SMPTE ST 152-2003 Motion-Picture Film (70-mm) - Projectable Image Area.pdf

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1、 1 Scope This standard specifies the maximum dimensions of the film image area intended for projection from a 70-mm motion-picture film, and the placement of this area relative to the perforations and the reference edge of the film. 2 Dimensions The dimensions shall be as given in figure 1 and table

2、 1. 3 Relationship to other standards This standard may be used as the basis for establishing picture areas from original photography for final viewing because it presents a description of the picture area on the projection print that is usable for the indicated purposes of the print (which is of pr

3、imary importance because the projection print is the most commonly interchanged item). (See annex A.2.) NOTES 1 Camera and printer apertures. The actual image on the film is significantly larger than the maximum area intended for projection, so that in placement of the images throughout the sequence

4、 of films the tolerance is not restrictive of commercial practice. Upper limits have been established through consideration of good practice in avoiding frame overlap, encroachment upon areas reserved for audio records, flare from perforation edges, etc. Lower limits are similarly related to the avo

5、idance of image effects at a defined edge, tolerances in film positioning, etc. 2 Projector aperture. Dimensions B, D, and E define the maximum image area on the film that is available for projection. They do not define the opening in the aperture plate of a projector. The size of this opening may d

6、iffer 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 the projection lens, etc. 3 Actual projected area. It is recognized that, in many cases, the actua

7、l film image area that is projected may be smaller than the projectable maximum and, in some cases, may be nonrectangular (for example, an irregular four-sided figure bound by either straight or curved lines). Such departures may result from equipment considerations, such as slight inconsistencies a

8、mong lenses, screen sizes, etc.; from geometric limitations such as the screen surface being at an angle other than 90o from the projection axis, or being nonplanar, or both; and from aesthetic considerations such as pictorial composition within more restrictive image limits. In the absence of speci

9、fic 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. 4 Film perforations. Film intended for projection with this image is normally perforated as specified in SMPTE

10、119. Page 1 of 2 pages SMPTE 152-2003 Revision of ANSI/SMPTE 152-1994 Copyright 2003 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1100 Approved October 20, 2003 SMPTE STANDARD for Motion-Picture Film (70-mm) Projectable Image Area

11、SMPTE 152-2003 Page 2 of 2 pages Figure 1 Projectable area on film as seen looking through the film toward the lens Table 1 Specifications Dimensions Inches Millimeters A 1.912 nom 48.56 nom B 0.870 max 22.10 max C 1.377 ref 34.98 ref D 0.420 min 10.67 min E 2.334 max 59.28 max F = H within 0.008 wi

12、thin 0.20 J = K nominally equal nominally equal Annex A (informative) Additional data A.1 Centerlines The centerlines of the image are given for convenience in interpreting the standard, facilitating such applications as the optical design of equipment, and assisting in the understanding of suitable

13、 mechanical embodiments related to projectable image area. A.2 Projectable image area Essentially, the entire image within the maximum established by this standard will be transferred in such operations as reduction printing and other indirect uses of the picture information. Since the entire area will be presented, it is important that the projectable area include only material that meets recognized standards for technical and artistic excellence. Annex B (informative) Bibliography SMPTE 119-1999, Motion-Picture Film (70-mm) Perforated 65-mm, KS-1870