F-35-19 92-9E2h HOTEOO EO6TSEh 4238 TSO NTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONMEKIYHAPOHHAAOPTAH3ALIHIOCTAHIAPTH3ALIHWORGANISATION INTERNATIONALEDE NORMALISATION Cinematography - Optical printing ratios for enlargement and reduction of motion-picture film images - Specifications Cinematographie - Rapports d'agrandissement et de reduction d'image pour le tirage optique des films cinematographiques-Specifications First edition - 1976-12-15 Ref. No. ISO 4238-1976 (E) UDC 778.588.3 04238-1976 Descriptors : cinematography, motion-picture film, photographic images, printing, magnification, ratios. tion for Standardization Price based on 2 pages Not for Resale ing permitted without license from IHs 92-9E2h FOREWORD IsO (the International Organization for Standardization) is a worldwide federation of national standards institutes (iso Member Bodies). The work of developing International Standards is carried out through IsO Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up 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. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the Iso Council. International Standard ISO 4238 was drawn up by Technical Committee Cinematography, and was circulated to the Member Bodies in ISO/TC36， October1975. It has been approved by the Member Bodies of the following countries : Austria Italy Spain Belgium Sweden Japan Canada Korea, Rep. of Switzeriand Czechoslovakia Mexico Turkey Denmark United Kingdom Netherlands France Poland U.S.A. Germany .U.S.S.R. Romania India South Africa, Rep. of No Member Body expressed disapproval of the document. @ International Organization for Standardization, 1976 Printed in Switzerland yrightInternationalOrganization No reproduction or networking permitted without license from IHs Not for Resale 9OSTEO0 EO6TSEH 92-9e2h INTERNATIONAL STANDARD ISO 4238-1976 (E) Cinematography --. Optical printing ratios for enlargement and reduction of motion-picture film images - Specifications 1 SCOPE AND FIELD OF APPLICATION 3 SPECIFICATIONS This International Standard specifies the required ratios for optical enlargement and reduction of motion-picture film 3.1 The optical enlargement or reduction ratios shall be images in intermittent and continuous printing operations as specified in the table. in transferring film formats from one to another. 3.2 The ratios specified in the table are intended as 2 REFERENCES guidelines and shail not supersede the image dimensions specified in the fundamental standard for the particular IsO 74, Cinematography - Image area produced by camera format concerned. aperture and maximum projectable image area on 8 mm Type R motion-picture film - Positions and dimensions. NOTES IsO 466, Cinematography -- Image produced by 16 mm An enlargement ratio in optical printing implies the ratio of the motion-picture camera aperture - Position and dimensions. resulting image size to that of the image size of the original film IsO 2467, Cinematography - 65 and 70 mm motion- which is being reproduced. picture film -- Image area produced by camera aperture and 2 If the operation results in reduction of the image area, the ratio projectable image area. of enlargement islessthanone. Iso 2906, Cinematography motion-picture 35mm The ratios specified in the table are based on the use of unshrunk film -- Image area produced by camera aperture. films. IsO 3645, Cinematography - Image area produced by To reduce losses of picture information in printing when 4 transferring films from one format to another, the image 8mm Type s motion-picture camera aperture and enlargement ratios in intermittent optical printing should be as maximum projectable image area Positions a