Method of determining exposure

Details Method of determining exposure Method of determining exposure

1989-09-12

1990-11-27

Hix, L. T.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 68, 355 77, G03B 2780

Patent

active

049740172

ABSTRACT:
An exposure determining method. Light is measured with respect to a plurality of portions of film images into which images on films to be subjected to printing are divided, thereby obtaining photometric data. The printing exposure condition for a reference film type is corrected with respect to at least one color selected on the basis of the difference in the three color balance of one of the films to be subjected to printing, from that of the reference film type. The exposure is determined on the basis of the corrected printing exposure condition and on the basis of image densities with respect to three colors which are calculated on the basis of photometric data belonging to a specific color region. In one form of the method, items of photometric data are classified by determining to which color regions these items of data belong, certain color regions are selected in accordance with the numbers of items of the photometric data, and the exposure is determined using those photometric data belonging the selected color regions. This makes it possible to determine the correct exposure of an original image formed by photography using a light source different from daylight.

REFERENCES:
patent: 4101216 (1978-07-01), Grossmann
patent: 4101217 (1978-07-01), Fergg et al.
patent: 4203671 (1980-05-01), Takahashi et al.
patent: 4406538 (1983-09-01), Buhler
patent: 4492458 (1985-01-01), Bickl et al.
patent: 4561768 (1985-12-01), Fursich et al.
patent: 4589766 (1986-05-01), Fusich et al.
patent: 4641959 (1987-02-01), Terashita

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