Method and apparatus for determining printing exposure amount

Details Method and apparatus for determining printing exposure amount Method and apparatus for determining printing exposure amount

1990-09-18

1991-08-20

Brown, Brian W.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 77, G03B 2780

Patent

active

050418688

ABSTRACT:
A photographic printer for making a trimming print has a zoom lens whose focal length can be changed in accordance with a trimming magnification. Exposure time is corrected based on a reciprocity law failure correction amount corresponding to the magnification of the zoom lens, whereby a density of the photoprint is corrected as to a change in a reciprocity law failure. According to a preferred embodiment, test prints are made respectively at a plurality of magnifications of the zoom lens. The densities of the finished test print are measured to form reciprocity law failure correction data automatically in the photographic printer so that the measured densities coincide with standard densities.

REFERENCES:
patent: 4285543 (1981-08-01), Vinatzer
patent: 4359273 (1982-11-01), Aihara et al.
patent: 4444506 (1984-04-01), Isono et al.
patent: 4525065 (1985-06-01), Takagi et al.
patent: 4984015 (1991-01-01), Okino

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