Optics: measuring and testing – Photometers – Photoelectric
Patent
1980-06-06
1983-02-15
Arnold, Bruce Y.
Optics: measuring and testing
Photometers
Photoelectric
354 23R, 354 41, 354 50, 354 58, 356221, G01J 144, G03B 724
Patent
active
043738109
ABSTRACT:
An apparatus and method for determining a film development parameter and a camera exposure setting to compensate for the luminous dynamic range of a subject being photographed which takes film non-linearities into account. Film characteristic curve data is stored in a read only memory of the apparatus. In a semi-automatic embodiment, information corresponding to desired film densities for two areas of the subject matter is manually inputted to the apparatus, which is then pointed towards the two areas. In an automatic embodiment, information corresponding to desired film densities for the brightest and least bright areas of the subject to be photographed is manually inputted, the entire subject is automatically scanned by a vidicon or equivalent means, and the brightest and least bright areas of the subject are automatically detected. During operation, film characteristic curve data corresponding to the desired film densities is retrieved from the read only memory and is utilized in the calculations of development parameter and exposure setting.
REFERENCES:
patent: 4304473 (1981-12-01), Shreve
patent: 4309089 (1982-01-01), Harvey
Arnold Bruce Y.
Edelberg Nathan
Elbaum Saul
Gibson Robert P.
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