Method of determining exposure time for photographic printer

Details Method of determining exposure time for photographic printer Method of determining exposure time for photographic printer

1988-05-26

1990-02-13

Hix, L. T.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 77, G03B 2752

Patent

active

049011065

ABSTRACT:
A method of determining exposure time for a photographic printer on the basis of a cubic function is provided. A plurality of test printings are conducted by using different print magnifications, in such a manner as to obtain the same density of test prints. Exposure times T during test printings are measured in correspondence with the print magnifications m. On the basis of the print magnifications m and the exposure times T, the exposure time is expressed as a cubic function (am.sup.3 +bm.sup.2 +cm+d) of the print magnification. An exposure time for actual printing is determined on the basis of the above-mentioned cubic function, and printing is effected.

REFERENCES:
patent: Re32424 (1951-02-01), Clark
patent: 4451142 (1984-05-01), Takenaka et al.
patent: 4610539 (1986-06-01), Kaneko et al.
patent: 4643562 (1987-03-01), Kaneko et al.

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