Photographic printer and method for determining exposure amount

Details Photographic printer and method for determining exposure amount Photographic printer and method for determining exposure amount

1986-12-09

1987-12-01

Hix, L. T.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 68, G03B 2773

Patent

active

047100192

ABSTRACT:
In a method and apparatus for determining a printing exposure amount in a photographic printing system, a characteristic value of a negative film to be printed is first obtained and an exposure amount necessary for printing the negative film is calculated from the characteristic value thereof. Information regarding a density key of the negative film is inputted in accordance with the visual discrimination of the negative film. The device for controlling the determination of the exposure amount on the basis of the density key information includes a unit for correcting the exposure amount in accordance with the density key information and a unit for classifying the inputted density key information and selecting exposure operation formulas based on the classification of the density key information so as to thereby determine a printing exposure amount. The selection of one of the abovenoted two units is done by a selecting switch as occasion demands.

REFERENCES:
patent: 3947110 (1976-03-01), Yamada
patent: 4080066 (1978-03-01), Betzold et al.
patent: 4099862 (1978-07-01), Bickl et al.
patent: 4168120 (1979-09-01), Freier et al.
patent: 4235551 (1980-11-01), Harvey
patent: 4299479 (1981-11-01), Harvey et al.
patent: 4339517 (1982-07-01), Akimoto
patent: 4589766 (1986-05-01), Fursich et al.

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