Photocopying – Projection printing and copying cameras – Multicolor picture
Patent
1995-03-13
1997-09-23
Braun, Fred L.
Photocopying
Projection printing and copying cameras
Multicolor picture
355 77, G03B 2780
Patent
active
056710410
ABSTRACT:
A photographic printer has yellow, magenta and cyan color-correcting filters, which are inserted in a light source and a developed photographic film. A frame to be printed is measured photometrically in three-color separation to obtain optical density of three primary colors. Positions for setting the filters in a light path are controlled according to the density. The frame is printed by the printing light on color photographic paper. Data of plural density domains, dividing a three-dimensional density space, are preset. The density space is defined by coordinates on which the density of the three primary colors is taken. Data of matrix elements are stored in association respectively with the density domains. One of the density domains is selected in accordance with the density obtained from the frame. Matrix elements associated with the selected density domain are selected from the matrix elements. Matrix operation is executed in accordance with the obtained density and the selected matrix elements, for obtaining a filter position at which three-color components of printing light from the light source is optimized.
REFERENCES:
patent: 4769695 (1988-09-01), Terashita
patent: 4809198 (1989-02-01), Terashita
patent: 4974017 (1990-11-01), Terashita
patent: 4999668 (1991-03-01), Suzuki et al.
Braun Fred L.
Fuji Photo Film Co. , Ltd.
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