Method for determining exposure amount in image copying apparatu

Details Method for determining exposure amount in image copying apparatu Method for determining exposure amount in image copying apparatu

1990-07-10

1992-01-14

Hix, L. T.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 68, 355 77, G03B 2772, G03B 2780

Patent

active

050814850

ABSTRACT:
A method for determining exposure amount by making use of the fact that values in which the photometric data on a lowest-density portion of a color film is subtracted from tricolor photometric data are approximately the same irrespective of the type of film. The lowest-density data is subtracted from the tricolor photometric data to determine tricolor corrected data. This tricolor corrected data is normalized, and the tricolor normalized data is compared with a reference value so as to be classified into tricolor normalized data. The tricolor photometric data is selected in correspondence with this classification, and the exposure amount is determined on the basis of an average value of the tricolor photometric data selected. As a result, it is possible to print various types of film under the conditions of print exposure of a reference film type without requiring information indicating the film type.

REFERENCES:
patent: 4101216 (1978-07-01), Grossmann
patent: 4101217 (1978-07-01), Fergg et al.
patent: 4274732 (1981-06-01), Thurm et al.
patent: 4279502 (1981-07-01), Thurm et al.
patent: 4561768 (1985-12-01), Fursich et al.
patent: 4589766 (1986-05-01), Fursich et al.
patent: 4627719 (1986-12-01), Nitsch et al.
patent: 4942424 (1990-07-01), Terashita et al.

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