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REPORT OF SUBCOMMITTEE C ON 16-MM LABORATORY
PRACTICE*
M. R. BOYER**
Subcommittee C on 16-Mm Laboratory Practice has been setting up specifications for 16-mm motion picture release prints. As explained previously, these specifications are intended to be War Standards, but many of them will be applicable to peace-time laboratory practice.
To date the Committee has reached agreement on the following items in 16-mm print specifications:
(1) Materials — Fine-grain raw stock is recommended.
(2) Print treatment — Prints shall be treated over the entire width of the emulsion surface to facilitate projection.
(3) Methods of marking prints — A standard of marking prints has been set up so that the location of titles, type of print, and emulsion position will always be noted in the same location.
(4) Physical defects — A separation of well-known defects into tolerable and intolerable classification has been made.
(5) Splices — A standard width has been established, and an allowable number of splices per reel has been decided upon.
(6) Residual hypo content — A method of measuring residual hypo content of prints has been chosen, and the maximum allowable content decided upon. This will probably be changed when permanent standards are set up, as the consensus of opinion was that the allowable hypo content could be greater for war prints than for library prints.
(7) Density and gamma variations — Limits of allowable density and gamma variations from print to print have been established.
On the following points decision has not yet been reached :
(1) Resolution specifications.
(2) Distortion and signal-to-noise ratio — This will probably be
* Presented Apr. 19, 1944, at the Technical Conference in New York. ** Chairman, Subcommittee C, ASA War Committee on Photography and Cinematography-Z52.
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