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1、BRITISH STANDARD BS ISO 12612:1997 Cinematography Interchange of post-production materials ICS 37.060.20 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:53:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 12612:1997 This British Standard, having been prepared under the direction of the
2、 Consumer Products and Services Sector Board, was published under the authority of the Standards Board and comes into effect on 15 September 1997 BSI 09-1999 ISBN 0 580 28446 8 National foreword This British Standard reproduces verbatim ISO 12612:1997 and implements it as the UK national standard. T
3、he UK participation in its preparation was entrusted to Technical Committee CPW/36, Cinematography, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and kee
4、p the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publ
5、ications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary pro
6、visions of 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. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ISO title
7、page, pages ii to iv, pages 1 to 7 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffiel
8、dun sheffieldun, na, Sun Nov 26 12:53:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 12612:1997 BSI 09-1999i Contents Page National forewordInside front cover Forewordiii Text of ISO 126121 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:53:54 GMT+00:00 2006, Uncontrolled Copy, (c) B
9、SI ii blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:53:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:53:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 12612:1997 ii BSI 09-1999 Contents Page Forewordiii 1Scope1 2Normat
10、ive references1 3Requirements for post-production picture elements1 4Requirements for post-production sound elements2 5Packing and marking5 Annex A (informative) Additional information6 Annex B (informative) Bibliography6 Table A.1 LAD densities6 Descriptors: Cinematography, cinematographic producti
11、on, motion-picture film 35 mm, motion-picture film 70 mm, specifications, characteristics, recording characteristics, marking, packaging. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:53:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 12612:1997 BSI 09-1999iii Foreword ISO (the Inte
12、rnational 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
13、 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 s
14、tandardization. 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. International Standard ISO 12612 was prepared by Technica
15、l Committee ISO/TC 36, Cinematography. Annex A and Annex B of this International Standard are for information only. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:53:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:53:54 GMT+
16、00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 12612:1997 BSI 09-19991 1 Scope 1.1 This International Standard specifies certain parameters and technical characteristics of post-production motion-picture materials used in the international exchange of 35 mm and 70 mm picture and sound elements. 1.2 T
17、his International Standard further specifies a method for the evaluation of picture-image quality based on a standardized test image contained in the post-production picture elements. 2 Normative references The following standards contain provisions which, through reference in this text, constitute
18、provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the st
19、andards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 5-2:1991, Photography Density measurements Part: 2: Geometric conditions for transmission density. ISO 5-3:1995, Photography Density measurements Part 3: Spectral conditions. ISO 162:19
20、85, Cinematography Head gaps and sound records for three-, four-, or six-track magnetic sound records on 35 mm and single-track on 17,5 mm motion-picture film containing no picture Positions and width dimensions. ISO 491:1995, Cinematography 35 mm motion-picture film and magnetic film Cutting and pe
21、rforating dimensions. ISO 1039:1995, Cinematography Cores for motion picture and magnetic film rolls Dimensions. ISO 2467:1980, Cinematography Image area produced by 65 and 70 mm motion-picture camera aperture and maximum projectable image area on 70 mm motion-picture prints Positions and dimensions
22、. ISO 2906:1984, Cinematography Image area produced by camera aperture on 35 mm motion-picture film Position and dimensions. ISO 2907:1984, Cinematography Maximum projectable image area on 35 mm motion-picture film Position and dimensions. ISO 2910:1990, Cinematography Screen luminance for the proje
23、ction of motion-picture prints in indoor theatres and review rooms. ISO 3023:1995, Cinematography 65 mm and 70 mm unexposed motion-picture film Cutting and perforating dimensions. ISO 4241:1987, Cinematography Leaders and run-out trailers for 35 mm and 16 mm release prints Specifications. ISO 4834:1
24、986, Cinematography Magnetic sound test films excluding striped release prints Basic technical characteristics. ISO 5758:1987, Cinematography Labelling of containers for motion-picture film and magnetic materials Minimum information for exchange of materials. ISO 6038:1993, Cinematography Splices fo
25、r use on 70 mm, 65 mm, 35 mm and 16 mm motion-picture films Dimensions and locations. ISO 9525:1988, Cinematography Recording head gaps for two sound records on 17,5 mm magnetic film Positions and width dimensions. 3 Requirements for post-production picture elements 3.1 Cutting and perforating dimen
26、sions Cutting and perforating dimensions for photographic films shall be in accordance with the International Standards given in 3.1.1 to 3.1.3. 3.1.1 For 35 mm original negatives, master positives and duplicate negatives: ISO 491 (preferred Type N perforation and 4,74 mm perforation pitch). 3.1.2 F
27、or 35 mm projection prints: ISO 491 (Type P perforation and 4,75 mm perforation pitch). 3.1.3 For 65 mm original negatives, master positives and duplicate negatives and for 70 mm projection prints: ISO 3023. 3.2 Position and dimensions of picture areas Position and dimensions of picture areas shall
28、be in accordance with the International Standards given in 3.2.1 and 3.2.2. 3.2.1 For 35 mm: ISO 2906 and ISO 2907. 3.2.2 For 65 mm and 70 mm: ISO 2467. 3.3 Splices Splices shall be in accordance with ISO 6038. 3.4 Requirements for photographic characteristics The photographic characteristics of pos
