US3186841A - Method of influencing the gradation of color-photographic printing material - Google Patents

Method of influencing the gradation of color-photographic printing material Download PDF

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Publication number
US3186841A
US3186841A US52384A US5238460A US3186841A US 3186841 A US3186841 A US 3186841A US 52384 A US52384 A US 52384A US 5238460 A US5238460 A US 5238460A US 3186841 A US3186841 A US 3186841A
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US
United States
Prior art keywords
printing material
color
positive
layer
exposure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US52384A
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English (en)
Inventor
Berger Heinz
Berghaus Hans
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Agfa Gevaert NV
Original Assignee
Agfa AG
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Filing date
Publication date
Application filed by Agfa AG filed Critical Agfa AG
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Publication of US3186841A publication Critical patent/US3186841A/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/02—Sensitometric processes, e.g. determining sensitivity, colour sensitivity, gradation, graininess, density; Making sensitometric wedges
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
    • G03C7/18—Processes for the correction of the colour image in subtractive colour photography

Definitions

  • the gradation is influenced when printing from subtractive multi-color originals on to subtractive multi-laycr material by a general supplementary exposure prior to, during, or after the printing exposure.
  • a flattening of the high-lights is achieved when printing from a negative on to a positive material, and preferably a flattening of the shadows is achieved when printing from a reversal diapositive on to a reversal printing material.
  • the procedure adopted in practice is that the supplementary exposure is not carried out with unfiltered light, but with a filtering which corresponds to the basic number or the neutral value of the printing material, while the actual printing exposure is carried out with the filtering which is necessary for the neutral position of the image.
  • the filtering of the supplementary exposure can be different from the filtering of the image exposure.
  • the neutral value of the color photographic printing material in the printing apparatus being used 3,186,841 Fatented June 1, 1965 is established, it being advantageous to use a printing material with very hard gradation.
  • a general supplementary exposure without printing original, using neutral filtering is carried out prior to, during or after the image exposure proper, depending on the existing printing original or the desired final image gradation, the intensity or the duration of the supplementary exposure being chosen in accordance with that which, from experience, is necessary for the desired flattening of the gradation of the image.
  • the print filtering is separately established in known manner for the actual main exposure through the printing original.
  • the layers must be initially exposed with too steep gradations, using the light to which they are sensi tive. If for example a so-called unstable gradation of the printing material exists, that is to say, if the three color density curves of the color photographic multi-layer material are not parallel or superimposed or at least one gradation is steeper than the others, a neutral position of the material can be produced by initially exposing the emulsion layer with the steeper gradation with the light to which it is sensitive, whereby the desired flattening of this individual gradation is obtained.
  • the supplementary exposure can if necessary be carried out with subtractive or additive filters.
  • he process is mainly suitable for the machine processing of color photographic multi-layer material, but it can also be used for influencing the gradation of sheet material.
  • a bending in gradation of a single layer of a multilayer material, as produced by the process of the invention, is illustrated by way of example in the accompanying figure.
  • Curve I shows the gradation curve which was obtained Without prior exposure.
  • Example A multi-layer positive material of the following composition is used:
  • a number of subtractive color filters is combined. Through this filter combination a black-white transparency is printed on the above-mentioned positive material using white light.
  • the filter combination is varied so long till the black-white transparency is reproduced on the positive material as a neutral grey image without any color-shade. If, for example, a blue color-shade appears, a magenta and a cyan filter of adequate density have to be used for getting a neutral grey reproduction.
  • the ascertained filter combinations are used later on for the supplementary exposure.
  • An exposed 3-layer negative film is printed on the above-mentioned positive material by using a subtractive filter combination ina manner Well-known, so that the original image of the negative film is reproduced on the printing material without color-defects. If, for example, the color-negative has a green color-shade, a magenta color filter of adequate density has to be used for this main or image exposure.
  • the printing material is exposed without interposition of the original using diffused light.
  • the filtering thereof corresponds to the neutral value of the printing material.
  • the intensity, respectively the time of exposure should be -20 percent of the main or image exposure.
  • the positive material is developed, bleached, fixed and Washed in the manner well-known in color photography.
  • the principle of the method of the invention is not limited to subtractive multi-color processes. Application in connection with an additive multi-color process is possible without difficulties.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Color, Gradation (AREA)
US52384A 1959-09-03 1960-08-29 Method of influencing the gradation of color-photographic printing material Expired - Lifetime US3186841A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA32780A DE1127713B (de) 1959-09-03 1959-09-03 Verfahren zur Beeinflussung der Gradation von farbenphotographischem Kopiermaterial

