ISO 2907-2002 Cinematography - Maximum projectable image area on 35 mm motion-picture film - Position and dimensions《电影技术 在35mm电影胶片上可放映的最大影象区 位置和尺寸》.pdf

1、 Reference number ISO 2907:2002(E) ISO 2002INTERNATIONAL STANDARD ISO 2907 Third edition 2002-08-15 Cinematography Maximum projectable image area on 35 mm motion-picture film Position and dimensions Cinmatographie Surface maximale projetable pour une image sur film cinmatographique 35 mm Position et

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11、nsible for identifying any or all such patent rights. ISO 2907 was prepared by Technical Committee ISO/TC 36, Cinematography. This third edition cancels and replaces the second edition (ISO 2907:1984), which has been technically revised. INTERNATIONAL STANDARD ISO 2907:2002(E) ISO 2002 All rights re

12、served 1Cinematography Maximum projectable image area on 35 mm motion-picture film Position and dimensions 1 Scope This International Standard specifies the maximum dimensions of the film image area intended for projection from a 35 mm motion-picture film and the position of this area relative to th

13、e perforations and the reference edge of the film. This International Standard specifies three types of image areas intended for theatrical projection (see A.4 in informative annex A): Style A: general theatrical release prints commonly referred to as non-anamorphic or wide screen; Style B: theatric

14、al release prints with an anamorphic image; Style C: classic theatrical prints. 2 Position and dimensions of image area The dimensions shall be positioned as shown in Figure 1, and as specified in Table 1. NOTE 1 Dimensions B, D, and E define the image area on the film that is available for projecti

15、on. They do not define the opening in the projection-aperture plate. The size of this opening may differ from dimensions A and B, for example, because of the physical separation necessary between the aperture plate and the film to avoid scratching the film, the slant of the marginal rays accepted by

16、 the projection lens, etc. NOTE 2 It is recognized that, in many cases, the actual film image area that is projected may be smaller than the projectable maximum and, in some cases, may be non-rectangular (for example, an irregular four-sided figure bound by either straight or curved lines). Such dep

17、artures may result from the following: equipment considerations, such as slight inconsistencies among lenses, screen sizes, etc.; geometric limitations, such as the screen surface being at an angle other than 90 from the projection axis, or being non- planar or both; aesthetic considerations, such a

18、s pictorial composition within more restrictive image limits. In the absence of specific instructions to the contrary, it is intended that the actual projected film image area be the largest appropriately shaped figure that can be inscribed within the specified dimensions. ISO 2907:2002(E) 2 ISO 200

19、2 All rights reservedKey 1 Film image area 2 Projectable image area 3 Direction of film travel 4 Reference edge View as seen through film towards lens. Figure 1 Projectable image area ISO 2907:2002(E) ISO 2002 All rights reserved 3Table 1 Dimensions of projectable image area Dimensions mm in A 20,95

20、 0,825 B (style A) 11,32 min.; 12,70 max. 0,446 min.; 0,500 max. B (style B) 17,53 max. 0,690 max. B (style C) 15,29 nom. 0,602 nom. Ca18,75 ref. 0,738 ref. D 8,23 min. 0,324 min. E 29,24 max. 1,151 max. F = H within 0,30 within 0,012 J = K approximately equal approximately equal a See A.1. ISO 2907

21、:2002(E) 4 ISO 2002 All rights reservedAnnex A (informative) General Information A.1 Centrelines The centrelines of the image area are given for convenience in interpreting this International Standard, facilitating such applications as the optical design of equipment, and assisting in the understand

22、ing of suitable mechanical embodiments related to the projectable image area. Note that the centreline of the projectable image area is displaced from the centreline of the film by 1,27 mm (0,050 in) nominal. A.2 Related International Standards ISO 23 and ISO 2906 define image areas for other import

23、ant phases of motion-picture operations and are consistent with this International Standard and with one another under currently acceptable commercial practices. A.3 Image area for television It is recognized that home television receivers are adjusted to show a distribution of picture sizes ranging

