Color correction method for panchromatic printing and its device

Photocopying – Projection printing and copying cameras – Multicolor picture

Patent

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Details

355 71, 355 77, 355 88, G03B 2732, G03B 2752

Patent

active

040871746

ABSTRACT:
A photographed and developed panchromatic negative film is mounted on an enlarger. White light will, after passing through this panchromatic negative film, be mixed up uniformly in a diffuser. This mixed-up light will print on panchromatic paper each colored image of cyan, magenta and yellow through each color filter in a fixed grade density of red, green and blue-violet. Of these printed images the differences between an image at the least visible section and other images will be indicated as an unbalance in the three primary colors. Then, a color filter for color correction corresponding to this unbalance will be selected. Next, removing the diffuser from the enlarger, alternatively the selected color correction filter will be mounted thereon. Again, when a panchromatic negative film is printed on panchromatic paper, a positive picture that will balanced in the three primary colors can be obtained.

REFERENCES:
patent: 3672766 (1972-06-01), Levy
patent: 3748045 (1973-07-01), Mitchell
patent: 3967897 (1976-07-01), Rogers

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