Adjusting photographic printer color exposure determination algo

Details Adjusting photographic printer color exposure determination algo Adjusting photographic printer color exposure determination algo

1989-12-11

1990-10-09

Gellner, Michael L.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 68, 355 77, G03B 2780

Patent

active

049624032

ABSTRACT:
This invention relates to a printing system which makes use of a color exposure determination algorithm. If the printing system permits operator controlled reprinting, then the algorithm's coefficients may be optimized by reprinting negatives using exposures that have been precisely corrected by the operator. This invention teaches that a most efficient way to select the negatives for reprinting is to chose those which lie in two ranges of the "hat" statistic for any or all of the color exposure determination algorithm equations used to make the print. It also teaches how to automatically re-optimize the algorithm coefficients on a periodic basis using data collected automatically during the reprinting operation.

REFERENCES:
patent: 4159174 (1979-06-01), Rising
patent: 4526462 (1985-07-01), Hope et al.
patent: 4845551 (1989-07-01), Matsumoto

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