1、BRITISH STANDARD BS 5550-5.5.1: 1978 ISO 4238:1976 Cinematography Part 5: Common to more than one film gauge Section 5.5 Printing Subsection 5.5.1 Specification for optical printing ratios for enlargement and reduction of motion-picture film images UDC 778.5:778.588.3BS5550-5.5.1:1978 This British S
2、tandard, having been prepared under the directionof the Cinematograph Standards Committee, was published under the authority ofthe Executive Board on 31March1978 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference CMS/3 Draft for comment 75/62783 ISBN 0
3、580 10084 7 Cooperating organizations The Cinematograph Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government department and scientific and industrial organizations: Association of Cinematograph, Television and Allied
4、 Technicians* British Broadcasting Corporation* British Film Institute* British Kinematograph, Sound and Television Society* British Photographic Manufacturers Association Cinematograph Exhibitors Association of Great Britain and Ireland* Federation of Specialised Film Associations Film Laboratory A
5、ssociation Film Production Association of Great Britain Health and Safety Executive Illuminating Engineering Society Incorporated Association of Kinematograph Manufacturers Ltd. Independent Television Companies Association* Kinematograph Renters Society Ltd. Royal Photographic Society The organizati
6、ons marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Association of Independent Cinemas Institute of Amateur Cinematographers National Association of Theatrical, Television atte
7、ntion is especially drawn to the following. The comma has been used in some places as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Where the words “International Standard” appear, referring to this standard, they should be i
8、nterpreted as “British Standard”. Cross-references. The following International Standards are referred to in the text and for each there is a corresponding British Standard; these are as listed below: International Standard Corresponding British Standard ISO 74:1976 BS 5550 Cinematography Subsection
9、 1.2.1:1978 Positions and dimensions of the image area produced by camera aperture and maximum projectable image area on 8 mm Type R motion-picture film (identical) ISO 466:1976 BS 5550 Cinematography Subsection 2.2.1:1978 Position and dimensions of the image produced by 16 mm motion-picture camera
10、aperture (identical) ISO 2467:1972 BS 5550 Cinematography Subsection 4.2.1:1978 Image area produced by camera aperture and projectable image area on 65 mm and70mm motion-picture film (identical) ISO 2906:1972 BS 5550 Cinematography Subsection 3.2.1:1978 Image area produced by camera aperture on 35 m
11、m motion-picture film (identical)BS5550-5.5.1:1978 BSI 10-1999 iii NOTEIn the table in ISO4238, reference is made to ISO/R 74, ISO/R 74 has been superseded by ISO74, which is included in clause2 in the list of references. A British Standard does not purport to include all the necessary provisions of
12、 a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. ISO 3645:1976 BS 5550 Cinematography Subsection 1.2.2:1978 Positions and dimensions of the image area produced by 8 mm
13、Type S motion-picture camera aperture and maximum projectable image area (identical) Summary of pages This document comprises a front cover, an inside front cover, pagesi toiv, pages1and2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had ame
14、ndments incorporated. This will be indicated in the amendment table on the inside front cover.iv blankBS5550-5.5.1:1978 BSI 10-1999 1 1 Scope and field of application This International Standard specifies the required ratios for optical enlargement and reduction of motion-picture film images in inte
15、rmittent and continuous printing operations in transferring film formats from one to another. 2 References ISO 74, Cinematography Image area produced by camera aperture and maximum projectable image area on 8 mm Type R motion-picture film Positions and dimensions. ISO 466, Cinematography Image produ
16、ced by16mm motion-picture camera aperture Position and dimensions. ISO 2467, Cinematography 65 and 70 mm motion-picture film Image area produced by camera aperture and projectable image area. ISO 2906, Cinematography 35 mm motion-picture film Image area produced by camera aperture. ISO 3645, Cinemat
17、ography Image area produced by 8 mm Type S motion-picture camera aperture and maximum projectable image area Positions and dimensions. 3 Specifications 3.1 The optical enlargement or reduction ratios shall be as specified in the table. 3.2 The ratios specified in the table are intended as guidelines
18、 and shall not supersede the image dimensions specified in the fundamental standard for the particular format concerned. NOTE 1An enlargement ratio in optical printing implies the ratio of the resulting image size to that of the image size of the original film which is being reproduced. NOTE 2If the
19、 operation results in reduction of the image area, the ratio of enlargement is less than one. NOTE 3The ratios specified in the table are based on the use of unshrunk films. NOTE 4To reduce losses of picture information in printing when transferring films from one format to another, the image enlarg
20、ement ratios in intermittent optical printing should be as close as possible to the minimum values given in the table unless cropping of the image in the original is required. Variant Original material Film print obtained Enlargement ratio Image Image in intermittent printing minimum continuous prin
21、ting, nominal film width mm character dimensions film width mm character dimensions width height width height 1 65 or70 non- anamorphotic ISO 2467 35 anamorphotic ISO 2906 0,42 0,80 0,42 0,802 2 35 non- anamorphotic ISO 2906 0,70 3 35 anamorphotic ISO 2906 70 non- anamorphotic ISO 2467 2,40 1,24 2,4
22、0 1,253 4 35 non- anamorphotic ISO 2906 1,70 0,86 5 non- anamorphotic ISO 2906 16 non- anamorphotic ISO 466 0,465 6 8R non- anamorphotic ISO/R 74 0,23 7 8S non- anamorphotic ISO 3645 0,26 8 16 non- anamorphotic ISO 466 35 non- anamorphotic ISO 2906 2,18 9 8R non- anamorphotic ISO/R 74 0,50 0,501 10
23、8S non- anamorphotic ISO 3645 0,55 0,5572 blankBS5550-5.5.1:1978 BSI 10-1999 Publications referred to See national forewordBS 5550-5.5.1: 1978 ISO 4238:1976 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishS
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