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COLOUR CINEMATOGRAPHY
BI-CHROMATIC AND TRI-CHROMATIC SUBTRACTIVE
SYNTHESIS.
(From the Italian)
{Continued from Nos. 2 and 5).
As already stated, the only process of colour cinematography which has so far been put into practice is the process whereby the analysis or selection is limited to two colours and synthesis is obtained by superposing two series of monochrome images — one red and the other green. A single film takes the two perfectly coincident images, the red on one side and the green on the other.
The images are of normal dimensions and the film is projected by the usual apparatus, the only requisite precaution being to ensure that there be plenty of light, in view of the greater opacity of these colour films as compared with the usual ones.
No description of the processes by which such bi-chromatic films are obtained has been published, nor can the process be protected by patent, since the principle of selection, like that on which the synthetic process is based, is public property.
The technique to be followed for the production of such films has been reconstituted by the author in these notes, in the light of an examination of several pieces of bi-chromatic film and of a number of experiments.
It is clear that, while we may be able to lay down the technical bases of the several operations and more especially to give particulars regarding the production of the two series of monochromes, it is impossible to say anything on the mechanical part of the process, which must undoubtedly present difficulties; these however are not so formidable that they cannot be overcome in laboratories specially devoted to mechanical cinematography.
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