29、t-production picture materials to be interchanged shall be evaluated using densitometric measurements of a test image which is spliced into the original picture rolls and reproduced through the successive stages of duplication. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:53:54 GMT+00:0
30、0 2006, Uncontrolled Copy, (c) BSI BS ISO 12612:1997 2 BSI 09-1999 The control method is based upon the Laboratory Aim Density system (LAD system) (see clause A.1 for a reference concerning the implementation of this system), which assigns specific density values to a control patch in a test image w
31、hich is spliced into the original camera film, and is then read at each stage throughout the sequence to the projection print. All scenes within the motion picture are graded (timed) relative to the test image which is considered as a “perfect” scene. Density aim values are chosen so that the print-
32、through equivalent neutral densities on each film in the post-production sequence fall approximately at the mid-point of the straight line portion of that films characteristic curves. This achieves the following two objectives. a) Most significant picture information is placed on the linear portion
33、of the duplicating films characteristic curve, carrying a maximum of highlight and shadow information. b) A neutral grey scale is maintained throughout the post-production, aiding, in colour grading (timing). A suitable LAD control image begins as a camera image incorporating a uniform neutral patch
34、 of sufficient size for convenient densitometric measurements. This patch may be positioned within a scene suitable for subjective evaluation. An 18 % reflectance grey card under scene illumination is usually appropriate. This LAD control image is spliced into the roll of original negative as specif
35、ied in 3.5.3. Ultimately, picture quality will be reviewed subjectively, but within the tolerances of normal film, printer and process variability, and the characteristics of specific duplicating film systems, objective measurements of the LAD system assist in readily obtaining consistent duplicates
36、 with good tone and colour reproduction characteristics. 3.4.1 Densitometry The densities of all picture materials intended for reproduction shall be measured using ISO standard diffuse status M transmission densitometry (ISO 5-2 and ISO 5-3). Densities of picture materials intended for viewing by p
37、rojection shall be measured using ISO standard diffuse status A transmission densitometry. 3.4.2 Density of the original camera negative LAD test image (LAD control patch) The densities of the LAD control patch (see clause A.2) shall be chosen to be representative of the centre of scene density rang
38、e normally obtained on a modern (colour-masked) colour negative film with normal exposure and processing. 3.4.3 Density of the LAD test image in master positive The LAD control patch should be printed to the centre of the usable straight-line portion of the duplicating film. These aim densities are
39、specified by the film manufacturer for the particular duplicating stock. 3.4.4 Density of the LAD test image in duplicate negative The LAD control patch should be printed according to the aim densities specified by the film manufacturer for the particular duplicating stock. These densities are norma
40、lly near the centre of the usable straight-line portion of the characteristic curve, but may be different from those specified for the master positive in order to aid intercutability with original camera negatives and to facilitate high-speed printing. 3.4.5 Density of the LAD test image in projecti
41、on print The LAD control patch should be printed to a neutral grey of 1,00 density (1,00 equivalent neutral density) on the print. The status A densities corresponding to a 1,00 neutral grey are specified by the film manufacturer, and will depend upon the dyes in the print film and the viewing illum
42、ination in accordance with ISO 2910. 3.5 Leaders for picture materials 3.5.1 Head and tail leaders for picture materials shall be in accordance with ISO 4241. 3.5.2 A synchronizing mark, clearly identified as “Head Sync”, shall be placed on the “Picture Gate” frame (frame 192) of the head leader. 3.
43、5.3 The test image referred to in 3.4 shall be located in or before the head leader in a position which ensures that the printing machine has reached full and steady speed when the test image is exposed. It is recommended that the test image replaces from one to six of the head leader frames 97 to 1
44、02. 3.5.4 Additional requirements for head and tail leaders are subject to agreement between the parties involved. 4 Requirements for post-production sound elements 4.1 Cutting and perforating dimensions Cutting and perforating dimensions for 35 mm magnetic recording films shall be in accordance wit
45、h ISO 491 (Type P perforation and 4,75 mm perforation pitch). NOTEThe use of 17,5 mm magnetic film is permissible only by prior agreement between all parties involved. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:53:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 12612:1997 BSI 09-
46、19993 4.2 Position, dimensions and track assignments Position, dimensions and track assignments of sound tracks shall be in accordance with ISO 162 for 35 mm magnetic film and ISO 9525 for 17,5 mm magnetic film. 4.3 Nominal velocity The nominal velocity of 35 mm magnetic sound records shall be in ag
47、reement with the intended projection frame rate of the accompanying picture, normally 24 frames per second which is equivalent to 96 perforation holes per second or approximately 45,6 cm/s. 4.4 Recordings Recordings shall be made on magnetic film containing no splices. No more than two editorial spl
48、ices shall be allowed in any roll of magnetic film. 4.5 Sound records to be interchanged for making monophonic release prints (see clause A.3) By agreement between the parties involved, sound records shall be recorded using a one-track standard on separate magnetic film; a three- or four-track stand
49、ard on a single magnetic film. 4.5.1 Three sound records shall be recorded on a single three-track magnetic film with the following track assignments: Track 1 Dialog record; Track 2 Music record; Track 3 Sound effects record; 4.5.2 Four sound records shall be recorded on a single four-track magnetic film with the following track assignments: Track 1 Dialog record; Track 2 Music record; Track 3 Sound effects record; Track 4 Special components record (see the following note). NOTES