Method for controlling exposure in color photographic printers

Details Method for controlling exposure in color photographic printers Method for controlling exposure in color photographic printers

1986-12-02

1987-11-17

Hix, L. T.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 77, G03B 2778

Patent

active

047071184

ABSTRACT:
In conventional color photographic printers, it is emperically known that the LATD balance of RGB is substantially constant. If the exposures of three primary color components are controlled to be constant in photographic printing, standard color film negatives may be printed with excellent color balance. However, the above LATD control method is not always effective for the film negatives where a specific color is dominant, and those films are often printed with poorly balance color. The present method performs exposure control of RGB with color compensation filters controlling the color with the color compensation filter amount dependent upon factors such as the filter position, filter density, transmission factor, amount of light, etc. This method can therefore control the exposure control values at a high precision without disturbing color balance for all types of films. This method can also prevent fluctuations in density which might otherwise be entailed by the changes in color correction level so as to thereby precisely deal with changes in the sensitivity of the materials of the development process.

REFERENCES:
patent: 3184307 (1965-05-01), Letzer
patent: 3502410 (1970-03-01), King et al.
patent: 4175856 (1979-11-01), Pone, Jr.
patent: 4176946 (1979-12-01), Takahashi
patent: 4279502 (1981-07-01), Thurm et al.
patent: 4362383 (1982-12-01), Yonehara et al.
patent: 4464045 (1984-08-01), Findeis et al.
patent: 4589766 (1986-05-01), Fursich et al.

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