US2179786A - Method and means for making corrected color separation images - Google Patents

Method and means for making corrected color separation images Download PDF

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Publication number
US2179786A
US2179786A US121467A US12146737A US2179786A US 2179786 A US2179786 A US 2179786A US 121467 A US121467 A US 121467A US 12146737 A US12146737 A US 12146737A US 2179786 A US2179786 A US 2179786A
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United States
Prior art keywords
layer
emulsion
image
negative
making
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Expired - Lifetime
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US121467A
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English (en)
Inventor
Arthur C Hardy
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Interchemical Corp
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Interchemical Corp
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Publication date
Application filed by Interchemical Corp filed Critical Interchemical Corp
Priority to US121467A priority Critical patent/US2179786A/en
Priority to GB23931/37A priority patent/GB501661A/en
Priority to FR826397D priority patent/FR826397A/fr
Priority to DE1937I0059095 priority patent/DE689587C/de
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Publication of US2179786A publication Critical patent/US2179786A/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F3/00—Colour separation; Correction of tonal value
    • G03F3/04—Colour separation; Correction of tonal value by photographic means
    • 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

  • This invention relates to -a method of making a corrected color separation image with a single exposure to the subject.
  • the invention includes also a photographic nlm for use in the method.
  • a color separation negative made by photographing a subject through a color filter be corrected by means of a positive of another color separation image made by photographing the subjectA through a filter of a different color.
  • the ordinary method of making such corrections is to mask the color separation negative to be corrected with a positive of the image which is to effect the correction, and then to expose a plate to light passed through the positive and negative. Corrections made by such masking do not produce theoretically correct color separation im ages, but the correction by such masking greatly improves color Separation images.
  • My invention provides for making a. corrected color separation image by a single exposure. It will be described in connection with the accompanying drawings which are diagrammatic sections of films embodying my invention, in which Fig. 1 shows the film before development, Fig. 2 the iilm after development, and Fig. 3 a modiiied nlm.
  • a photographic nlm according to my invention comprises a support carrying two different photographic emulsion layers'.
  • the back layer consists of an emulsion containing silver halide and a dye which sensitizes the emulsion to light in one spectral region; and the front layer consists of an emulsion containing silver halide and dye which sensitizes the emulsion to light in another spectral region.
  • the back emulsion layer in finished form, is relatively fast, and the front emulsion layer, in iinished form, is relatively slow.
  • the sensitizing dye in the back layer absorbs light in a spectral region corresponding approximately to the primary which the color separation image made on the film is to control.
  • the sensitizing dye in the front layer absorbs light in a difl'erent spectral region for correction of the image made on the back layer.
  • the sensitizing dye used in the back emulsion layer is one which sensitlzes theemulsion to iight in the re'd region of the spectrum
  • the sensitizing dye used in the front layer is one which sensitizes the emulsion in another, for example, the green region of the spectrum.
  • color separation image to control a It is desirable but not necessary to place between the two emulsion layers a layer of gelatin containing no silver halide. It is ln some cases also desirable to incorporate a dye in this intermediate gelatin layer, as for example one adapted to absorb light in the same spectral region as the sensltizing dye contained in the front layer so as to prevent light in this spectral region from reaching the back layer.
  • Fig. 1 The lm which has been described is shown diagrammatically in Fig. 1, where it will be seen that the back emulsion layer is placed directly over the support, an unsensitlzed gelatin layer is placed over the back emulsion layer, and the front emulsion layer is placed over the unsensitized gelatin layer.
  • Fig. 3 A possible and less desirable arrangement is shown in Fig. 3, in which the front and back emulsion layers are placed on opposite sides of the support. In this case. an additional layer of dyed gelatin may be placed next to the support, or the support itself may be dyed to constitute a iilter.
  • the support shown in the figures is most desirably a flexible nlm.
  • a rigid support such as a plate oi glass, may be used, and it should be 1 understood that the use of the word nlm in the claims which follow is not intended to exclude the use of a rigid glass support.
  • the two emulsion layers of the nlm may consist of ordinary negative" emulsions, that is, o! emulsions which, alter exposure and normal development, produce negative images of the subject. In this case, it ls necessary to use a method oi development which reverses the image produced in the iront or slow emulsion. A known method oi this sort, which is applicable to the film shown in Fig.
  • an intermediate unsensitiaed gelatin layer is ot advantage in iacilitating the bleaching and redevelopment of the front layer without penetration of the bleaching and developing solutions into the back layer.
  • an intermediate layer containing a dye is used, 5 this dye is most desirably bleached out during the developing process.
  • the back or fast emulsion layer of the iilm may consist of an ordinary "negative" emulsion.
  • the front or slow emulsion layer may consist of a direct positive" emulsion, that is, the type of emulsion which produces a positive image directly with ordinary development.
  • This type of emulsion is described in an article entitled A Film Emulsion for Making Direct Duplicates in a Single Step by W. Barth in the October, 1936 number of Journal of the Society of Motion Picture Engineers. In this case, the double layer nlm is subjected to ordinary development, the developing and xing solutions being allowed to penetrate both layers.
  • a developed nlm which consists of a support carrying two layers, one oi which contains a positive image and the other a negative image, as shown in Fig. 2.
  • the two images have been produced by a single exposure of the two emulsion layers of the nlm to the same subject and as the emulsion which is developed as a negative is relatively fast while that developed as a positive is relatively show, the negative image in the developed illm is stronger than the positive image.
  • the developed nlm therefore, provides a corrected color separation image.
  • the method of making a corrected colorseparation transparency which comprises simultaneously exposing to light from a colored subject two superimposed emulsion layers of different speeds and different spectral sensitivities to produce strong and weak registeringlatent images of different color components and thereafter developing one of said images as a negative and the other as a positive without separation of the layers.
