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16 II. MAKING A 16-MM PICTUEE
type.) Fortunately, these films are much cheaper than picture film and are admirably suited to their intended purposes. The price of sound film does not include the cOst of developing, but there are several independent commercial film laboratories that will develop the sound track. However, since something more than "just developing" is usually wanted, it is necessary to be specific in telling the laboratory just what is wanted and how they are to go about doing it.
The Exposure Lamp. To expose the film, light is needed; this is supplied by an incandescent lamp mounted in the recording machine. The exposure is adjusted by a rheostat that changes the lamp brightness. An ammeter is customarily used in the lamp circuit to measure the current ; the brightness of the lamp is measured in terms of the ammeter reading.
The Light Modulator. Interposed between the exposure lamp and the film is the light modulator. This alters the amount of light reaching the film in strict accordance with the sound currents fed to it by the amplifier.
Developing and Printing for Editing
Picture Developing and Picture Work Print
The reversal or color picture film is sent to the film manufacturer's laboratory for developing. When ready, a frame-by-frame copy of the original picture is made (called a work print). For identification purposes, the original picture is often edge-numbered with sequential footage numbers; these edge numbers are copied on the picture work print along with the picture image.
Sound Track Developing and Sound Track Work Print
The sound track is sent to a commercial laboratory for developing When ready, a copy called the sound work print is made. Again, for identification purposes, the original sound track is often edge-numbered with sequential footage numbers ; these numbers are copied on the sound work print along with the sound image.
Rough Assembly of Work Print
Temporarily, the original picture film and the original sound track are set aside for safe-keeping. The picture work print is cut into sections, rearranged into the sequence called for in the script, and spliced