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22 W. H. CARSON [J. S. M. P. E. acteristic curve together with a short toe. So much progress has been made within the past few months that it is impossible to show by graphs the curves of the emulsion now being used, but it may be said that the range of latitude in the present emulsion is far greater than it was thought possible to produce a year ago. In any screen proc- ess it is imperative that the emulsion, no matter how thinly it may be coated, be capable of giving intense blacks, so that any colored area on the reseau may be effectually blocked out, allowing no dilution of the true color by the transmission of a foreign color that is not truly an additive component of the colors in the object being photographed. Second is the question of the spectral value of the filters. Various statements have been made as to the proportion of the incident light that passes through the many types of matrices used in the various processes, and have ranged from ten to twenty-five per cent. In the BLUE-VIOLET GREEN RED 475 550 625 700 400 FIG. 4. Diagram showing the approximate overlapping of the spectral transmission of the color filters used in the Dufaycolor process. Dufaycolor process the filter colors selected do not transmit in short narrow bands, but rather overlap from one to another much in the manner shown in Fig. 4. Whether that is theoretically the proper way to produce true color in a three-color additive process is of no particular concern if a result having a satisfactory color fidelity for the average eye is achieved. At the same time, such a procedure results in marked advantage as to the proportion of light transmitted to the emulsion on the taking film, and increases the luminosity of the resultant picture on the screen with ordinary projection light. (It has been noticed in this connection that a lower screen luminosity seems to be acceptable in color pictures than would be regarded as satisfactory in black-and-white.) The use of filters having such overlapping transmission characteristics may raise a question concerning the dilution of color on reproduction, but that will be covered later. The filters used also provide a remarkable in-