  • the method of producing a corrected color component image of a colored object by use of a photographic element having two sensitive layers 5 permanently attached to a support which comprises forming a negative image of one oi the primary color components of the colored object in one of the sensitive layers, forming a positive image of another of the primary color compo- 10 nents of the colored object in the other sensitive layer, the positive image being superposed and in register with the negative image, and printing both images simultaneously to form a corrected color component record of the colored object.
  • the method of making a corrected color separation transparency consisting o! a main image and a correcting mask in register therewith which comprises making a single exposure tolight from a colored subject of a iilm having 2o two emulsion layers sensitized to light in dii.'- ferent spectral regions, one of said layers being relatively fast and the other relatively slow so that the single exposure produces a strong latent image in one layer and a weak latent Vimage in 25 the other, developing both layers without fixing them, removing the silver image from one layer and converting the remaining silver salts in 'this layer to metallic silver, and fixing both layers to provide a positive silver image in the one layer 30 and a negative silver image in the other layer.
  • the method of making a corrected color separation negative consisting of a main image and a correcting mask in register therewith, which comprises making a single exposure to 35 light from a colored subject oi' a film having a layer of a negative photographic emulsion sensitive to light in one spectral region and a layer of a direct positive photographic emulsion sensitive to light in another spectral region, and de- 40 veloping and fixing both layers at the same time to provide a negative image in the irst layer and a positive image in the second layer.
  • a photographic illm for making color separation negatives comprising two, layers one of 45 which is a relatively fast negative photographic emulsion' sensitive to light in one spectral region, and the other of which is a. relatively slow direct positive photographic emulsion sensitive to light in another spectral region.
  • a photographic iilm for making color separation negatives comprising a back layer oi a relatively fast negative photographic emulsion containing a dye sensitizing the emulsion to light in one spectral region, and a front layer of a relatively slow direct positive photographic emulsion containing a dye sensitizing the emulsion to light in another spectral region.
  • the back or fast emulsion layer of the iilm may consist of an ordinary "negative" emulsion.
  • the front or slow emulsion layer may consist of a direct positive" emulsion, that is, the type of emulsion which produces a positive image directly with ordinary development.
  • This type of emulsion is described in an article entitled A Film Emulsion for Making Direct Duplicates in a Single Step by W. Barth in the October, 1936 number of Journal of the Society of Motion Picture Engineers. In this case, the double layer nlm is subjected to ordinary development, the developing and xing solutions being allowed to penetrate both layers.
  • a developed nlm which consists of a support carrying two layers, one oi which contains a positive image and the other a negative image, as shown in Fig. 2.
  • the two images have been produced by a single exposure of the two emulsion layers of the nlm to the same subject and as the emulsion which is developed as a negative is relatively fast while that developed as a positive is relatively show, the negative image in the developed illm is stronger than the positive image.
  • the developed nlm therefore, provides a corrected color separation image.
  • the method of making a corrected colorseparation transparency which comprises simultaneously exposing to light from a colored subject two superimposed emulsion layers of different speeds and different spectral sensitivities to produce strong and weak registeringlatent images of different color components and thereafter developing one of said images as a negative and the other as a positive without separation of the layers.
  • the method of producing a corrected color component image of a colored object by use of a photographic element having two sensitive layers 5 permanently attached to a support which comprises forming a negative image of one oi the primary color components of the colored object in one of the sensitive layers, forming a positive image of another of the primary color compo- 10 nents of the colored object in the other sensitive layer, the positive image being superposed and in register with the negative image, and printing both images simultaneously to form a corrected color component record of the colored object.
  • the method of making a corrected color separation transparency consisting o! a main image and a correcting mask in register therewith which comprises making a single exposure tolight from a colored subject of a iilm having 2o two emulsion layers sensitized to light in dii.'- ferent spectral regions, one of said layers being relatively fast and the other relatively slow so that the single exposure produces a strong latent image in one layer and a weak latent Vimage in 25 the other, developing both layers without fixing them, removing the silver image from one layer and converting the remaining silver salts in 'this layer to metallic silver, and fixing both layers to provide a positive silver image in the one layer 30 and a negative silver image in the other layer.
  • the method of making a corrected color separation negative consisting of a main image and a correcting mask in register therewith, which comprises making a single exposure to 35 light from a colored subject oi' a film having a layer of a negative photographic emulsion sensitive to light in one spectral region and a layer of a direct positive photographic emulsion sensitive to light in another spectral region, and de- 40 veloping and fixing both layers at the same time to provide a negative image in the irst layer and a positive image in the second layer.
  • a photographic illm for making color separation negatives comprising two, layers one of 45 which is a relatively fast negative photographic emulsion' sensitive to light in one spectral region, and the other of which is a. relatively slow direct positive photographic emulsion sensitive to light in another spectral region.
  • a photographic iilm for making color separation negatives comprising a back layer oi a relatively fast negative photographic emulsion containing a dye sensitizing the emulsion to light in one spectral region, and a front layer of a relatively slow direct positive photographic emulsion containing a dye sensitizing the emulsion to light in another spectral region.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
US121467A 1937-01-21 1937-01-21 Method and means for making corrected color separation images Expired - Lifetime US2179786A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US121467A US2179786A (en) 1937-01-21 1937-01-21 Method and means for making corrected color separation images
GB23931/37A GB501661A (en) 1937-01-21 1937-09-01 Improvements in or relating to photographic film
FR826397D FR826397A (fr) 1937-01-21 1937-09-06 Perfectionnements aux émulsions photographiques
DE1937I0059095 DE689587C (de) 1937-01-21 1937-09-16 Verfahren zur Herstellung von Farbtrennungsbildern

