1、 Copyright 2014 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 3 Barker Avenue, White Plains, NY 10601 (914) 761-1100 Approved November 13, 2014 Table of Contents Page Foreword . 2 Intellectual Property 2 1 Scope . 3 2 Conformance Notation . 3 3 Normative References . 3 4 Test Film Prints
2、 3 5 Dimensions 6 Annex A Control of Resolution and Definition in the Preparation of Test Prints (Informative) 9 Annex B Bibliography (Informative) . 10 SMPTE RP 91:2014 Revision of RP 91-2002 Specifications for 70-mm Projector Alignment and Screen Image Quality Test Film SMPTE RECOMMENDED PRACTICE
3、Page 1 of 10 pages SMPTE RP 91:2014 Page 2 of 10 pages Foreword SMPTE (the Society of Motion Picture and Television Engineers) is an internationally-recognized standards developing organization. Headquartered and incorporated in the United States of America, SMPTE has members in over 80 countries on
4、 six continents. SMPTEs Engineering Documents, including Standards, Recommended Practices, and Engineering Guidelines, are prepared by SMPTEs Technology Committees. Participation in these Committees is open to all with a bona fide interest in their work. SMPTE cooperates closely with other standards
5、-developing organizations, including ISO, IEC and ITU. SMPTE Engineering Documents are drafted in accordance with the rules given in its Standards Operations Manual SMPTE RP 91 was prepared by Technology Committee 20F. Intellectual Property At the time of publication no notice had been received by S
6、MPTE claiming patent rights essential to the implementation of this Recommended Practice. However, attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. SMPTE shall not be held responsible for identifying any or all such patent rights.
7、SMPTE RP 91:2014 Page 3 of 10 pages 1 Scope This practice specifies a test film for quantitative measurements of 70-mm projector alignment and screen image quality. This practice also describes the artwork and dimensions for a test chart to be used as the original subject for the manufacture of a ma
8、ster negative. 2 Conformance Notation Normative text is text that describes elements of the design that are indispensable or contains the conformance language keywords: “shall“, “should“, or “may“. Informative text is text that is potentially helpful to the user, but not indispensable, and can be re
9、moved, changed, or added editorially without affecting interoperability. Informative text does not contain any conformance keywords. All text in this document is, by default, normative, except: the Introduction, any section explicitly labeled as “Informative“ or individual paragraphs that start with
10、 “Note:” The keywords “shall“ and “shall not“ indicate requirements strictly to be followed in order to conform to the document and from which no deviation is permitted. The keywords, “should“ and “should not“ indicate that, among several possibilities, one is recommended as particularly suitable, w
11、ithout mentioning or excluding others; or that a certain course of action is preferred but not necessarily required; or that (in the negative form) a certain possibility or course of action is deprecated but not prohibited. The keywords “may“ and “need not“ indicate courses of action permissible wit
12、hin the limits of the document. The keyword “reserved” indicates a provision that is not defined at this time, shall not be used, and may be defined in the future. The keyword “forbidden” indicates “reserved” and in addition indicates that the provision will never be defined in the future. Unless ot
13、herwise specified, the order of precedence of the types of normative information in this document shall be as follows: Normative prose shall be the authoritative definition; Tables shall be next; followed by formal languages; then figures; and then any other language forms. 3 Normative References Th
14、e following standards contain provisions that, through reference in this text, constitute provisions of this recommended practice. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this recommended practice are en
15、couraged to investigate the possibility of applying the most recent edition of the standards indicated below. SMPTE ST 119:2011, Motion-Picture Film (70-mm) Perforated 65-mm, KS-1870 SMPTE ST 185:2011, Motion-Picture Film (70-mm) Six Magnetic Records on Release Prints Position, Dimensions, Reproduci
16、ng Speed and Identity 4 Test Film Prints 4.1 A reproduction of the test chart is shown in Figure 1. 4.2 The positive resolution charts are modified NBS resolution test charts with a luminance ratio of 100:1 (see Figure 2). SMPTE RP 91:2014 Page 4 of 10 pages 4.3 The area between the logos (SMPTE and