24、 downward from the maximum. Guides to picture composition, based upon a statistical survey of receivers in use, are presented in SMPTE RP 27.3. Note that a certain portion of the audience will see the entire transmitted area, but for certainty in presentation of critical information over broadcast t

25、elevision, such information should be confined to a smaller, central area. A.4 Typical aspect ratios for non-anamorphic theatrical projection For aesthetic and practical reasons, theatrical projection may present 35 mm images in such a manner that the full width of the projectable area is shown but

26、the projected height is less than maximum. Photography designed primarily for theatrical exhibition recognizes this and is composed for the more elongated rectangles. Several aspect ratios for the final projected picture are recognized through usage. To help ensure correct vertical centring (framing

27、) of the projected image, hard-matte printing may be used in producing the duplicate negative used for release printing of theatrical prints. A hard matte with an image height of at least 12,83 mm (0,505 in) may be used for all style A aspect ratios (1,66:1 or greater). Note that prints intended for

28、 a style C aspect ratio (1,37:1) will normally have an image height of at least 16,00 mm (0,630 in) as specified in ISO 2906. In all cases, the frame lines on the print shall essentially be opaque. It is recommended that pictures designed to be shown at aspect ratios other than those specified in th

29、is International Standard be so marked in a conspicuous manner. The leader (described in ISO 4241) provides for aspect-ratio identification on frames 29-30. ISO 2907:2002(E) ISO 2002 All rights reserved 5Table A.1 Non-anamorphic aspect ratios Projectable image height Style Aspect ratio mm in A 1,85:

30、1 11,32 min. 0,446 min. A 1,66:1 12,62 ref. 0,497 ref. A 16:9 (1,78:1) 11,78 nom. 0,464 nom. C 1,37:1 15,29 nom. 0,602 nom. NOTE Based on common image width A = 20,95 mm (0,825 in). A.5 Image area on original negative The use of camera-aperture dimensions other than those stated in ISO 2906 is disco

31、uraged. Film users are reminded that many features composed for wide-screen aspect ratio will be shown later on television. Use of a hard matte in the camera will require substantial cropping of the film horizontally when the film is transferred to television, and severely limits the use of a print

32、made from the negative. Good practice dictates using the 1,37:1 style A camera aperture given in ISO 2906, while composing for the desired theatrical-projection aspect ratio. Care should be taken to exclude extraneous items or action from the photographed image area which may show in the television

33、scanned area. A.6 Image steadiness The image steadiness can be improved if the reference edge is also the guided edge. ISO 2907:2002(E) 6 ISO 2002 All rights reservedBibliography 1 ISO 23:1993, Cinematography Camera usage of 35 mm motion-picture film Specifications 2 ISO 491:2002, Cinematography 35

34、mm motion-picture film and magnetic film Cutting and perforating dimensions 3 ISO 2906:2002, Cinematography Image area produced by camera aperture on 35 mm motion-picture film Position and dimensions 4 ISO 2939:2002, Cinematography Picture image area on 35 mm motion-picture release prints Position a

35、nd dimensions 5 ISO 4241:2001, Cinematography Theatre projection leader, trailer and cue marks Specifications 6 ANSI/SMPTE 111-1996, Motion-Picture Film (35-mm) Prints Made on Continuous Contact Printers Exposed Areas for Picture and Audio 7 SMPTE 55-2000, Motion-Picture Film 35- and 16-mm Audio Rel

36、ease Prints Leaders and Cue Marks 8 SMPTE 59-1998, Motion-Picture Film (35-mm) Camera Aperture Images and Usage 9 SMPTE 195-2000, Motion-Picture Film (35-mm) Motion-Picture Prints Projectable Image Area 10 SMPTE RP 27.3-1989, Specifications for Safe Action and Safe Title Areas Test Pattern for Television Systems ISO 2907:2002(E) ICS 37.060.20 Price based on 6 pages ISO 2002 All rights reserved