1、BRITISH STANDARD BS ISO 7589:2002 Photography Illuminants for sensitometry Specifications for daylight, incandescent tungsten and printer ICS 37.040.10 BS ISO 7589:2002 This British Standard, having been prepared under the direction of the Consumer Products and Services Sector Policy and Strategy Co
2、mmittee, was published under the authority of the Standards Policy and Strategy Committee on 12 August 2002 BSI 12 August 2002 ISBN 0 580 40237 1 National foreword This British Standard reproduces verbatim ISO 7589:2002 and implements it as the UK national standard. It supersedes BS 1380-4:1986 whic
3、h is withdrawn. The UK participation in its preparation was entrusted to Technical Committee CPW/42, Photography, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement
4、 international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to
5、 include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any
6、enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a bla
7、nk page, pages 1 to 15, and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 7589:2002(E)INTERNATIONAL STANDARD ISO 7589 Second edition 2002-02-01 Photography I
8、lluminants for sensitometry Specifications for daylight, incandescent tungsten and printer Photographie Illuminants sensitomtriques Spcifications pour la lumire du jour, la lumire artificielle et la tireuse BSISO7589:2002IS:9857 O2002(E) lcsid FDParemi ihTs PDF file mac ytnoaie nmt deddebyfepca.se I
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13、eG 1121-HC 02 av leT. 4 + 10 947 22 1 11 xaF0 947 22 14 + 9 74 E-mail coirypthgiso.c h Web ww.wiso.ch Prnietdi nS wztierland ii I SO 2002 Allr ithgsr ese devrBSISO7589:2002iiIS:9857 O2002(E) I SO 2002 All irthgs ersedevr iiiContents Page Foreword.iv Introduction.v 1 Scope 1 2 Normative references1 3
14、 Terms and definitions .1 4 ISO sensitometric illuminants 2 4.1 General2 4.2 ISO sensitometric daylight illuminant .2 4.3 ISO sensitometric studio tungsten illuminant3 4.4 ISO sensitometric photoflood illuminant 3 4.5 ISO sensitometric printer illuminant3 5 Camera films: Spectral distribution index
15、(ISO/SDI)3 5.1 General3 5.2 Weighted spectral sensitivity values.3 5.3 Calculation of the ISO/SDI 3 5.4 Tolerances for ISO/SDI4 6 Black-and-white papers: Spectral distribution index (ISO/SDI)4 6.1 General4 6.2 Weighted spectral sensitivity values.4 6.3 Calculation of the ISO/SDI 4 6.4 Tolerances for
16、 ISO/SDI5 Annex A (informative) Example sources 9 Annex B (informative) Exposure calculations12 Annex C (informative) Average colour film sensitivities.13 Annex D (informative) Average black-and-white printing paper sensitivities 14 Bibliography15 BSISO7589:2002iiiIS:9857 O2002(E) vi I SO 2002 All i
17、rthgs ersedevr 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 subjec
18、t 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)
19、 on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committee
20、s 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 s
21、hall not be held responsible for identifying any or all such patent rights. ISO 7589 was prepared by Technical Committee ISO/TC 42, Photography. This second edition cancels and replaces the first edition (ISO 7589:1984), which has been technically revised and enlarged to include a standard sensitome
22、tric illuminant for black-and-white papers. Annexes A to D of this International Standard are for information only. BSISO7589:2002ivIS:9857 O2002(E) I SO 2002 All irthgs ersedevr vIntroduction Colour and black-and-white camera films are most commonly designed for use with three light sources, these
23、being daylight, studio tungsten (type B) and photoflood (type A), while black-and-white papers are most commonly used with enlargers employing incandescent tungsten sources. This International Standard specifies three corresponding illuminants for film sensitometry and one for black-and-white paper
24、sensitometry, since most meaningful results are obtained when exposing conditions match those of actual film or paper use. Two other important photographic light sources for film, the electronic flashtube and blue photoflash lamps, give light of a colour that approximates daylight so that the sensit
25、ometric daylight illuminant also serves for films used with them. This International Standard constitutes a revision of the first edition, ISO 7589:1984. It differs from the first edition in that it includes a standard sensitometric illuminant for black-and-white papers (the first edition dealt with
26、 camera film illuminants only). No standard exists for the determination of the speeds of colour papers. The illuminants described in this International Standard are used in ISO 3028, ISO 6728 and other International Standards which describe methods for determining the speed of various types of sens
27、itized products. BSISO7589:2002vINTENRATIONAL TSANDADR IS:9857 O2002(E)I SO 2002 All irthgs ersedevr 1Photography Illuminants for sensitometry Specifications for daylight, incandescent tungsten and printer 1 Scope This International Standard specifies the spectral characteristics of illuminants for
28、sensitometry appropriate for evaluating camera films used for pictorial photography in natural daylight, studio tungsten and photoflood, including colour and black-and-white films, both reversal and negative types, and for evaluating black-and-white papers used with incandescent tungsten printers. I
29、t also describes methods for evaluating the acceptability of illuminants for sensitometry and specifies tolerances. It does not include illuminants for use with colour papers, since this would need to take account of the coloured mask of the negative material, for which no standard information is at
