Optics: measuring and testing – By shade or color – Photography
Patent
1984-04-02
1986-12-30
Evans, F. L.
Optics: measuring and testing
By shade or color
Photography
355 38, G01J 100, G03B 2780
Patent
active
046325581
ABSTRACT:
A color analyzer for determining the exposure time required for printing color photographs by an enlarger comprising a measuring unit having three photoelectric cells. The analyzer is further provided with a control unit being electrically connected to the measuring unit and having an electric circuit for determining the exposure time. According to the present invention, the characteristic values of the color components, blue, green and red are measured by a respective photoelectric cell for a test print as electric signals generated by the cells at voltages of S.sub.BO, S.sub.GO, and S.sub.RO at the associated exposure time t.sub.o. These values are stored in a memory and the exposure time t of an arbitrary picture is determined with the aid of measured signals S.sub.B, S.sub.G and S.sub.R for the components blue, green, and red. This determination is computed by way of the formula:
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patent: 3797933 (1974-03-01), Sable
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patent: 4176946 (1979-12-01), Takahashi
patent: 4236818 (1980-12-01), Fauchier, II
patent: 4353641 (1982-10-01), Merlo
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Sribnick, Popular Photography, V. 82, No. 3, Mar., 1978, pp. 117-119, 152.
Maassen Egbertus J. P.
van Meel Franciscus A. M. M.
Evans F. L.
Harringa Joel L.
Miller Paul R.
U.S. Philips Corporation
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