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CRT method of and apparatus for illuminating photographic negatives to produce a hard copy

  • US 5,349,418 A
  • Filed: 01/05/1993
  • Issued: 09/20/1994
  • Est. Priority Date: 10/09/1991
  • Status: Expired due to Fees
First Claim
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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:

  • 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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