SMPTE RP 65-2000 Motion-Picture Enlargement Reduction Ratios《影片画幅放大 缩小比》.pdf

1、 STD*SflPE RP bS-ENGL 2000 8357403 0004215 424 W SMPTE RECOMMENDED PRACTICE RP 65-2000 Revision of RP 65-1995 Motion-Picture EnlargemenVReduction Rat os 1 Scope This practice specifies the enlargementreduction ratios to be used in copying motion pictures from one film size to another while maintaini

2、ng the aspect ratio and composition of the original film. This practice also specifies the dimensions of the projectable image area on the resulting copy, and gives the dimensions for a matte which produces an opaque border on the final projection copy. Also specified are dimensions for camera viewf

3、inder Pagel of 3 pages 2 Ratios and dimensions The enlargementreduction ratios and dimensions shall be as given in the tables. All table dimensions are in inches. The centers of the original image, the projectable image area, the matte, the viewfinder marks, and the copy image shall all be coinciden

4、t with the center of the copy format as given in the appropriate referenced standard. When a matte dimension is not given, no matte is required in that direction since the copied image fills the standard image dimension of the copv format. - ._ marks which can be used in composing the onginal photog

5、raphy for the copy format. Table 1 - Reduction from 35-mm to 16-mm From 35-mm projection format 1 to 16-mm projection format 1.37:l 1.66:l 1.85: 1 1.37:l 1.66:l 1.85: 1 1 Reduction ratio 0.461 f 0.002 0.461 I 0.002 0.461 0.002 Projectable image on 16-mm copy Width 0.380 ref 0.380 ref 0.380 ref Heigh

6、t 0.278 nom 0.229 nom 0.206 nom Matte on 16-mm copy Height Viewfinder marks Width 0.825 ref 0.825 ref 0.825 ref for original Height 0.602 ref 0.497 ref 0.446 ref Table 2 - Enlargement from 16-mm to 35-mm _ From 16-mm projection format 1.33:l to 35-mm projection format 1.33:l Enlargement ratio 2.105

7、i 0.002 Projectable image on 35-mm copy Width 0.800 nom Height 0.602 ref + 0.010 Matte on 35-mm copy Width 0.800 - 0.0 Viewfinder marks for original Width 0.380 ref Height 0.286 ref ! Copyright O 2000 by the SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 1

8、0607 (914) 761-1100 Approved ApnI 6,2000 STD-SMPTE RP b5-ENGL 2000 m 8357Y03 00Y2Lb 3b0 RP 65-2000 Table 3 - Enlargement from 35-mm to 70-mm From 35-mm projection format 1.85:1 2.39:l anamorphic to 70-mm projection format 1.85:l 2.39:l flat Enlargement ratio 1.951 k 0.002 1.159 0.002 I Horizontal de

9、compression + 0.0 2oo - 0.03 Projectable image Width 1.610 nom 1.912 ref on 70-mm copy Height 0.870 ref 0.800 nom 1 Matte Width Height Viewfinder marks Width 0.825 ref 0.825 ref for original Height 0.446 ref 0.690 ref Table 4 - Reduction from 35-mm anamorphic to 16-mm anamorphic From 35-mm projectio

10、n format I to 16-mm Droiection format Anamorphic 2.39:l anamorDhic Reduction ratio Projectable image on 16-mm copy Matte Width Height Width 0.41 4 t 0.002) 0.342 nom 0.286 ref + 0.005 0.342 - 0.0 Vie wf i n der mar kc for o rig i na1 Width 0.825 ref Height 0.690 ref ) Some reductions from 35-mm anam

11、orphic to 16-mm anamorphic use the 35-mm to 16-mm reduction ratio given in table 1 (Le., 0.461) and the 16-mm copy is projected using the standard 16-mm projectable area of 0.380 in by 0.286 in, thus projecting only 0.620 in of the vertical information rather than the usual 0.690 in projected in 35-

12、mm. Such practice is, therefore, deprecated. Annex A (informative) Additional data A.l Choke of enlargernenreduction ratios Enlargement/reduction ratios have been calculated, insofar as possible, to fit the entire projectable image area on the original film to the standard projectable image area of

13、the copy format. By so doing, all of the image originally meant to be seen by the audience will be seen when projecting the enlarged or reduced copy. The aspect ratio and the size of the exposed image outside the projectable image area may differ in the original format and the copy format, resulting

14、 in images which do not completely fill the standard image areas of the copy format. These unfilled areas of the copy may occur at the image top and bottom, the sides, or both. A.2 ProJection aperture Because the unfilled areas described in A.l can occur, it is recommended that the projector used fo

15、r showing the copy be fitted with a suitable projection aperture. The dimensions given for the projectable image area can be used as a reference to design a projector aperture suitable to the image size on the final projection copy. A.3 Matte It is recognized that the enlarged or reduced copy may no

16、t be projected with a projection aperture designed specifically for the image size on the copy. Additionally, clear film outside the projected area may cause flare in projection even with a proper aperture. Therefore, a matte of lhe dimensions given in the tables may be required at some point in the

17、 duplication process so as to produce an essentially opaque border surrounding the image area on the final projection copy. The matte is intended to be slightly larger than the appropriate projectable image area so that it will not be seen on the screen when the preferred projector aperture is used,

18、 but if the copy is projected without the preferred projector aperture, essentially the same projected image area will be seen. Page 2 of 3 pages STD-SMPTE RP bS-ENGL 2000 M 8357LiOL OOOLi217 2T7 M RP 65-2000 Annex B (informative) Bibliography ANSVSMPTE 152-1994, Motion-Picture Film (70-mm) - Projec

19、table Image Area ANSIISMPTE 195-1993, Motion-Picture Film (35-mm) - SMPTE 7-1999, Motion-Picture Film (16-mm) - Camera Motion-Picture Prints - Projectable Image Area ANSVSMPTE 215-1995, Motion-Picture Film (65-mm) - SMPTE 59-1998, Motion-Picture Film (35-mm) - Camera Camera Aperture Image ANSIISMPTE 233-1998, Motion-Picture Film (16-mm) - Projectable Image Area and Projector Usage Aperture Image and Usage Aperture Images and Usage Page 3 of 3 pages