Page: 5 ----------------------
0 ISO
ISO 10756:1994(E)
4.2 User Exchange Format (UEF): The basic features that a System should implement to be in accordance with
this International Standard.
4.3 Extended User Exchange Format (EUEF): Optional features that a System may implement in addition to the
UEF features.
4.4 non-UEF: Vendor-specific capabilities not defined in this International Standard.
4.5 decimal Point notation: The expression of a decimal number in a numeric field as a string of numeric
characters (lSO/IEC 646 positions 3/0 to 3/9), with optional decimal Point (lSO/IEC 646 Position 2114 - full stop).
5 Symbols and abbreviations
The following Symbols and abbreviations are used in this International Standard.
BP Byte Position within a label. For ease of use with ISO 1001, byte positions statt at 1.
L Length of field in number of byte positions.
SPACE or tj The Character coded in Position 2/0 of ISO/IEC 646.
ZERO The Character coded in Position 3/0 of lSO/IEC 646.
h
Hexadecimal numbers are identified by the digits 0 to 9 and the Ietters A to F followed by a lower
case “h” (e.g. 3F6Ah).
6 Requirements
6.1 Basic requirement
UEF version 01 is the basic requirement for exchange of colour line art. The line art data to be interchanged under
UEF version 01 shall consist of a rectangular array of picture elements (Pixels), each of which holds one of a limited
number of colours. The colours shall be defined in a colour Palette table, which specifies the values of the colour
Separation components for each entry in the Palette.
NOTE 1 The line art image is further characterized by having continuous areas of many Pixels of the same Palette entry, and
not simulating a greater range of colours by “dithering” or “error diffusion” techniques. The spatial information is therefore
amenable to run length encoding techniques, which may reduce file size and allow for faster processing. As a clarification,
consider a line art file as characterized by a limited number of colours out of a larger domain, raster data rather than geometric
description data, a rectangular array, and no Object placement information. Image placement information is neither assumed
nor implied by this specification.
6.2 DDESOO tapes
When the tape is identified as DDES (BP 44-47) version 00 (BP 50-51) in the Volume 1 Header, then the tape shall
be written as specified in this International Standard. No other values are permitted in UEF or EUEF fields. The
only fields available for nonprescribed use are the fields with contents “reserved for System use (vendor use)” and
vendor UHLs (BP 04-80). All other fields shall be written either as described in this International Standard or as in
ISO 1001.
Where fields are not defined in this International Standard, ISO 1001 shall be used.
DDES tapes shall be written at 1 600 bpi Phase encoded or 6 250 bpi GCR, in accordance with lSO/IEC 3788 or
ISO 5652 respectively, on media as specified in lSO/IEC 1864.
6.3 EUEF formats
Use of the extended implementation EUEF fields and values is optional. However, only those Codes specified in
this International Standard shall be used.
2

---------------------- Page: 6 ----------------------
!
0 ISO ISO 10756:1994(E)
6.4 Non-UEF
Non-UEF fields and values are also to be specified within DDES. These fields and values shall be restricted in use
in the same manner as EUEF fields and values.
6.5 Specifying UEF, EUEF and non-UEF formats
BP 05-10 of UHLI shall be used as the UEF indicator. This field shall be coded as indicated in 7.2.4.
6.6 Padding of fields
I be left-a ligned and
Any numeric fields shall be right-aligned and ZERO padded, and any alphanumeric fields shal
padded with SPACEs.
6.7 Utilization of User Header Labels
UHLI, UHL2, UHL3 and UHL4 are currently specified in this International Standard. Up to 25 additional UHLs are
reserved for use in UHL2: up to seven additional for future DDES use (BP 31)’ up to nine for other future use
(BP 32)’ and up to nine for vendor use (BP 33). DDES UHL values (BP 04) shall be unique and in Order. The values
‘IA” and “B” shall be reserved for DDES use.
“1 ” to “9”’
6.8 Intermixing tape formats
Different UEF magnetic tape file formats may be found on the same DDES tape and/or volume set. A DDES
magnetic tape may also contain EUEF as weil as non-UEF file formats.
7 Header Labels for DDESOO
The following subclauses describe the DDES use of ISO 1001 tape format.
7.1 General tape format
Table 1 gives the format for two line art files on one tape. Table2 gives the format for two line art files on two
tapes. This International Standard supports multiple tapes in a file set as described in HDRl, including the splitting
of a line art file over multiple tapes.

