ISO/TR 13928:1994
(Main)Application guide for ISO 10755, ISO 10756, ISO 10757, ISO 10758 and ISO 10759
Application guide for ISO 10755, ISO 10756, ISO 10757, ISO 10758 and ISO 10759
Intended to assist users to understand the application of these standards. Gives particular notes to the individual standards and describes certain assumptions made during the development of these specifications.
Guide d'application pour ISO 10755, ISO 10756, ISO 10757, ISO 10758 et ISO 10759
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TECHNICAL ISO
REPORT TR 13928
First edition
1994-1 l-l 5
Application guide for ISO 10755, ISO 10756,
ISO 10757, ISO 10758 and ISO 10759
Guide d ’application pour ISO 10755, ISO 10756, ISO 10757, ISO 10758
et ISO 10759
Reference number
ISO/TR 13928:1994(E)
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ISO/TR 13928: 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
(IEC) on all matters of electrotechnical standardization.
The main task of technical committees is to prepare International Stan-
dards, but in exceptional circumstances a technical committee may pro-
pose the publication of a Technical Report of one of the following types:
- fype 1, when the required support cannot be obtained for the publi-
cation of an lnlernaeional Standard, despite repeaaed efforts;
- type 2, when the subject is still under technical development or where
for any olher reason there is the future but not immediate possibility
sf an agreemen4i on an Inaernational Standard;
- type 3, when a technical committee has collected da ”ca of a different
kind from that which is normallv published as an International Standard
( “sitate of the art ”, for example).
Technical Reports of types 1 and 2 are subject to review within three years
of publication, to decide whether they tan be transformed into Inter-
national Standards. Technical Reports of type 3 do not necessarily have to
be reviewed until the data they provide are considered to be no longer
valid or useful.
lSO/TR 13928, which is a Technical Report of type 3, was prepared by
Technical Committee lSO/TC 130, Graphit technology.
This Technical Report has been developed to help implernentors and users
of ISO 10755 to ISO 10759. lt is intended to Supplement the above Inter-
national Standards.
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
ii
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TECHNICAL REPORT Q ISO ISO/TR 13928: 1994(E)
Application guide for ISO 10755, ISO 10756, ISO 10757,
ISO 10758 and ISO 10759
A l ISO 10755,10756 amd 10759 Implementors’ Guide
This guide has been developed to help implernentors of ISO 10755, 10756 and 10759,
the Standards for the exchange of colour picture, colour line art and monochrome image data
on magnetic tape, develop their Software. As various implernentors have encountered areas of
questions or concern, ISO/TC 13OlWG 2 has attempted to clarify the clause in question via
this guide. THE INFORMATION CONTAINED IIEREIN DOES NOT REPLACE OR
MODIFY IN ANY WAY ANY PART OF ISO 90755, 110756 OR 10759, This guide is meant to
augment the specifications themselves. n any cases where a conflict exists between the two,
ISO 10755, 10756 and 10759 take precedence,
Clause numbers will be used to locate the reader within the proper clauses of the
Claus, n-umbers refer to all three International Standards IS
refixed by individ.ual International Standard numbers,
3 . Normative References
The ISO 1001 document referenced has been updated to 1986. The newest Version
appears to be identical to the DDES implementation where applicable, except for the use of
the value “4” in BP 80 of VOL 1 (see clause 7.2.1). In Order to maintain Software
compatibility, UEFOO has not been changed at this time. It Ps anticipated that a future
version of UEFOO will provide for values of either a “3” or “4” in BP 80 of VOL 1 in Order to
provide conformance to the current version of ISO 1001.
. DDESOO Tapes
62
As an alternative medium to half-inch reel to reel tape, the 8-mm Helical-Scan
Digital Computer Tape Cartridge may be used if the participants in an interchange agree.
This medium and recording method is being specified by ISO/IEC JTC 1, and when an
International Standard results from this work, an amen.dment to clause 6.2 or ISO 10755,
10756 and 10759 will be proposed to cover this additional medium.
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ISO/TR 13928: 1994(E) 0 ISO
When the 8mm tape is used, the participants must also agree on the block size to be
used in the header and trailer labels. Two values are common, 80 bytes and 1024 bytes. If the
value 1024 is used, data is only written in the first 80 bytes; the remainder of the block
should not contain any data.
63 . Extended User Exchange Format
To provide flexibility for the future the concept of the Extended User Exchange
Format was developed to provide Options for those implernentors willing or able to use them.
While it is necessary for an implernentor to implement all UEF capabilities and features in
Order to meet full compliance with ISO 10755,10756 or 10759, an implernentor of EUEF
capabilities and features may selectively implement only those features desired and still be in
compliance (providing, of course, that those features Chosen are implemented according to ISO
10755, 10756 or 10759 and all of the UEF subset is implemented).
