Color balance indicating device

Details Color balance indicating device Color balance indicating device

1978-02-27

1980-06-03

Evans, F. L.

Optics: measuring and testing

By shade or color

Photography

355 38, 356418, G01J 350

Patent

active

042059186

ABSTRACT:
A hand-carriable, compact color meter for indicating proper amount of adjustment of color compensation filters interposed in the light path of a color printer for the compensation of color balance of the light illuminating a film or the slide set on the printer. The color meter includes an indicating lamp, a photocell to be exposed to the light passing through the film or slide, a plurality of optical color filters selectively disposed in front of the photocell to provide the photocell with spectral sensitivities corresponding to the spectral sensitivity of the printing paper, a plurality of fixed or variable resistors selectable in correspondence to the selection of the color filter, and an electric circuit for actuating the indicating lamp in accordance with the relationship between the output of the light measuring circuit and a reference voltage commensurate with the selected one of the resistors. In a preferred embodiment, the color meter further includes a combination of a variable resistor and a filter for determination of exposure time.

REFERENCES:
patent: 3778150 (1973-12-01), Aston
patent: 3984185 (1976-10-01), Vinatzer

Affiliated with

Also associated with

Rating

Color balance indicating device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Color balance indicating device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Color balance indicating device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-713974