---------------------- Page: 7 ----------------------
0 ISO
ISO 10756:1994(E)
Table 1 - Format for two line art files on one tape
2 of the following file
abel
User Header Label 3 of the following file
User Header Label 4 of the following file
Additional UHLs may be specified in
UHLZ (BP 31-33)
LINE ART FILE 1
Logical tape mark
End of File Label 1
End of File Label 2
User Trailer Label 1
User Trailer Label 2
User Trailer Label 3
User Trailer Label 4
A UTL for each UHL is to be included on the tape. These are not
er Label 2 of the following file
User Header Label 3 of the following file
User Header Label 4 of the following file
TM Logical tape mark
****
LINE ART FILE 2
line art data
TM Logical tape mark
EOFl End of File Label 1
End of File Label 2
EOF2
UTLl User Trailer Label 1
UTL2 User Trailer Label 2
UTL3 User Trailer Label 3
User Trailer Label 4
UTL4
*
*
*
TM Logical tape mark
TM Logical tape mark (logical end of tape)
EOT Physical tape mark (end of tape)

---------------------- Page: 8 ----------------------
ISO 10756:1994(E)
0 ISO
Table 2 - Format for two line art files on two tapes
First Tape
BOT Physical tape mark (beginning of tape)
VOL1 Volume Header Label
File Header Label 1 of the following file
HDRl
HDR2 File Header Label 2 of the following file
UHLI User Header Label 1 of the following file
UHL2 User Header Label 2 of the following file
UHL3 User Header Label 3 of the following file
UHL4 User Header Label 4 of the following file
*
*
*
TM Logical tape mark
****
LINE ART FILE 1
line art data
TM Logical tape mark
EOFI End of File Label 1
EOF2 End of File Label 2
UTLl User Trailer Label 1
UTL2 User Trailer Label 2
UTL3 User Trailer Label 3
UTL4 User Trailer Label 4
+
*
*
TM Logical tape mark
HDRl File Header Label 1 of the following file section
File Header Label 2 of the following file section
HDR2
User Header Label 1 of the following file section
UHLI
UHL2 User Header Label 2 of the following file section
User Header Label 3 of the following file section
UHL3
User Header Label 4 of the following file section
UHL4
u
*
*
TM Logical tape mark
LINE ART FILE 2
****
line art data
- Section 1
EOT Physical tape mark (end of tape)
TM Logical tape mark
EOVl End of Volume Label 1
EOV2 End of Volume Label 2
UTLl User Trailer Label 1
UTL2 User Trailer Label 2
UTL3 User Trailer Label 3
UTL4 User Trailer Label 4
+
+
*
TM Logical tape mark
TM Logical tape mark (logical end of tape)

---------------------- Page: 9 ----------------------
0 ISO
ISO 10756:1994(E)
Second Tape
BOT Physical tape mark (beginning of tape)
VOL1 Volume Header Label
HDRI File Header Label 1 of the following file section
HDR2 File Header Label 2 of the following file section
UHLl User Header Label 1 of the preceding file section
UHL2 User Header Label 2 of the preceding file section
UHL3 User Header Label 3 of the preceding file section
UHL4 User Header Label 4 of the preceding file section
*
TM Logical tape mark
LINE ART FILE 2
****
line art data
- Section 2
TM Logical tape mark
EOFl End of File Label 1
EOF2 End of File Label 2
UTLl User Trailer Label 1
UTL2 User Trailer Label 2
User Trailer Label 3
UTL3
UTL4 User Trailer Label 4
*
*
*
TM Logical tape mark
Logical tape mark (logical end of tape)
TM
EOT Physical tape mark (end of tape)
72 . Header labels
The following subclauses specify the Header Labels for DDESOO UEFOI tapes. There shall be no optional formats
or fields in DDESOO except as specified.
7.2.1 Volume 1 Header (VOLl)
Table3 gives byte position, field name, length in bytes, and content for the Volume 1 Header.
The sequence number of tapes in a volume set shall Start with “01” and be incremented by 1 for each tape in the
set as specified in BP 48-49.
Table 3 - Volume 1 Header (VOLl)
L Content
BP Field name
,
01-04 label identifier and number 4 “VOL1 ”
05-10 volume identifier 6
11 volume accessibility 1 SPACE
12-37 reserved for ISO 1001 use 26 SPACEs
38-43 creation date (ISO 1001 format) 6
44-47 DDES identifier 4 ” DDES”
48-49 sequence number of tape in volume set 2
50-51 DDES version 2 ” 00 ”
52-79 reserved for ISO 1001 use 28 SPACEs
80 label Standard Version 1

