1、 1 Scope 1.1 This practice specifies the subject material and the dimensions and location of the subject material for an 8-mm type R test film of high accuracy to assist the user in achieving several quantitative visual tests (see annex A.1). 1.2 The film can be used to test motion-picture projector
2、s and printers. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this practice. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on th
3、is practice are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. ANSI/SMPTE 234-1998, Motion-Picture Film (8-mm Type R) Projectable Image Area and Projector Usage SMPTE 231-1999, Motion-Picture Film (8-mm Type R) Camera Aperture Image an
4、d Usage SMPTE 239-1999, Motion-Picture Film (16-mm) Perforated 8-mm Type R, 2R 3 Dimensions The dimensions and location of the target areas shall be as specified in the figures. The patterns in figures 3 and 4 appear in the five circular areas of the test pattern shown in figures 1 and 2. 4 Descript
5、ion 4.1 The test film shall be produced as a camera original film photographed on high-contrast, high-definition, positive-type motion-picture stock made in accordance with SMPTE 239. 4.2 The diffuse density of the background area shall be 1.80 0.10. 4.3 The camera and projector image areas shall be
6、 in accordance with SMPTE 231 and ANSI/SMPTE 234. Page 1 of 4 pages RP 19-2003 Revision of RP 19-1995 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 RECOMMENDED PRACTICE Specificati
7、ons for 8-mm Type R Registration Test Film RP 19-2003 Page 2 of 4 pages 4.4 The resolution targets shall be photographed in a magnification which results in the concentric rings reading in lines per millimeter on the film (20, 30, 40, 50, and 60). The rosette in the center shall indicate a measureme
8、nt from 60 to 240 lines per millimeter (see annex A.6). NOTE A test film made in accordance with this practice is available from the Society of Motion Picture and Television Engineers. Figure 1 Test pattern dimensions Figure 2 Reproduction of test pattern RP 19-2003 Page 3 of 4 pages Figure 3 Enlarg
9、ement of target area Figure 4 Enlargement of rosette Annex A (informative) Additional data A.1 Visual tests The following quantitative visual tests can be performed: Tests Projector Printer Contact Continuous Step Optical Step Steadiness (jump and weave) X X* X X Aperture alignment X X X X Double-ex
10、posure alignment X X X Shutter adjustment (travel ghost) X X Framing accommodation X X Focus X XResolution X X X X Field flatness X X X X *The perforation pitch of the test film is not optimum for continuous contact printers and its value for this purpose may be limited. A.2 Magnification If the ima
11、ge of the test film target is projected to 30 in 40 in (762 mm 1016 mm), it will be enlarged 230 times. RP 19-2003 Page 4 of 4 pages A.3 Jump and weave The triangular areas in the centers of the vertical and horizontal framelines can be used to measure jump and weave and aperture misalignment. Each
12、line in these areas is 0.001 in (0.03 mm) wide. The lines are spaced 0.001 in (0.03 mm) apart. A.4 Aperture centering and size The inner rectangle represents the nominal projectable area. A.5 Travel ghost The white blocks are 0.005 in (0.13 mm) square and will quickly indicate travel ghost caused by
13、 incorrect shutter adjustment. They also provide a quick check on the ability to frame above and below center position. Travel ghost is a blurring effect seen on the screen and evidenced by vertical tails or light streaks added to the projected images of the more transparent areas on the test film.
14、It is caused by the projector shutter being out of synchronism with the intermittent mechanism. If the ghost is above the blocks, the shutter closes late; if the ghost is below the blocks, the shutter opens early. A.6 Resolution Resolving power in lines per millimeter can be read directly from the t
15、est target to the limit permitted by the film stock used. Resolution targets are spaced one in the center and one in each of the four corners. The outside diameter of the target on the film is 0.050 in (1.27 mm) and will fill the area covered by an average microscope using a 10X objective (see 4.4).
16、 A.7 Field flatness Side-to-side out-of-focus is determined from the difference in softness of the sides. Quantitative differences can be determined from resolution charts. Circle charts at the middle of the field permit quick focus adjustment and detection of in- and out-of-focus effects. A.8 Strip
17、ing The user may apply magnetic record and balance stripes to this film by post-process means. If this is done, the dimensions of the film image should be checked to determine if change has been produced by the striping process. It is anticipated that striping will not affect significantly the performance of the test film. However, the user is cautioned that the proximity of the film image to the limiting aperture may be altered due to striping thickness. Also, the frictional characteristics of the test film may be changed, which could affect film transport in the users apparatus.
