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BRITISH K1NEMATOGRAPHY
Vol. 16, No. 3
large when made to accommodate 1,000 ft. rolls of stock. On the other hand, the wastage of stock due to short ends and loss of time due to frequent re-threading is a serious disadvantage of the smaller magazine. Cinecolor have met this difficulty by designing a " side-by-side " magazine and adaptor to accommodate 1,000 ft. rolls of bipack negative.11
Mention of Cinecolor as a two-colour process has taken me beyond reference to the chart, and I must end this report before I run the risk of confusing you, and myself, by discussing either of the stripping tripacks which are still being developed in America or the several two and " two-and-a-half colour " processes recently publicised in our own technical press.
I will conclude, therefore, by inviting you to deduce from this progress report that contrary to perennial reports of processes which will reduce colour to the simplicity of normal black and white work, processing laboratories must be prepared to accept new responsibilities and to overcome many difficulties before any colour process can be operated successfully.
REFERENCES
l.See also Proc. B.K.S. Film Prod. Div., 54, No. 1, Jan., 1950, p. 35. 1945/6, p. 15.
2. Brit. Pat. 604,256.
3./. Soc. Mot. Pic. Eng., June, 1948, p. 543. Brit. Kine., 11, No. 4, Nov., 1947, p. 142.
4. Brit. Kine., 11, No. 4, p. 142.
5. /. Soc. Mot. Pic. Eng., 53, No. 1, Jan., 1949, p. 3.
6. /. Soc. Mot. Pic. Eng., 38, No. 2, Feb., 1942, p. 148. See also /. Soc. Mot. Pic. Eng.,
7. Brit. Pat. 599, 377.
8. Brit. Pat. 595,375. J. Soc. Mot. Pic. Eng., 18, No. 5, Apr., 1932, p. 503.
9. /. Soc. Mot. Pic. Eng., 52, No. 4, Apr., 1949, p. 447. '
10. See also /. Soc. Mot. Pic. Eng., 54, No. 1, Jan., 1950, p. 74.
11./. Soc. Mot. Pic. Eng., 53, No. 1, July, 1949, p. 58.
DISCUSSION
Mr. Gaber : Could you tell us a little about the new Italian process ?
Mr. Wyn Griffith : Italcinecolor uses a single 35-mm. negative. In front of the film is an optical system which takes the real image formed by an ordinary objective, splits it and passes it through four colour filters — red, green, yellow and blue. The four images are reduced to the size of a 16 mm. frame and are positioned within the area of a normal 35 mm. frame. The single black-and-white strip containing the separation images can be projected by a similar optical system in full colour ; it can also be printed on to coloured stock to give a print that can be projected with ordinary projectors.
The inventor stated that he had overcome the problems of parallax from which Rouxcolor suffered.
The Author : The process is almost exactly the same as an American process known as Thomascolor. In all probability the images
are not parallax free and furthermore there would be difficulty in retaining register even assuming that theatres installed suitable projection equipment.
Mr. Scott Mulloch : Is there any possibility of Dufaychrome coming out as 16 mm. stock?
The Author : Dufaychrome is a process which is just as workable on 16 mm. as on .35 mm. providing you have suitable printing and processing equipment. We are building it and hope to use it for both.
Mr. W. Lassally : Regarding Dupont release materials how do you obtain a colour reproduction if the colour of the printing light is not complementary to the corresponding separation negative?
The Author : Each separation negative is printed through a colour filter so that the negative record corresponding to each of the positive image layers is located in the appropriate image layer.
BRITISH STANDARD
B.S. 1592-1949 : Camera Shutters. Relates to shutters for still cameras only. Part I deals with inter-lens shutters and behind-the-lens shutters, Part II with focalplane shutters, Part III with synchro-flash mechanism, and Part IV with cable-release sockets. Appendices describe methods of testing shutters.
AMERICAN STANDARDS
American standards have been issued for
two 35 mm. sound test films, as follows : — Z22.61-1949 : Sound focusing test film for 35 mm. Motion Picture Sound Reproducers {service type). A 7,000 c/s variable area track is specified, recorded 1 db. below 100 per cent, modulation ; variation in power level shall not exceed ± 0.25 db.
Z22.68-1949 : Buzz-track Test Film for 35 mm. Motion Picture Sound Reproducers. On either side of a 0.288 in. opaque track are square-wave recordings, on one side 300 c/s and on the other side 1,000 c/s.