17、 70-PA) is to be used to insert a gray patch, if necessary, as a densitometric control in the exposure and processing of the original negative and subsequent prints. 4.4 The test film shall be produced as a 70-mm print with a neutral image on color positive film manufactured in accordance with SMPTE
18、 ST 119. 4.5 The print shall be made of polyester non-shrink stock. 4.6 The printing shall be chosen so that, after processing, there is cancellation of the image spread in the resolution targets specified in Section 4.2 at 80 lines per millimeter. If used, the gray patch density will provide a conv
19、enient densitometric control in the exposure and processing after the characteristics of the system have been established. 4.7 The method of printing shall produce less than 0.20% (arbitrary) vertical image unsteadiness on the test print. 4.8 If the print contains magnetic stripes, they shall be in
20、accordance with SMPTE ST 185. SMPTE RP 91:2014 Page 5 of 10 pages Figure 1 Reproduction of test chart SMPTE RP 91:2014 Page 6 of 10 pages 5 Dimensions 5.1 The dimensions of the original test chart shall be 25X the dimensions given in Table 1. This precise requirement is necessary because the NBS res
21、olution test charts are designed for a 25X reduction. For practical purposes, a smaller original chart can be prepared provided that the NBS resolution charts can be accurately reduced in size by a known ratio which shall then apply to all the other dimensions on the test chart. 5.2 The modified NBS
22、 resolution test chart shall be placed on the original test chart as specified by the dimensions in Figure 3. 5.3 The densitometric control area specified in Section 4.3 shall be not less than 0.2” x 0.2” (5.08 mm x 5.08 mm) on the 70-mm film. 5.4 The gray patches, along with the SMPTE logo, should
23、be placed midway between the horizontal centerline and the top and bottom of the test chart. 5.5 The checkerboard background shall contain 100 squares vertically and 220 squares horizontally. 5.6 The dimensions marked with an asterisk in the table shall be within tolerances of 0.002 in (0.05 mm) on
24、the print. All other dimensions are nominal. Figure 2 Resolution chart SMPTE RP 91:2014 Page 7 of 10 pages Table 1 Dimensions Dimensions Inches Millimeters A* B* C* D E F G H J* K L M N O* P Q* R* S* T U V W 1.912 0.870 0.956 0.946 0.600 0.478 0.300 0.125 0.435 0.425 0.275 0.130 0.045 0.022 0.096 0.
25、048 0.086 0.151 0.215 0.2 0.560 0.155 48.56 22.10 24.28 24.03 15.24 12.14 7.62 3.18 11.05 10.80 6.98 3.30 1.14 0.56 2.44 1.22 2.18 3.84 5.46 5.08 14.22 3.94 *See Section 5.6 for tolerances. SMPTE RP 91:2014 Page 8 of 10 pages Figure 3 Test chart dimensions SMPTE RP 91:2014 Page 9 of 10 pages Annex A
26、 Control of Resolution and Definition in the Preparation of Test Prints (Informative) A.1 It has been found that producing test prints with resolution at 80 lines per millimeter requires careful selection of the materials and equipment used, and careful control of the operations. Inasmuch as a measu
27、ring tool should be better than the system it is designed to measure, it is desirable that the test film meet the specifications detailed herein. A.2 The background checkerboard pattern provides for a 50% transmission of the incident radiant energy so as to be more nearly consistent with the project
28、ion performance of an average release print. A.3 Image densities referred to in this annex are intended for a more precise definition of one system shown to be applicable, and are measured in accordance with ANSI/NAPM IT2.19. Selection of a film for producing the negative must take into consideratio
29、n image spread characteristics such that, in conjunction with the print films at image densities that are useful, there is substantial image spread cancellation in the resolution range of interest. Accordingly, the final print will resolve 80 lines per millimeter with the lines and spaces equal in w
30、idth. A.4 Selection of a film for producing the dye-image print must take into consideration not only the requirements of Section 4.6, but also image spread characteristics compatible with the negative and projection characteristics suitable for theatrical projection. A.5 Preparation of the test pri
31、nts with a resolution and steadiness adequate for the films purpose requires great care in the selection and operation of the printer. Satisfactory results can be obtained only with a step-contact printer employing registration pins. SMPTE RP 91:2014 Page 10 of 10 pages Annex B Bibliography (Informative) ANSI/NAPM IT2.19-1994, Photography Density Measurements Part 2: Geometric Conditions for Transmission Density