Publications (1)

Publication Number Publication Date
US3186841A true US3186841A (en) 1965-06-01

Family

ID=6927917

Family Applications (1)

Application Number Title Priority Date Filing Date
US52384A Expired - Lifetime US3186841A (en) 1959-09-03 1960-08-29 Method of influencing the gradation of color-photographic printing material

Country Status (6)

Country Link
US (1) US3186841A (xx)
BE (1) BE594676A (xx)
CH (1) CH388774A (xx)
DE (1) DE1127713B (xx)
GB (1) GB945372A (xx)
NL (1) NL255538A (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4175856A (en) * 1977-11-04 1979-11-27 Pako Corporation Photographic printer with automatic density and color corrections for paper gamma

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4425417A (en) 1979-09-17 1984-01-10 Ingalls Marjorie D Method for preparation of a color proof from a set of color separation films, masks or the like
US4522491A (en) * 1979-09-17 1985-06-11 Ingalls Marjorie D Method for reproducing one or more target colors on photographic paper or the like
US4411529A (en) 1979-09-17 1983-10-25 Ingalls Marjorie D Color reference data base and method of preparing same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2285262A (en) * 1939-05-06 1942-06-02 Gen Aniline & Film Corp Process and apparatus for the printing of subtractive multicolor images
US2352914A (en) * 1940-11-15 1944-07-04 Technicolor Motion Picture Photographic printing
US2529975A (en) * 1948-03-11 1950-11-14 Eastman Kodak Co Method of making color prints from color transparencies
US2780155A (en) * 1951-01-10 1957-02-05 Debrie Andre Victor Le Clement Means for the continuous printing of colored films
DE1007622B (de) * 1954-08-16 1957-05-02 Edgar Gretener Dr Ing Verfahren zur Herstellung eines subtraktiven Farbfilms mit einer neutralgrauen Registrierung und drei farbigen Registrierungen, insbesondere Bildern

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE564943C (de) * 1929-07-24 1932-11-24 Rca Corp Photographisches Tonaufzeichnungsverfahren zur Erzielung intensitaetsproportionaler Schwaerzung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2285262A (en) * 1939-05-06 1942-06-02 Gen Aniline & Film Corp Process and apparatus for the printing of subtractive multicolor images
US2352914A (en) * 1940-11-15 1944-07-04 Technicolor Motion Picture Photographic printing
US2529975A (en) * 1948-03-11 1950-11-14 Eastman Kodak Co Method of making color prints from color transparencies
US2780155A (en) * 1951-01-10 1957-02-05 Debrie Andre Victor Le Clement Means for the continuous printing of colored films
DE1007622B (de) * 1954-08-16 1957-05-02 Edgar Gretener Dr Ing Verfahren zur Herstellung eines subtraktiven Farbfilms mit einer neutralgrauen Registrierung und drei farbigen Registrierungen, insbesondere Bildern

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4175856A (en) * 1977-11-04 1979-11-27 Pako Corporation Photographic printer with automatic density and color corrections for paper gamma

Also Published As

Publication number Publication date
BE594676A (xx)
CH388774A (de) 1965-02-28
DE1127713B (de) 1962-04-12
NL255538A (xx)
GB945372A (en) 1963-12-23

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