British Kinematography (1947)

L49 satisfactory intermediate duplicates, than the Agfacolor negative-positive method as it was used in Germany. In the future, it appears probable that a combination of reversible and negative and positive films will be utilised to give the combined advantages of both methods. In any case, the motion picture industry can look forward to integral tripack colour films which they can process and print in their own laboratories with a minimum of special equipment, and which utilise techniques that can be readily mastered by personnel already skilled in the production of blackand-white motion pictures. I believe we can all look forward to continued advances in colour photography, and the day when all motion pictures will be in colour is no longer in the far distant future. REFERENCES 1. J. Brit. Kine. Soc. July/Sept., 1946. p. 90. 2. S.M.P.E. paper. (Not yet published ) 3. /. Soc. Mot. Pic. Eng. Nov., 1945, p. 313. 4. /. Soc. Mot. Pic. Eng. May. 1946, p. 387. DISCUSSION Mr. F. G. Ginn : Did I understand you to say that for making release prints, you could use either a coloured master copy or a black-and-white successive-frame copy ? The Author : Yes ; you could use either. Mr. Gunn : Which is the preferred method? The Author : We feel that the multilayer film used throughout is perhaps the preferred method. The separation process takes quite a lot of film, and special equipment. The use of a dupe negative which can be printed on a high-speed continuous printer, where the corrections are made in the dupe negative, is much more desirable. Mr. F. Rodker : How does the cost compare with other colour systems ? The Author : I would not like to make comparisons. In the United States we are selling camera film on nitrate base for 12 cents a foot ; we are selling duplicating film on nitrate base at 6 cents a foot, and the printing film at 5J cents. The processing costs will vary, but there are firms who are handling the processing at about 2 or 2£ cents a foot. Mr. I. D. Wratten : I should have thought that the costs of lighting, in view of the Weston reading of 8, and the colour temperature requirements, would be quite high. The Author : We hope to have a Weston reading of 12 to 20. Our latest amateur film has a reading of 10. Mr. F. Bush : When is the stock likely to be available for the production of feature pictures ? The Author : That depends upon how soon we can build the plant. Ansco Color Film goes through the coating machine five times, so the same machine that will give a million feet of black-and-white film will only give 200,000 feet of colour film. Mr. Gunn : I take it the professional camera film is made for two colour temperatures ? The Author : Our daylight stock is made to work at 5,200° K. It is the desire of every producer to eliminate arc lamps and use incandescents. The amount of heat for the ergs of light energy on the set make it desirable to use carbon lighting unless there is some other form of light of that colour temperature which will give less heat. Mr. Cherman : Is reduction printing from 35 mm. for 16 mm. release feasible ? The Author : Yes ; it is very simple. Mr. «B. C. Sewell : Is the signal-to-noise ratio as high with the dye track as with a silver track? The Author : It is apparently equal with the IP-37 tube. Mr. Gunn : Would rushes be in colour or black-and-white ? Is it expensive or inexpedient to give coloured rush prints? The Author : I think colour is desirable. Alternatively, we can make coloured prints in 24 hours from the time the film is delivered to us. The expense is not very high. Mr. B. C. Sewell : Is the camera film lower in contrast ? The Author : Yes, much lower in contrast ; and it has a bluish tinge. Mr. Gunn : The cutter has to start assembling and editing ; he needs something more than the camera film. The Author : As a practical method we would make rush prints on reversible stock. Mr. J. Coote : Could Mr. Williford tell us whether he controls processing sensitometrically or chemically ? The Author : It is controlled by chemical analysis, as well as sensitometrically.