CRT method of and apparatus for illuminating photographic negatives to produce a hard copy
First Claim
1. An apparatus for producing a positive photographic print from a photographic negative by exposing photographic image receiving media, the apparatus comprising:
- means for determining chromic and luminance characteristics of the photographic negative and for generating a signal representing the determined chromic and luminance characteristics of the photographic negative;
means for determining required levels of chromic and luminance necessary for faithful reproduction of the positive photographic print based on the chromic and luminance characteristics of the photographic negative, including;
means for determining chromic and luminance characteristics of a swatch of said photographic image receiving media having different shades of chromic intensity and for generating a signal representing the chromic and luminance characteristics of each shade of chromic intensity;
means for ascertaining levels of chromaluminance that produced the chromic and luminance characteristics of each shade of chromic intensity of the swatch; and
means for comparing the ascertained chromaluminance of each shade of chromic intensity of the swatch with the chromic and luminance character-istics of the photographic negative to determine the required level of chromic and luminance intensity for faithful reproduction of the photographic negative;
cathode ray tube means for exposing the photographic image receiving media to produce a positive photographic print; and
means for controlling the chromance and luminance of the cathode ray tube means so that chromance and luminance of the cathode ray tube means are substantially equal the required levels of chromance and luminance.
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Accused Products
Abstract
A CRT apparatus for illuminating color photographic negatives to faithfully produce colored hard copies in photographic printers without the use of dark shutters, heat shields and/or moving color filters. The preferred embodiment of the present invention employs an ordinary color television with a R, G, B input, driven by a signal controller and a specially designed CRT. The controller previews and analyzes the negative with inputs from an ordinary color television camera illuminated by a standard light source. A sample of the recording media for the hard copy, which was exposed to a pattern generated by the controller and displayed on the CRT, acts as a standard reference for the controller'"'"'s mathematical manipulations to analyze the hard copy media sample, and control the Kelvin temperature and luminance settings of the CRT when exposing the hard copy through the subject negative in order to achieve automatic color balance in the hard copy.
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Citations
23 Claims
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1. An apparatus for producing a positive photographic print from a photographic negative by exposing photographic image receiving media, the apparatus comprising:
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means for determining chromic and luminance characteristics of the photographic negative and for generating a signal representing the determined chromic and luminance characteristics of the photographic negative; means for determining required levels of chromic and luminance necessary for faithful reproduction of the positive photographic print based on the chromic and luminance characteristics of the photographic negative, including; means for determining chromic and luminance characteristics of a swatch of said photographic image receiving media having different shades of chromic intensity and for generating a signal representing the chromic and luminance characteristics of each shade of chromic intensity; means for ascertaining levels of chromaluminance that produced the chromic and luminance characteristics of each shade of chromic intensity of the swatch; and means for comparing the ascertained chromaluminance of each shade of chromic intensity of the swatch with the chromic and luminance character-istics of the photographic negative to determine the required level of chromic and luminance intensity for faithful reproduction of the photographic negative; cathode ray tube means for exposing the photographic image receiving media to produce a positive photographic print; and means for controlling the chromance and luminance of the cathode ray tube means so that chromance and luminance of the cathode ray tube means are substantially equal the required levels of chromance and luminance. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for producing a positive photographic print from a photographic negative by exposing photographic image receiving media, the apparatus comprising:
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means for determining chromic and luminance characteristics of the photographic negative and for generating a signal representing the determined chromic and luminance characteristics of the photographic negative; means for determining required levels of chromic and luminance necessary for faithful reproduction of the positive photographic print based on the chromic and luminance characteristics of the photographic negative; cathode ray tube means comprised of a tri-colored cathode ray tube for exposing the photographic image receiving media to produce a positive photographic print, wherein the cathode ray tube comprises; an envelope; and a lens fused to the envelope in lieu of a face plate, the lens having an entrance pupil; and means for controlling the chromance and luminance of the cathode ray tube means so that chromance and luminance of the cathode ray tube means are substantially equal the required levels of chromance and luminance. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method for producing a positive photographic print from a photographic negative by exposing photographic image receiving media, the method comprising:
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determining chromic and luminance characteristics of the photographic negative; determining required levels of chromance and luminance necessary for faithful production of a positive photographic print based on the determined chromance and luminance characteristics of the photographic negative by; determining chromic and luminance characteristics of a swatch of said photographic image receiving media having different shades of chromic intensity; generating a signal representing the chromic and luminance characteristics of the different shades of chromic intensity of the swatch; ascertaining standard levels of chromaluminance that produced the chromic and luminance characteristics of each shade of chromic intensity of the swatch; and comparing the standard levels of chromaluminance that produced the chromic and luminance characteristics of each shade of chromic intensity of the swatch with the chromic and luminance characteristics of the photographic negative to determine the required levels of chromance and luminance; and controlling the chromance and luminance of cathode ray tube so that the chromance and luminance of the cathode ray tube are substantially equal to the required levels of chromance and luminance so as to expose the photographic image receiving media to produce the positive photographic print. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification