Photocopying – Projection printing and copying cameras – Multicolor picture
Patent
1978-05-08
1980-03-11
Hix, L. T.
Photocopying
Projection printing and copying cameras
Multicolor picture
355 77, 355 88, G03B
Patent
active
041926056
ABSTRACT:
Color prints from transparencies which constitute frames or sections of universal film are made on printing paper by ascertaining the quotient or difference of integrated transmittance of the transparencies in green and red light, comparing the signal which denotes such ratio with a variable reference signal whereby the resulting comparison signal denotes the color temperature of light by which the respective transparency was exposed, and carrying out color corrections to depart from correction to neutral gray in dependency upon whether the ascertained color temperature denotes exposure in daylight or artificial light. The value of the reference signal is changed in such a way that the intensity of the ratio-designating signal which is necessary for generation of a comparison signal denoting the switchover point between the classification of transparencies into those respectively exposed by daylight and artificial light is lowered when the overall density of the transparency is lower and vice versa.
REFERENCES:
patent: 3029691 (1962-04-01), Goddard et al.
patent: 3502410 (1970-03-01), King et al.
patent: 3653759 (1972-04-01), Klein
patent: 3697174 (1972-10-01), McCune
patent: 3867029 (1975-02-01), Weinert
Fergg Berthold
Findeis Gunter
Zahn Wolfgang
AGFA-Gevert, A.G.
Brady W. J.
Hix L. T,.
Kontler Peter K.
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