1、BSI Standards PublicationBS ISO 2939:2015Cinematography Pictureimage area on 35 mm motion-picture release prints Position and dimensionsand analogue and digitalphotographic sound to picturerecord displacementBS ISO 2939:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementa
2、tion of ISO 2939:2015. It supersedes BS ISO 2939:2002 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee CPW/36, Cinematography.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not pur
3、port to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 77748 6 ICS 37.060.20 Compliance with a British Standard cannot confer immunity from legal oblig
4、ations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e d ISO 2015Cinematography Picture image area on 35 mm motion-picture release prints Position and dimen
5、sions and analogue and digital photographic sound to picture record displacementCinmatographie Champ dimage sur les copies dexploitation de 35 mm Position et dimensionsINTERNATIONAL STANDARDISO 2939Fourth edition 2015-06-15Reference number ISO 2939:2015(E)BS ISO 2939:2015ISO 2939:2015(E)ii ISO 2015
6、All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the inte
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8、ightiso.orgwww.iso.orgBS ISO 2939:2015ISO 2939:2015(E)Foreword iv1 Scope . 12 Normative references 13 Position and dimensions 14 Picture sound displacement . 15 Technical characteristics . 2Annex A (informative) Compensation for slow speed of sound in air . 4Bibliography 5 ISO 2015 All rights reserv
9、ed iiiContents PageBS ISO 2939:2015ISO 2939:2015(E)ForewordISO (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
10、 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 Internationa
11、l Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different t
12、ypes of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not
13、be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is info
14、rmation given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see t
15、he following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 36, Cinematography.This fourth edition cancels and replaces the third edition (ISO 2939:2002), which has been technically revised. The references to the position and locations of photographic
16、sound records shown in the second edition, and removed in the third edition, have been amended and replaced in this fourth edition together with an informative annex providing information regarding the amendment.iv ISO 2015 All rights reservedBS ISO 2939:2015INTERNATIONAL STANDARD ISO 2939:2015(E)Ci
17、nematography Picture image area on 35 mm motion-picture release prints Position and dimensions and analogue and digital photographic sound to picture record displacement1 ScopeThis International Standard specifies the positions, dimensions, and location of image and photographic sound records on 35
18、mm motion-picture release prints, which have been assigned for optical projection based on ISO 2907 or transmitted by television based on ISO 1223.It also specifies the relative displacement of sound with respect to the corresponding picture image frame and, through normative reference to ISO 17266,
19、 the placements of the multichannel analogue and digital photographic sound and control records.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited appl
20、ies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 1223, Cinematography Picture areas for motion-picture films for television Position and dimensionsISO 2907, Cinematography Maximum projectable image area on 35 mm motion-picture film Pos
21、ition and dimensionsISO 17266, Cinematography Multichannel analogue and digital photographic sound and control records on 35 mm motion-picture prints and negatives, and digital sound-control records on 70 mm motion-picture prints and negatives Position and width dimensions3 Position and dimensions3.
22、1 The dimensions of the picture image area shall be as shown in the figure and as specified in Table 1.3.2 The position and width dimensions of the multichannel analogue and digital photographic sound and control records shall be in accordance with ISO 17266.3.3 The dimensions given in this Internat
23、ional Standard are relative to un-shrunk film.4 Picture sound displacementThe recording of sound on film shall precede the corresponding picture frame in the direction of film travel in normal projection. The distance between the horizontal centre-line of the picture frame and the horizontal centre-
24、line of its corresponding analogue sound record frame shall be 20 frames 0,5 frame (80 perforations 2 perforations).NOTE The record location and reproduction compensation characteristics of each digital photographic sound and control record are intrinsically set such that all digital sound records a
25、re reproduced in synchronisation with the reproduction of the analogue sound record. The analogue sound record is the reference sound record for establishing correct picture-sound displacement as its modulation is visible to the eye. ISO 2015 All rights reserved 1BS ISO 2939:2015ISO 2939:2015(E)5 Te
26、chnical characteristicsSpaces between image frames, the image and the sound record and perforations should be substantially opaque.Table 1 Dimensions of picture image areaDimensions mm inA787015008,+0 3100 0060 003,+Bref21,77 0,857Cnom18,75 0,738Dmin29,64 1,167H1a18,60 min. 0,732 min.H2b16,00 min. 0
27、,630 min.H3c12,80 min. 0,504 min.Rmax0,8 0,03E = F 0,25 0,010K = L approximately equal approximately equalaFor wide-screen films with anamorphic pictures and aspect-ratios from 2,35:1 to 2,39:1.bFor films with non-anamorphic pictures and an aspect-ratio of 1,37:1.cFor film with a non-anamorphic pict
28、ure intended for projection with the picture masking and aspect ratio up to 1,85:1.2 ISO 2015 All rights reservedBS ISO 2939:2015ISO 2939:2015(E)Key1 location of axis of intended image 3 reference edge2 direction of light beam 4 direction of film travelNOTE The film is shown as it would be seen from
29、 the projector light source looking towards the lens with the photographic layer towards the observer.Figure 1 Position and dimensions of picture image area ISO 2015 All rights reserved 3BS ISO 2939:2015ISO 2939:2015(E)Annex A (informative) Compensation for slow speed of sound in airISO 2939:1986, w
30、hich is the second edition, specified a sound-to-picture displacement of 21 frames 0,5 frames. It had a note in 2.3 that suggested an average seat location of 15 m from the screen requires a 1-frame advancement of sound relative to picture to compensate for the relatively slow speed of sound in air,
31、 and that this advancement is achieved when a leader film, made in accordance with ISO 4241, is used to assist in the threading of film so that the analogue sound pickup is 20 frames in advance of the picture gate, i.e. 21 frames minus 1 frame.It has been found that such compensation has not been ad
32、opted in the field and that typical international laboratory practice has been to implement a 20-frame displacement in spite of the provisions of previous editions of this International Standard. It has also been found that advancement of sound causes early sound relative to image when viewing dista
33、nces are relatively close and that, because early sound is not a naturally-occurring phenomenon, this is found objectionable by many cinema-goers. It is a natural phenomenon to experience, and thus tolerate, late sound relative to image when viewing distances are greater. The need for compensation i
34、s, therefore, largely unnecessary and unwelcome.4 ISO 2015 All rights reservedBS ISO 2939:2015ISO 2939:2015(E)Bibliography1 ISO 491:2002, Cinematography 35 mm motion-picture film and magnetic film Cutting and perforating dimensions2 ISO 2906:2002, Cinematography Image area produced by camera apertur
35、e on 35 mm motion-picture film Position and dimensions3 ISO 4241:2001, Cinematography Theatre projection leader, trailer and cue marks Specifications4 ISO 8567:2002, Cinematography Maximum permissible area for subtitle on 35 mm and 16 mm motion-picture release prints - Position and dimensions ISO 20
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