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ANSCO COLOR PRINTING FILM
TYPE 73J
Fig. 5. Characteristics of Prnting Film, Type 732.
is predominantly green a more desirable effect may be obtained by making the mask with a magenta filter. Flexibility and control of the colour obtained is possibleby this means. The black-andwhite mask is then run in contact with the original, and the masked intermediate duplicate containing at the same time all of the effects, is printed. There is then obtained a conformed master which when printed will show little or no loss in colour brilliance. This masked master will also be
balanced from scene to scene in regard to printing light and filter, and can be contact printed with standard continuous or step printers without the necessity for light changes or special provision for filter changes between scenes. Any number of such masters can be made for export release printing.
Since the original is not essential for release printing it can be stored in a safe place to provide insurance against loss.
Colour Separation Method
A third method for producing intermediate duplicates in the Ansco Color process was described in a paper by Harsh and Friedman2. This method utilises for separation negatives a black-and-white film which has the unique property of giving equal gradation for exposures by blue, green and red light. The purpose here is to expose as consecutive frames on the same strip of film, the red, green and blue separations, so that the problem of registration is minimised even though the film shrinks with age.
The steps of this procedure are shown in Fig. 4. This method has the disadvantage that a special skip-frame release printer is required or, if separate separation positives are made, the release printing will be somewhat slow. It has the advantage, however, that good permanent records of the colour original are obtained, and there is no need for masking to retain good colour reproduction in making the intermediate duplicates. It is an optional method for those who would prefer the additional investment in equipment in order to obtain the advantages offered.
III. RELEASE PRINTING
The release printing stock for the Ansco Color process is Ansco Color Printing Film, Type 732. This film is also of the reversible type, and while fundamentally similar to the other Ansco Color reversible films, it is characterised by a relatively low speed, very fine grain and special sensitisation for printing. This printing stock can be developed to a high maximum density to obtain optimum colour brilliance.
Fig. 5 shows a typical H and D curve for this film. A wedge spectogram of Ansco Color Printing Film (Fig. 6) shows relatively sharp sensitivity peaks in the green and red regions with a partial gap between these peaks. Good separation of the peaks of sensitivity is very essential in a printing film in order to obtain faithful colour reproduction.
Most motion picture printers which are suitable for printing fine grain blackand-white positive stock can be readily adapted to print Ansco Color Type 723