30、 present available. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. Howeve
31、r, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IE
32、C maintain registers of currently valid International Standards. ISO 3028:1984, Photography Camera flash illuminants Determination of ISO spectral distribution index (ISO/SDI) ISO 6728:1983, Photography Camera lenses Determination of ISO colour contribution index (ISO/CCI) 3 Terms and definitions Fo
33、r the purposes of this International Standard, the following terms and definitions apply. 3.1 source physical emitter of energy 3.2 illuminant light impinging on a sensitized material and having a specific spectral power distribution not necessarily provided directly by a source and not necessarily
34、realizable by a source 3.3 relative spectral power distribution description of the spectral character of radiation by the relative spectral distribution of some radiometric quantity (radiant flux, radiant intensity) BSISO7589:20021IS:9857 O2002(E) 2 I SO 2002 All irthgs ersedevr 3.4 distribution tem
35、perature thermodynamic temperature of the full radiator for which the ordinates of the spectral distribution curve of its radiance are proportional, in the visible region, to those of the distribution curve of the radiation considered 3.5 photographic daylight relative spectral power distribution of
36、 typical daylight having a correlated colour temperature of approximately 5 500 K NOTE This describes the combination of skylight and sunlight when the sun is about 40 above the horizon with a clear atmosphere, and is designated as D 55 . 3.6 spectral distribution index SDI three-number designation
37、for camera films which describes the degree to which a light source is expected to change the overall colour of a photograph relative to that obtained with a specified illuminant, and two-number designation for black-and-white enlarging papers which describes the degree to which a light source affec
38、ts the relative contributions from emulsion sensitivity and dye sensitivity 4 ISO sensitometric illuminants 4.1 General This International Standard is concerned with the simulation of the spectral quality of radiation incident on the film (not the camera) or on the enlarger baseboard (not the enlarg
39、er lamp). In order to realize this simulation, a given photographic illuminant (which is concerned with the light illuminating the subject matter or the light before passing through the optical system of a printer) has to be suitably modulated. For the purposes of this International Standard, the IS
40、O standard camera lens specified in ISO 6728 has been taken as the best available modulator for which standard data are available. The relative spectral power distributions of the four ISO sensitometric illuminants described in this International Standard are normally obtained by operating a lamp at
41、 a specified condition and modulating the flux with selectively absorbing filters of suitable spectral transmittance. It should be emphasized that this International Standard specifies the relative spectral distribution of power incident on the exposure plane at 10 nm intervals, i.e. the relative sp
42、ectral power emitted by a source and its modulation by all elements in the sensitometer that affect the spectral quality, for example filters, mirrors and optical wedge. 4.2 ISO sensitometric daylight illuminant This is suitable for the sensitometry of “daylight balanced” colour films and is also no
43、rmally used for black-and- white camera films. These films are designed to be exposed in photographic daylight (see 3.5) or with flash. The spectral power distribution used to represent photographic daylight was taken from the data of Judd et al. 4who give typical spectral irradiance data for five d
44、ifferent conditions of daylight (skylight and sunlight plus skylight). Data corresponding to a correlated colour temperature of 5 500 K were selected as the most appropriate for photography and designated as D 55 . This is the prevailing condition in temperate zones during the daylight hours recomme
45、nded for colour photography. The ISO sensitometric daylight illuminant is defined as the product of the spectral power distribution of photographic daylight (D 55 ) and the spectral transmittance of the International Standard camera lens, ( ) . The aim values, S , for the relative spectral power dis
46、tribution for this illuminant are given in Table 1. An illuminant complying with these values within the tolerances specified in 5.4 may be designated “ISO sensitometric daylight illuminant”. BSISO7589:20022IS:9857 O2002(E) I SO 2002 All irthgs ersedevr 34.3 ISO sensitometric studio tungsten illumin
47、ant This is suitable for the sensitometry of type B colour films which are normally exposed with lamps described as 3 200 K lamps. However, the effect of lamp age, reflectors, diffusers and general studio conditions is to reduce the average effective distribution temperature to about 3 050 K. The sp
48、ectral power distribution used to represent studio tungsten was obtained by spectroradiometric measurements in several professional photographic studios. The aim values, S , for the relative spectral power distribution for this source after modulation by the ISO standard lens are given in Table 2. A
49、n illuminant complying with these values within the tolerances specified in 5.4 may be designated “ISO sensitometric studio tungsten illuminant”. 4.4 ISO sensitometric photoflood illuminant This illuminant is suitable for the sensitometry of type A colour films. The spectral power distribution used to represent photoflood lamps is that of a black body at 3 400 K. The aim values, S , for the relative spectral power distribution of this so
