Photographic color densitometer check plate

Details Photographic color densitometer check plate Photographic color densitometer check plate

1974-09-18

1977-09-13

Corbin, John K.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

350317, 350318, 356173, 356189, 356194, 356256, G01J 346

Patent

active

040478173

ABSTRACT:
A density check plate comprising a support having thereon a plurality of light absorbing filters, each of which has a light transmission limit wavelength at a different spectral wavelength and which completely and sharply absorbs light of a wavelength shorter than the wavelength of the light transmission limit wavelength.

REFERENCES:
patent: 2809552 (1957-10-01), Ciavola
patent: 3685900 (1972-08-01), Kirby

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