Photocopying – Contact printing – Multicolor printing
Patent
1975-03-14
1977-02-01
Braun, Fred L.
Photocopying
Contact printing
Multicolor printing
355 35, 355 36, G03B 2704
Patent
active
040059340
ABSTRACT:
Color corrections are executed in a bidirectional film printer responsive to units of color correction information arranged on a data storage tape in the sequence in which the color corrections are to be made in the forward direction of film transport. Units of frame count information each representing the frame at which a color correction is to be made are interleaved with the color corrections on the tape in the sequence in which the color corrections are to be made in the forward direction. One color correction and one frame count at a time are retrieved in pairs; the same pairs are retrieved in both directions of film transport. The frames of the master film are counted during transport and compared with the frame count retrieved from the tape to provide the frame indications at which the color corrections are to be made in the forward direction of film transport. A cue signal to execute each color correction is generated responsive to the corresponding frame indication during film transport in the forward direction. During film transport in the reverse direction, a cue signal to execute each color correction is generated responsive to the frame indication corresponding to the next subsequent color correction in the order of the sequence. The transmission of the color correction information to light valves is delayed one cycle in the reverse direction of film transport relative to the forward direction. The frame counts are each referenced to the same point at the beginning of the master film, the frames are continuously counted from this reference point in both directions of film transport, film transport in the forward direction is stopped responsive to an indication on the tape, and film transport in the reverse direction is stopped when the count indicates the reference point at the beginning of the master film is reached.
REFERENCES:
patent: 3502409 (1970-03-01), Balint et al.
patent: 3519347 (1970-07-01), Bowker et al.
patent: 3552852 (1971-01-01), Stemke et al.
patent: 3600089 (1971-08-01), Walter
patent: 3716299 (1973-02-01), Balint
Braun Fred L.
PSC Technology Inc.
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