Automated exposure-contrast control index meter
OwnerJames S. Shreveinventor
Life of this patent
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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. 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.
Claims15
An apparatus for determining a film development parameter and camera exposure setting for each frame of film for subject matter to be photographed, comprising,
- means for sensing the luminous intensities of selected areas of said subject matter to be photographed and for providing first electrical signals which correspond to said sensed intensities,
- means for selecting desired film densities for each of said selected areas,
- means for providing second electrical signals indicative of said selected desired film densities which it is desired for said sensed luminous intensities to produce on said film,
- means responsive to said first and second electrical signals for deriving said film development parameter and said exposure setting and for providing an output signal indicative of said film development parameter and said exposure setting,
- means responsive to said output signal for controlling said camera exposure setting for said each frame of film, and
- means responsive to said output signal for causing subsequent development of said each frame of film to correspond to said derived film development parameter.
Dependencies are inferred from the claim text.