---------------------- Page: 10 ----------------------
Q ISO
ISO 10756:1994(E)
7.2.2 File Header Label 1 (HDRl)
Table 4 gives byte Position, field name, length in bytes and content for File Header Label 1 l
The contents of file identifier (BP 05-21), generation number (BP 36-39) and generation version number (BP 40-41)
tan be different between different operating Systems. These fields are not intended for use in intervendor Systems
communication.
The file set identifier (BP 22-27) does not contain a job name for DDES. The job name shall be contained in the
User Header Label 1 (see table6).
When the date is not defined, SPACE followed by five ZEROS or, alternatively, six ZEROS shall be used (see
BP 48-53 in table4).
Table 4 - File Header Label 1 (HDRl)
BP Field name L Content
01-04 label identifier and number 4 “HDRl “
05-21 file identifier 17
22-27 file set identifier 6
28-31 file section number 4
32-35 file sequence number 4
36-39 generation number 4
40-41 generation version number 2
42-47 file creation date 6
48-53 file expiration date (optional) 6
54 file accessibility 1 SPACE
55-60 block count 6 ZEROS
61-73 reserved for System use (vendor use) 13
74-80 reserved for ISO 1001 use 7 SPACEs
7.2.3 File Header Label 2 (HDR2)
Table 5 gives byte Position, field name, length in bytes and content for File Header Label 2.
BP 16-50 (System use/vendor use) shall be for individual use of the vendors and not for intervendor Systems
communication.
Table 5 - File Header Label 2 (HDR2)
BP Field name L Content
01-04 4
label identifier and number “HDR2“
05 1
record format = fixed length “F“
06-10 block length (fixed for UEF) 5 "08192"
11-15
record length (fixed for UEF) 5 "08192"
16-50 reserved for System use (vendor use) 35
51-52
buffer offset length 2 ZEROS
53-80 reserved for ISO 1001 use
28 SPACEs

---------------------- Page: 11 ----------------------
0 ISO
ISO 10756:1994(E)
7.2.4 User Header Label 1 (UHLl)
Table 6 gives byte position, field name, length in bytes and content for User Header Label 1.
BP 05-10 shall be the UEF indicator as follows:
“UEFtjOl“ - User Exchange Format for colour line art
“EUEFOl“ - Extended UEF file
“bbbbO1“ - non-UEF file
All other nomenclature shall be reserved for future DDES use.
BP 11-30 shall be reserved for the name of the equipment vendor sending the tape. A different vendor name
should be used by each vendor.
Table 6 - User Header Label 1 (UHLl)
Field name L Content
BP
I
4 ” UHLl “
01-04 label identifier and number
6 “UEFbOl“
05-10 UEF indicator
20
11-30 vendor name
10
31-40 program name
20
41-60 job name
20
61-80 picture name
7.2.5 User Header Label 2 (UHL2)
Table 7 gives byte position, field name, length in bytes and content for User Header Label 2.
BP 25-28 specify the type of file on the tape as follows:
Standard types:
I’ 0000 “ - colour picture (reserved for other DDES use)
t’oool “ - line art (UEF)
” 0002 “ - geometric art (reserved for other DDES use)
“0003 “- "OOQQ“ -
reserved for future DDES use
> “0099“ - available for vendor use
BP 31, 32 and 33 specify the number of UHLs on the tape, which shall, in sequence, be all DDES UHLs, followed
by all “other future use“ UHLs, followed by all vendor UHLs, regardless of the label number of each one. There
shall be no specific meaning or assumed sequence for the label number (BP 04) for numbers or letters in this field
(except for the DDES UHLs as specified in 6.7).
BP 34-35 specify the number of blocks within a file before the statt of the colour table. lt permits the vendor to
use this area for special purposes.
The current value of BP 36-80 shall be SPACEs.

---------------------- Page: 12 ----------------------
0 ISO
ISO 10756:1994(E)
7.2.2 File Header Label 1 (HDRl)
Table4 gives byte Position, field name, length in bytes and content for File Header Label 1 g
The contents of file identifier (BP 05-21), generation number (BP 36-39) and generation version number (BP 40-41)
tan be different between different operating Systems. These fields are not intended for use in intervendor Systems
communication.
The file set identifier (BP 22-27) does not contain a job name for DDES. The job name shall be contained in the
User Header Label 1 (see table6).
When the date is not defined, SPACE followed by five ZEROS or, alternatively, six ZEROS shall be used (see
BP 48-53 in table4).
Table 4 - File Header Label 1 (HDRl)
BP Field name L Conte
...