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504 XIV. DUPLICATION OF TRI-PACK COLOR FILMS
future 16-mm market with Kodachrome. The color printing techniques are similar. With good sensitometric control, color development should not encounter any very serious obstacles, although most prospective users will have to begin to learn what quality control and process control really mean if they hope to be commercially successful. This is a very real and serious problem ; even the most optimistic of us would hardly dare to say that good control has been widely achieved when we screen prints of 16mm black-and-white films.
The second imponderable is sound. The sound quality available with present-day Kodachrome does not compare with the quality obtainable under properly controlled conditions with high resolving power films, such as the blue-dyed EK 5372 or the yellow-dyed EK 5365. (The rated resolving power of both is 150 lines per millimeter.) Bruno does not hold much hope for conventional methods of improvement when he states that both Ansco Color Film and Kodachrome exhibit resolving power of the order of 40 lines per millimeter. It would seem that the difference between Bruno's measurements and the Kodak rating of 75 lines per millimeter can be attributed to a difference in measuring technique. It would be desirable to evolve some empirical method for evaluating resolving power. This would avoid apparent discrepancies ; to paraphrase Mark Twain, "An argument arises when two people use the same words to describe different things.' ' Possibly two figures might be established : one representing the performance of the picture portion of the film (this could establish agreement upon a single visual method), and the other representing the performance of the sound portion of the film. It would seem that the sound art has already reached the point where some such evaluation method could be used for expressing the performance of a sound record when scanned by the scanning beam of a representative projector. Such evaluations would be useful in comparing the performance of black-and-white with color film ; a standard projector will project either.
Gorisch and Gorlich discussed some of the criteria for a satisfactory sound track on multilayer films and reported upon some of their tests. Their conclusion is significant: that the usual caesium-surface photoelectric cell is well suited to the reproduction of silver-emulsion films, but should be modified with antimony if it is to reproduce dyed films satisfactorily. No doubt much undisclosed progress has already been made in making the cell to fit the film and the film to fit the cell. While the general trends that the characteristics should take seem indicated, the