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Shutters
Gote
AXIS
C2
Fig. 6. Schematic diagram of a two-lamp step-contact printer, of a type suitable for maintaining registration through two steps of printing without the necessity of changing registration pins: L = lamps; C,, Cg = condenser lenses; A = heat-absorbing glass; F = filterholders.
In order to produce a satisfactory final print with the color images in registration, two requirements in printing equipment must be met.
1. Provision must be made for maintaining registration and correct orientation during the printing of the separation positives from the original negative and during the printing of the internegative from the separation positives.
2. Provision must be made for color timing. If an entire picture is to be printed from an internegative, it is likely that proper timing during the printing of the separation positives and internegative will result in an internegative from which the final release prints can be made at one printer light setting. However, if the final print is made from an intercut original and internegative, the printer used in making the final print will require color-timing equipment. Furthermore, the internegatives will require slightly different intensity timing since an internegative will be of somewhat greater density than the corresponding original negative. This may require an increase in printer intensity of several printer points.
Because of the diversity of printing equipment it is impossible to give specific rules for every kind of printer, but some general suggestions may be useful. To maintain accurate registration it is essential that the full pin
of the registering printer enter the same perforation relative to the frame, both in making the separation positives and in printing these on the internegative. This may be achieved by using a stepcontact printer with registration pins and two light sources, one on each side of the gate, as shown schematically in Fig. 6. In this figure, symmetrically placed on each side of the gate, are shown the lamps, L, the condenser lenses, C\ and C2, the heat-absorbing glasses, A, and the filterholders, F. In making the separations from the camera original, the lamp on one side is used. In printing the separations on the internegative, the lamp on the other side is used. In this way it is unnecessary to turn the separation positives over to maintain emulsion-to-emulsion contact in printing. Another way of accomplishing the same result with a single light source is to have removable pins in the printing gate so that they may be changed to the correct position for the second operation. In the design of any registering printer it is desirable to have the full pin fill the same perforation as was used by the camera. This is not essential to registration when printing from an integral-tripack original but it improves screen steadiness.
In such a step-contact printer, picture sharpness is improved if a partial vacuum is maintained between the two
Anderson, Groet, Horton and Zwick: Color Internegative
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