Photographic printer with automatic slope compensation

Details Photographic printer with automatic slope compensation Photographic printer with automatic slope compensation

1977-11-04

1979-04-17

Hix, L. T.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 77, 355 88, G03B 2778

Patent

active

041497996

ABSTRACT:
The photographic printer of the present invention automatically derives and stores slope compensation factors which are used in subsequent printing to compensate for exposure. Reference or slope center values are stored for a reference negative and prints of various negatives are made. A print which requires correction is selected from the test prints which have been made, and the desired density corrections for that print are supplied to the printer. The density values of the negative from which the print was made are measured, and slope compensation factors are derived from the slope center values, the desired density corrections, and the measured density values. Exposures in subsequent printings are compensated based upon these derived slope compensation factors.

REFERENCES:
patent: 3482916 (1969-12-01), Mey et al.
patent: 3672768 (1972-06-01), Schaub et al.
patent: 3873199 (1975-03-01), Weinert

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