Method of determining exposure condition

Details Method of determining exposure condition Method of determining exposure condition

1992-10-29

1994-10-18

Gellner, Michael L.

Photocopying

Projection printing and copying cameras

Methods

355 38, 355 88, G03B 2780

Patent

active

053573153

ABSTRACT:
An exposure condition is determined with reference to a difference between a density value Dx of a negative film to be printed and a corrected density value DNi (i=x) of a reference film. The method comprises the steps of: measuring density values DNi of a plurality of types of reference films and light amounts Li of a light source at times of measurement of the density values DNi; storing the density values DNi and the light amounts Li as memorized density values and memorized light amounts corresponding to the respective reference films; measuring a current light amount L of a current light source which is used for exposure of the negative film to be printed; calculating a difference logL-logLi=.delta.i between the light amount L and each of the memorized light amounts Li; correcting each of the memorized density values DNi by the use of the difference .delta.i. An exposure condition for the negative film is accurately determined by substituting the density value Dx and the corrected density value DNi (i=x) into a predetermined formula for calculating an exposure condition for a negative film.

REFERENCES:
patent: 4942424 (1993-08-01), Terashita et al.

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