Exposure condition setting method for photographic printer

Details Exposure condition setting method for photographic printer Exposure condition setting method for photographic printer

1989-12-18

1991-03-19

Hix, L. T.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 77, G03B 2780

Patent

active

050015125

ABSTRACT:
In a method of setting exposure conditions for three colors in a photographic printer, a difference in density between a previously provided reference print and a test print made from a control negative without exposure correction is corrected, one color at a time, by making an exposure corrected by the use of an exposure correction value which is obtained one color at a time by multiplying the difference in density between the test print and the previously provided reference print by a predetermined correction coefficient. First to fifth test prints are made from a control negative in first to fifth different exposure conditions where corrections are effected for density in the first exposure condition, for density and all of yellow, magenta and cyan, in the second exposure condition, for density and each one of yellow, magenta and cyan in each of the third to fifth exposure conditions. Three color densities of the first test prints are detected and compared with those of the second to fifth test prints, respectively, to detect a ratio of change of density to exposure between the first test prints and each of the second to fifth control prints, thereby obtaining a correction coefficient, color by color.

REFERENCES:
patent: 4611918 (1986-09-01), Nishida et al.
patent: 4657378 (1987-04-01), Hope et al.

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