Exposure control method for photographic printer

Details Exposure control method for photographic printer Exposure control method for photographic printer

1990-03-29

1991-03-12

Mathews, A. A.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 77, G03B 2778

Patent

active

049996681

ABSTRACT:
An image frame to be printed is subjected to three color separation and photometry by using three light receiving devices. In order to cancel a photometry error caused by the sensitivity crosstalk of each light receiving device, the measured light amount of each color is subjected to a matrix calculation. The corrected measured light amount by this matrix calculation is converted logarithmically into a measured density. In order to provide a linear relationship between the color correction filter setting position and the measured density, the measured density is converted in a virtual measured density in the linear area. The virtual measured density is corrected by a 3.times.3 matrix calculation to cancel a photometry error caused by unwanted absorption of color correction filters.

REFERENCES:
patent: 3697174 (1972-10-01), McCune
patent: 4154523 (1979-05-01), Rising et al.
patent: 4159174 (1979-06-01), Rising
patent: 4344708 (1982-08-01), Tokuda
patent: 4610538 (1986-09-01), Takenaka
patent: 4707118 (1987-11-01), Terashita
patent: 4736244 (1988-04-01), Shiota et al.
patent: 4782390 (1988-11-01), Hayashi et al.
patent: 4939537 (1990-07-01), Masuda et al.

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