Photographic printer and color film analyzer apparatus

• US 4,340,905 A
• Filed: 09/12/1980
• Issued: 07/20/1982
• Est. Priority Date: 09/12/1980
• Status: Expired due to Term

• Current Assignee: George H. Balding
• Original Assignee: George H. Balding
• Inventors: Balding, George H.
• Primary Examiner(s): Murray, Richard
• Application Number:
  US06/186,486
• Time in Patent Office: 676 Days
• Field of Search: 358/80
• US Class Current: 358/506
• CPC Class Codes: G03B 27/73 Controlling exposure by variation of spectral composition, e.g. multicolor printers

Abstract

An improved color photographic printing apparatus which has a video analyzer for viewing a film negative before printing, and has circuitry for controlling the color and density of the image and for controlling the printing times of a photographic printer through a mirror computer to produce a photographic print which is the same as the image seen on the video analyzer.

Claims

1. Apparatus for analyzing and printing color and density corrected photographic prints from color film, comprising in combination:

video color film analyzer means for reviewing a positive image on a cathode ray tube taken from a color film, said analyzer having means for adjusting the color and density values of the image on the tube; and

photographic printing means having means for receiving said adjusted color and density values from said video color film analyzer means and simultaneously converting said color and density values into corresponding timed increments for directly controlling the exposure of the color film for immediate use in printing a color and density corrected photograph.

2. An apparatus as set forth in claim 1, wherein said apparatus has control means for controlling both the color and density of the image shown on said cathode ray tube and for controlling the timed increments in said micro processor means.

3. An apparatus as set forth in claim 1, wherein said apparatus has control means for adjusting parameters for different types of films used in said apparatus.

4. An apparatus as set forth in claim 1, wherein said apparatus includes peak detector means for detecting peak amplitudes in said video analyzer means.

5. An apparatus as set forth in claim 1, wherein said apparatus includes means for comparing a projected image of a reference film slide with the image projected on said cathode ray tube.

6. An apparatus as set forth in claim 1, wherein said apparatus includes display means for displaying the digital color and density values on said cathode ray tube.

7. An apparatus as set forth in claim 1, wherein said apparatus has a three stage film negative holding means including a first stage for previewing the negative for proper positioning in the holder;

a second stage for analyzing the negative in said film analyzer means; and

a third stage for printing a color and density image of the negative.

8. An apparatus as set forth in claim 1, wherein said means in said photographic printing means for receiving said adjusted color and density values from said video color film analyzer means and simultaneously converting said values into corresponding timed increments comprises micro processor means.

9. A method of analyzing a film negative and printing a color and density corrected photographic reproduction of the image on the film negative, comprising the steps of

analyzing a film negative with a video film analyzer to project a positive color image of the negative on a cathode ray tube;

adjusting the color and density of the projected image to correct deficiencies in color and density;

converting the adjusted color and density values to digital values;

introducing said digital values directly into a micro processor;

converting said digital values into timed increments; and

applying said time increments to actuate shutter means, printing light and color filter means in a photographic printing means to produce a color and density corrected photograph.

10. A method as set forth in claim 9, including the step of comparing said cathode ray tube projected image with a projected image of a reference color slide to determine desired color balance.