ISO 8126:2000

INTERNATIONAL ISO
STANDARD 8126
Second edition
2000-02-15
Micrographics — Duplicating film, silver,
diazo and vesicular — Visual density —
Specifications and measurement
Micrographie — Films de duplication argentiques, diazoïques et
vésiculaires — Densité visuelle — Spécifications et mesurage
Reference number
ISO 8126:2000(E)
©
ISO 2000

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ISO 8126:2000(E)
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ii © ISO 2000 – All rights reserved

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ISO 8126:2000(E)
Contents Page
Foreword.iv
Introduction.v
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 Measurement of density.2
4.1 Method of measurement of silver-gelatin and diazo duplicates.2
4.2 Method of measurement of vesicular duplicates .2
4.3 Measurement areas .2
4.3.1 Sampling aperture .2
4.3.2 Use of density patches.2
5 Visual diffuse transmission density of duplicate microforms from source documents and COM.2
5.1 Silver-gelatin duplicates .2
5.1.1 Positive-appearing duplicates.2
5.1.2 Negative-appearing duplicates.3
5.1.3 Direct positive duplicates .3
5.2 Diazo duplicates.3
6 Projection density of vesicular duplicates.3
6.1 Vesicular duplicates of source document microforms.3
6.1.1 Positive-appearing vesicular duplicates of source document microforms .3
6.1.2 Negative-appearing vesicular duplicates of source document microforms .3
6.2 Vesicular duplicates of COM microforms .3
© ISO 2000 – All rights reserved iii

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ISO 8126:2000(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. Each 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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
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.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 8126 was prepared by Technical Committee ISO/TC 171, Document imaging
applications, Subcommittee SC 1, Quality.
This second edition cancels and replaces the first edition (ISO 8126:1986) which has been technically revised.
iv © ISO 2000 – All rights reserved

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ISO 8126:2000(E)
Introduction
Microforms should be of such quality that the information contained is clearly legible, and suitable for its intended
end use. It is therefore important that documents for microfilming conform to microfilming criteria.
Controlling microimage density helps to ensure that good results are obtained. The overall quality of the master
directly affects duplicate quality.
Since first generation silver film densities can be measured using regular densitometers, a method had to be found
for measuring di
...