66 . Padding of Fields and Document Conventions
Where the specification calls for padded blanks or Zeros, the blanks or Zeros must be
present in Order to be in conformance with ISO 10755, 10756 or 10759.
68 . Intermixing tape formats
The DDES tape format is defined identically in ISO 10755,10756 and 10759. It is
therefore entirely reasonable to record colour picture, colour line art and monochrome picture
files on the Same tape to represent the different components of a page or a job.
Furthermore, the Parameters and layout of the ISO 10755, 10756 and 10759 file
headers have been kept identical to the extent that this was possible, to allow for common
implernentations.
71 . General Tape Format
When a file is Split over multiple tapes in a volume set, the values in corresponding
user header labels shall be the Same for all file sections of that file.
The occurrence of the physical end of tape mark (EOT) Prior to the end of the data on
the tape (indicated by two logical tape marks) in the first tape of Figure 2 (illustration of two
picture files on two tapes) is not an error. As specified in ISO 1864, the EOT mark is
physically placed on the tape Prior to the absolute end of the tape so that there is enough
room to allow end of tape processing (i.e., end of volume and trailer records) once the EOT is
encountered by the tape Controller.
7.2.1 Volume 1 Header (VOL 1)
The volume identifier (BP 05-10) for purposes of ISO 10755, 10756 and 10759 is not
checked but tan be important for tape volume tracking and management. Its use is
recommended.
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0 ISO
ISO/TR 13928:1994(E)
7.2.2 File Header Label 1 (HDRl)
The HDR 1 (the first header label of each file) should include an ascending “file
sequence number ”. The motivation for counting the files is especially significant for
continuation tapes, but should be correct in any case. In particular, the use of a value of “1”
for every file should be avoided.
7.2.3 File Header Label 2 (HDR2)
UEFOO specifies fixed length 8192 byte block sizes. If the last block on a tape does not
require the full8192 bytes, the block should be padded to achieve a uniform fixed block size.
7.2.4 User Header Label 1 (UHLP)
It is strongly recommended to include the three-Character country code from ISO
3166 “Codes for the representation on names of countries as the last three characters of the
“Vendor name” field (i.e. BP 28-3O), to identify the country of registry sf the vendor name.
P SI-SO) as a unique identification.
The UHLII should use the “picture name” field (
Using the Same value for different files may result in some Systems overwriting previous files.
The picture name should not be left blank even though the “file identifier” in HDRl may
contain the picture name as well.
7.2.5 User Header Label 2 (UHL2)
The offset to Start of data (BP 34-35) is a file specific area which occurs once per file,
not once for each file section.
Ps0 10755 7.2.6.1.1 Pixel Interleaving
When using the Pixel interleaving format with an even number of colour Separations,
it is permissible but not necessary to pad lines that have an odd number of Pixels since the
line length is already an even number of bytes.
7.2.6.3 Colour Values
It is possible that the colour values sf the Pixels tan fall above or below the values
specified in BP 25-28 and 29-32 sf UHL3 for 0% dot and 100% dot. In this case it is at the
discretion of the receiving System to either accept or truncate the data (e.g., where the value
for 0% dot is “20” and the data value is “15 ”, the resulting data value after transfer would be
,,20 ”).
3
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0 ISO
ISO/TR 13928: 1994(E)
7.2.6.4 Picture Orientation
The various fields in UHL3 from BP 33-80 all interact to describe the size and
orientation of the logical image on tape. It is important to remember that the length of line
and breadth of area fields are all referring to the bags of Pixels on tape, and not the logical
image itself. The term “length” or “line” defined in BP 33-42, 53-58, 67 and 69-74 refers to the
dimension of the image represented by the frst row of Pixels on the tape. The term “breadth”
defined in BP 43-52, 59-64,68 and 75-80 refers to the dimension of the image represented by
the number of lines on the tape. For example, orientations “00” and “02” define “length” as
the horizontal axis of the logical image, and “breadth” as the vertical axis. Qrientations “OP”
and “03” define “length” as the vertical axis and “breadth” as the horizontal axis,
Pixels do not need to be Square in size. To properly size an image the resolution of
both axes must be considered. The necessary information is provided by the size specifications
for each axis, and the number of Pixels of each axis. From these numbers, the resolution
(where resolution is the number of Pixels per inch or mm) for each axis may be determined by
dividing the number of Pixels by the size. There is an optional set of fields to present this
data, and if present, must agree with the calculation.
81 EOFn - EOVn
.
The block count (BP 56-61 of EOFl) for a file section includes any vendor offset blocks (BP 34-
35 of UHL2) present in that file section.
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0 ISO ISO/TR 13928:1994(E)
B 0 ISO 10755,10756,10759 Users’ Guide
This guide has been developed to help users of ISO 10755,10756 and 10759
understand what is happening as they transfer image files from one System to another. As
various users have encou
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