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XII. PROCESSING AND RELEASE PRINTING
effect control by means of a change in area of an aperture or diaphragm often have appreciable inertia, and the mass in the mechanism must be moved quickly to effect the change. With certain arrangements it is difficult if not impossible to effect the change completely between two adjacent printed frames. Where quantity prints are to be made with scene density changes at high speed, a traveling matte may be used. This is merely a film interposed at the gate between the light source and the image-bearing film that alters the light intensity in the manner of a
Fig. 94. Bell and Howell, model J, 16-mm combination printer.
Adjustable width aperture is used to effect changes in print exposure. It has a single printing head and lamp with separate apertures for picture and for sound printing. Can make a silent picture print or a sound print in a single trip through the printer; it can also make a combination print from a combination negative. To make a combination print from separate picture and sound negatives requires two trips of the raw stock through the printer; one trip to print picture, and the other to print sound.
neutral density filter. Traveling mattes are rarely used in 16-mm release printing; it is more practicable to make the timing corrections in the dupe negative in such manner that the release prints may be printed at a single printer light setting.
Typical commercial printers available are the Bell and Howell Model J (Fig. 94) and the Depue Combination. The Depue (Fig. 93) has the advantage that it provides three sets of feed and takeup reel arms, one for accommodating the picture image-bearing film, the second for accommodating the sound image-bearing film, and the third for accommodating the raw stock to be printed; a combination print may be made