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Screen Brightness Committee Report
By W. W. LOZIER, Committee Chairman
A HE LAST REPORT of the Screen Brightness Committee presented at the April 1950 meeting of the Society1 related a number of items receiving the attention of the committee. This report will summarize our progress to date and will outline some of our future plans.
7. Subcommittee on Meters and Methods of Measurement: This group under the chairmanship of F. J. Kolb, Jr., has made a thorough study of the measurement of screen brightness and related factors. Specifications have been set up on the range of the variables which will need to be covered by various types of instruments. The report by this Subcommittee has been accepted by the Screen Brightness Committee and recommended for early publication in the Journal.
2. Subcommittee on Projection Screens: This group under the chairmanship of Leonard Satz is engaged in the preparation of standards covering the brightness and whiteness characteristics of motion picture screens. The old War Standards of 1945 are being used as a basis of departure.
3. Subcommittee on Illumination Practices: This is a new group recently set up under the chairmanship of A. J. Hatch, Jr.,
Presented on October 9, 1952, at the Society's Convention at Washington, D.G., by W. W. Lozier, National Carbon Company, Division of Union Carbide and Carbon Corp., Fostoria, Ohio.
for the purpose of establishing recommended practices concerning distribution of illumination on the motion picture screens.
Theater Survey of Screen Brightness: The Committee has completed a survey of screen brightness and related information in 125 indoor theaters widely distributed over the United States and in 18 West Coast studio review rooms used for viewing 35mm motion pictures. These data have been reported at the two 1951 meetings of the Society,2*3 and have been published in the Journal. This survey has given us a good summary of screen illumination practices in a representative cross-section of the theaters in this country. This information is being used in our further activities looking toward improvement of theater screen illumination.
The Committee hopes to survey a number of representative outdoor theaters during 1953 to obtain information on screen illumination practices in these installations.
Revision of Screen Brightness Standard: The currently applicable American Standard on Screen Brightness, Z22.391944, has been modified4 to include only indoor theaters and therefore exempts outdoor theaters from the provisions of this Standard. The revised standard has been recommended to the ASA for adoption as an American Standard.
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December 1952 Journal of the SMPTE Vol. 59