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US121467A US2179786A (en) 1937-01-21 1937-01-21 Method and means for making corrected color separation images

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US2179786A true US2179786A (en) 1939-11-14

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US (1) US2179786A (de)
DE (1) DE689587C (de)
FR (1) FR826397A (de)
GB (1) GB501661A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2420636A (en) * 1942-04-11 1947-05-13 Eastman Kodak Co Photographic masking
US3376135A (en) * 1963-09-26 1968-04-02 Allen E Botney Negative and positive view from a polarized film structure
US3620736A (en) * 1969-10-03 1971-11-16 Eastman Kodak Co Photofabrication system using developed negative and positive images in combination with negative-working and positive-working photoresist compositions to produce resists on opposite sides of a workpiece
US4373022A (en) * 1978-12-28 1983-02-08 Arnold Hoffman Method and apparatus for producing a high speed high resolution radiation sensitive article and a high speed high resolution radiation sensitive article

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE748520C (de) * 1942-09-25 1944-11-03 Verfahren zum photomechanischen AEndern, Berichtigen oder Ergaenzen von Kopiervorlagen, insbesondere von Teilfarbennegativen

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2420636A (en) * 1942-04-11 1947-05-13 Eastman Kodak Co Photographic masking
US3376135A (en) * 1963-09-26 1968-04-02 Allen E Botney Negative and positive view from a polarized film structure
US3620736A (en) * 1969-10-03 1971-11-16 Eastman Kodak Co Photofabrication system using developed negative and positive images in combination with negative-working and positive-working photoresist compositions to produce resists on opposite sides of a workpiece
US4373022A (en) * 1978-12-28 1983-02-08 Arnold Hoffman Method and apparatus for producing a high speed high resolution radiation sensitive article and a high speed high resolution radiation sensitive article

Also Published As

Publication number Publication date
DE689587C (de) 1940-03-28
GB501661A (en) 1939-03-01
FR826397A (fr) 1938-03-30

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