ANSI-IT2.37-2001.pdf
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1、American National Standard for Photography - Print Grain Index - Assessment of Print Graininess from Color Negative Film ANSI/I3A IT2.37-2001 ANSI/I3A IT2.37-2001 Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/996103
2、1100 Not for Resale, 05/08/2007 22:49:33 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 22:49:33 MDTNo r
3、eproduction or networking permitted without license from IHS -,-,- ANSI/I3A IT2.37-2001 American National Standard for Photography Print Grain Index Assessment of Print Graininess from Color Negative Film Secretariat International Imaging Industry Association, Inc. (I3A) Approved August 31, 2001 Ame
4、rican National Standards Institute, Inc. Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 22:49:33 MDTNo reproduction or networking permitted without license from IHS -,-,- Approva
5、l of an American National Standard requires review by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgement of the ANSI Board of Standards Review, substantial agreement has been
6、 reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made towards their resolution. The use of American Natio
7、nal Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Standards Instit
8、ute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Requests f
9、or interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be take
10、n periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. American National Standard Published by American National Standards Institute, In
11、c. 25 West 43rd Street, New York, NY 10036 Copyright 2003 by American National Standards Institute, Inc. All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without prior written permission of the publisher. Printed in the U
12、nited States of America Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 22:49:33 MDTNo reproduction or networking permitted without license from IHS -,-,- i Contents Page Foreword
13、ii Introduction .iii 1Scope . 1 2Normative references. 1 3Terms and definitions. 1 4Computational steps. 3 5Summary of procedure to calculate the PGI. 12 6Reporting results 13 Tables 1Channel-dependent numerical factors used in equation (1). 11 2Optical printing magnifications 11 3Visual weighting c
14、oefficients used in equation (6) 12 Annexes ADerivation of the relationship of print granularity to film granularity 14 BBibliography 16 Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08
15、/2007 22:49:33 MDTNo reproduction or networking permitted without license from IHS -,-,- ii Foreword (This foreword is not part of American National Standard ANSI/I3A IT2.37-2001.) The grainy appearance of directly viewed photographic prints, (as opposed to, e.g., the granularity of film negatives,
16、which are not often directly viewed) is often of prima- ry interest in the evaluation of image quality. Because there is a need to evaluate and compare this graininess, there has been a need to specify a standardized meth- od for its assessment. This standard defines “graininess“ and provides an obj
17、ective basis (the “Print Grain Index,“ or PGI) for comparing the graininess of color photographic prints made from color negative films. The method uses the RMS granularity of the color negative film as the input, and computes the PGI for a specified printing magnification. The PGI allows a photogra
18、pher to choose a film, format and printing magnification based on an objective assessment of the resulting perceived graininess in the final print. This standard contains two annexes that are informative and are not considered part of the standard. Suggestions for improvement of this standard will b
19、e welcome. They should be sent to the International Imaging Industry Association, Inc. (I3A), 550 Mamaroneck Ave- nue, Suite 307, Harrison, NY 10528-1612; e-mail: i3astdsi3a.org. This standard was processed and approved for submittal to ANSI by I3A Technical Committee on Image Evaluation, IT2. Commi
20、ttee approval of the standard does not necessarily imply that all committee members voted for its approval. At the time this standard was approved, the IT2 Committee had the following members: Michael R. Goodwin, Chairman Jack Holm, Vice-Chairman Organization RepresentedName of Representative Intern
21、ational Imaging Industry Association, Inc. (I3A) .Sharon Bartels Richard Fisch Michael R. Goodwin Thomas Lumenello Robert A. Uzenoff Robert D. Whittal Paul J. Kane (Alt.) Thomas McKeehan (Alt.) CGATS .Larry Steele Graphic Communication AssociationNorman W. Scharpf Graphic MicrosystemsSteven Headley
22、GTI Graphic Technology, IncCharles G. Saleski Photographic Society of America .Jack Holm Ira Current (Alt.) Professional Photographers of America.Tim Mathiesen Radiological Society of North America .Homer L. Twigg, Jr. Eliot L. Siegel US Department of Commerce - National Institute of Standards and T
23、echnology.Edward A. Early Individual Expert Daniel Sinto Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 22:49:33 MDTNo reproduction or networking permitted without license from I
24、HS -,-,- iii Introduction RMS-granularity is a useful measure of the microdensity fluctuations present in an area of uniform exposure on a photographic film. These fluctuations arise from the random distribution of silver halide grains present in the original photographic layers. It has been shown t
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