Journal of the Society of Motion Picture and Television Engineers (1950-1954)

2. Subcommittee on Projection Screens: New industry developments have been announced with such frequency over the past several months as to prevent this group from bringing its work to a conclusion. This group, originally set up to prepare standards of whiteness and brightness of motion-picture screens, will need to consider, in addition to the familiar matte-type screen, the other types of screens which have recently come into prominence. 3. Subcommittee on Illumination Practices: This group has likewise been unable to carry out its assignment due to pressure of other activities. Their task of preparation of recommended practices concerning distribution of illumination on motion-picture screens should be an important future committee activity. 4. Subcommittee on Screen Photometry: This group, recently formed under the chairmanship of Gerhard Lessman has been given the assignment of definition of terms and description of methods necessary for determination of the important photometric characteristics of screens, with special reference to the polarization properties so important to stereoscopic motion pictures. This group has been at work only a short time, but is expected to produce important results. Revision of Screen-Brightness Standard: A revision of American Standard Screen Brightness for 35mm Motion Pictures, originated by the Committee, has recently been approved and issued as PH22.39-1953.4 Screen Brightness for 76mm Laboratory Review Rooms: The Screen Brightness Committee is assisting the Laboratory Practice Committee in the formulation of a standard for the brightness of the screens used for viewing 16mm film prints in the laboratory review rooms. Symposium on Screen Brightness: The Committee sponsored a symposium of five papers presented at the Spring 1953 Convention of the Society in Los Angeles and later published as Part II of the August 1953 issue of the Journal.* These five papers covered such subjects as screen-brightness meters, carbon-arc projection systems, relation of screen brightness to picture quality and the effects of stray light. Conclusion: Although much important and useful information has become available during the past few years, there remains a rich field of activity for the Committee during future years. In addition to the discovery and dissemination of new information, there remains the important task of translating existing knowledge into useful recommendations and standards to improve the quality of motion pictures. References 1. W. W. Lozier, "Screen Brightness Committee Report," Jour. SMPTE, 59: 524-525, Dec. 1952. 2. F. J. Kolb, Jr., "Specifying and measuring the brightness of motion-picture screens," Jour. SMPTE, 61: 533-556, Oct. 1953. 3. Frank F. Crandell and Karl Freund, "New photoelectric brightness spot meter," Jour. SMPTE, 61: 215-222, Aug. 1953. 4. American Standard, Screen Brightness for 35mm Motion Pictures, PH22.391953, Jour. SMPTE, 60: 630, May 1953. 5. Symposium on Screen Brightness (5 papers), Jour. SMPTE, 61: 213-272, Aug. 1953. The Committee W. W. Lozier, H. J. Benham F. E. Carlson M. H. Chamberlin B. S. Conviser Philip Cowett E. R. Geib L. D. Grignon A. J. Hatch, Jr. L. B. Isaac W. F. Kelley F. J. Kolb, Jr. Gerhard Lessman Chairman L. J. Patton O. W. Richards Leonard Satz Ben Schlanger Allen Stimson C. R. Underhill G. H. Walter H. E. White A. T. Williams D. L. Williams J. J. Zaro February 1954 Journal of the SMPTE Vol. 62 163