British Kinematography (1948)

119 Acknowledgments In the preparation of this paper a considerable literature has been drawn upon, and the author's acknowledgments are due to all those who have published information on the subjects which have been included ; also to friends and colleagues at Denham and elsewhere, who have contributed information and slides. Finally, he is grateful to the Directors of Denham Laboratories, Limited, for permission to prepare and present this paper, and in particular to Mr. W. M. Harcourt, F.B.K.S., F.R.P.S., for his advice and encouragement. REFERENCES 1. Senior, D. A., and Wells, A. A., Phil. Mag., 37, 463, July, 1946. 2. Rowe, F. M., Colour Index, Soc. Dyers and Colourists, 1924. 3. Tull, A. G., Phot. J., 85B, 13-24, Jan., 1945. 4. Planck, M., Die Theorie der Warmestrahlung, 2nd Edn., Leipzig, 1913. 5. Feer, A., Diet, of Phot., 6th Edn., 1895. 6. Green, Cross and Bevan, B.P. 7453, 1890. 7. Flannery, F. E., and Collins, R. B., Phot. J., 86B, 86-90, July, 1946. 8. B.P. 307,659. 9. Mees, C. E. K., Phot. J., 82, August, 1942. 10. Fischer, R., G.Pp. 253335 and 257160. 11. F.I.A.T. Final Reports Nos. 721 and 976. H.M.S.O. /. Brit. Kine. Soc., 9, p. 90, July, 1946. 12. Gorisch and Gorlich, /. Soc. Mot. Pic. Eng., 43, 206, Sept , 1944. Phyfe, J. D., /. Soc. Mot. Pic. Eng., 46, 405. May, 1946. 13. Atkinson and Shaner, /. Soc. Mot. Pic. Eng., 34, 485, May, 1940. 14. Levenson, G. I. P., Phot. J., 87B, 18-24, Jan., 1947. 15. Clark, W., /. Chem. Soc, 128, 768, 1926. 16. Sweet, M. H., /. Soc. Mot. Pic. Eng., 44, 419, June, 1945. 17. Bingham, R. H., /-. Soc. Mot. Pic. Eng., 46, 368, May, 1946. 18. Friedman, J. S., /. Soc. Mot. Pic. Eng., 42, 271, May, 1944. 19. Mynall, J. D., Electronic Eng., p. 178, June, 1947. 20. F.I.A.T. Final Report No 976, p. 40 and Fig. 39. H.M.S.O. 21. Evans, R. M., /. Soc. Mot. Pic. Eng., 31, 194, Aug., 1938. 22. Duerr, H. H., and Harsch, H. C, /. Soc. Mot. Pic. Eng., 48, 357, May, 1946. 23. Wright, W. D., Brit. Kine., 13, 1, July, 1948 ; Breckenridge, F. C, and Schaub, W. R, J. Opt. Soc. Am., 29, 370, 1939. DISCUSSION Mr. Emmy : I seemed to notice that with question of colour masking. The idea in the all the colour films the green was not as good case of Agfacolor is that if development be as the yellow, red, or blue. Is this the fact, taken to a higher gamma, more brilliant or is it my imagination ? colours are obtained, but the overall con The Author : It is probably due to the trast is much too high. Therefore the fact that the greens are most familiar to us. contrast is cut down again by using a black The very fact that one is used to them makes and-white mask of the reverse sign ; if a one more likely to pick holes in them. The negative is being developed a positive mask .primary dyes are selected with reference to will be used. Something is still gained in a great many factors, and one cannot always saturation ; but again, it is a compromise, choose them so all colours are reproduced Mr. Irwin : Can any statement be made well. as to the possibility of using Agfacolor for Mr. Emmy : Would it be possible in that motion picture film in this country ? case to do something with the light sources The Author : Certain manufacturers to make up for the deficiency in green are experimenting with the production of sensitivity ? Agfacolor-type material. I do not know The Author : I have not spoken of how far they have got. deficiencies in green sensitivity; but it Mr. F. G. Gunn : One can understand the might be that they were the wrong colour. difficulty of manufacturers in this country There might be a general shift rather than in putting down the necessary plant and a lack of brightness. machinery, but the same conditions do not The Author (in reply to another ques necessarily apply in America, although in tion) : I do not want to go into the whole our own Society Mr. Williford has explained