Boots – shoes – and leggings
Patent
1989-04-21
1991-06-04
Lall, Parshotam S.
Boots, shoes, and leggings
36457101, 356404, 356443, 382 41, G03B 2780, G01J 350
Patent
active
050219782
ABSTRACT:
A predetermined gradation of film transmittance levels, e.g. a gray scale, provided by a film exposure system is calibrated so as to consistently create an image on photographic film in accordance with the predetermined gradation of film transmittance levels. A light source is responsive to a drive signal, for generating light so that the exposure of different portions of the film to the light can be varied as a function of the drive signal so as to vary the resulting transmittance level of the portions of the film after the exposed portions of film are developed in order that the image can be formed on the film, and a sensing device senses the transmittance level of a developed portion of film exposed to at least one preselected value of light exposure and generates a transmittance level signal representative of the sensed transmittance level. The drive signal is adjusted as a function of the sensed transmittance level so that the range of transmittance levels produced by exposing the film to the light in response to the adjusted drive signal approximates the predetermined gradation of film transmittance levels.
REFERENCES:
patent: 4646252 (1987-02-01), Terashita
patent: 4666307 (1987-05-01), Matsumoto et al.
patent: 4809198 (1989-02-01), Terashita
patent: 4855940 (1989-08-01), Richardson et al.
patent: 4884221 (1989-11-01), Sugiyama et al.
Bernstein Stanley
Lorbiecki John E.
Rice Richard C.
Stone Barry N.
Camtronics, Ltd.
Lall Parshotam S.
Mattson Brian M.
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