US2374505A - Photographic multicolor images - Google Patents

Photographic multicolor images Download PDF

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Publication number
US2374505A
US2374505A US431261A US43126142A US2374505A US 2374505 A US2374505 A US 2374505A US 431261 A US431261 A US 431261A US 43126142 A US43126142 A US 43126142A US 2374505 A US2374505 A US 2374505A
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US
United States
Prior art keywords
layer
copying
image
sensitizing
photographic
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Expired - Lifetime
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US431261A
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English (en)
Inventor
Schneider Wilhelm
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.)
GAF Chemicals Corp
Original Assignee
General Aniline and Film Corp
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Filing date
Publication date
Application filed by General Aniline and Film Corp filed Critical General Aniline and Film Corp
Application granted granted Critical
Publication of US2374505A publication Critical patent/US2374505A/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
    • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
    • G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials

Definitions

  • My present invention relates to photographic multi-color images, and more particularly to an improved process for producing such color photographic images.
  • the color reproduction of the copy can further be improved by sensitizing the copying material only in three sharp bands in the blue, green and red regions in contrast with the sensitization of the negative material the spectrum of which is to represent an image as exact as possible of the solar spectrum having all mixed colors.
  • To ensure a sharp separation in copying it has moreover been suggested to use a copying light having a narrowly limited wave range.
  • these copying processes comprising the use of partially invisible rays there are necessary special expedients and steps. Therefore, such processes obviously are disadvantageous when compared with copying processes including the use of white light.
  • Another object is to provide a method for directly copying color images onto a photographic multi-layer material in a simple manner. Further objects of the present invention will appear from the following description.
  • Figure 1 shows sensitizing curves of sensitizers of a multi-layer material for exposure according to the invention
  • Figure 2 shows absorption curves of the image dyestuffs of a negative material for exposure according'to the invention.
  • Figure 3 shows sensitizing curves of sensitizers for the copying material in accordance with the invention
  • Figure 4 shows absorption curves of image dyestuifs of a copying material in accordance with the invention
  • Figure 5 shows absorption curves of image dyestufls of materials for exposure and reproduction as hitherto used.
  • the objects of the invention are accomplished by using for exposure a multi-layer material the sensitizing ranges of which overlap and in the layers of which dyestufi images having absorption maxima separate from one another as far as possible are produced, and copying the negatives thus obtained onto a multi-layer material the layers of which have narrow sensitizing ranges, the maxima of each sensitization corresponding to the absorption maxima of the dyestuffs of the image to 'be copied whereas the image dyestuffs of the copying material comply with the requirements of the subtractive image reproduction inasmuch as the absorption maxima of these dyestufi's have normal positions.
  • a photographic multi-layer material which comprises a blueabout 430 to about 460 mp, a green-sensitive layer having a sensitizing range from about 440 to about 630 mu with a maximum at about 540 to about 560 m and a red-sensitive layer having a sensitizing range from about 500 to about 750 m l with a maximum at about 630 to about 650 mu (see Figure 1).
  • the red-sensitive layer additionally exhibits a slight sensitivity in the short-wave blue and the blue-sensitive layer a sensitivity in the longwave red as shown in Figure 1.
  • This additional sensitization serves to reproduce all color tones found in nature as'exact as possible. It has been suggested to give a layer of a multiadditional sensitization which copied and is fundamentally different from the.
  • the image dyestufl's for the negative material are so selected in departing from the known methods in which the same dyestuffs are employed for exposure andreproduction (see Figure that the distances apart of their absorption maxima are as large as possible.
  • the overlapping regions of the dyestuffs are reduced and the sensitizing maxima of the positive which lie in the absorption maximum of the negative dyestufl's are likewise farther separated from one another so that an optimum color separation is attained in copying with white light.
  • the maximum sensitizations for the copying material are, for instance, shown in Figure 3. Although the example for the sensitization of the negative holds true in all cases, the maxima of the dyestuffs for the component images of the negative and the proper maximum sensitizations of the positive material may also have another position provided that these maxima are separated from one another as far as possible.
  • the negative dyestuffs have yellow, purple, and blue-green color tones as hitherto required for the subtractive process.
  • the dyestuffs for the positive shall show again the normal colors ofthe subtractive process, for instance, with absorption maxima at about 420-440 m about 520-540 mi, about 640-660 mu as represented in Figure 4. In this way an unobjectionable reproduction in natural colors is obtained without the necessity of using filters absorbing light or special copying lights.
  • the exposure material may be provided with a filter absorbing ultra-violet rays in a similar manner as .described in the French Patent, 837,153. This ultra-violet filter is advanta'geously arranged on the photographic material in the form of a filter layer.
  • dyestuff formers produce dyestufi' images the maximum absorptions of which are widely separated from one another.
  • the dyestuff formers referred to above and hereafter may be prepared according to U. 8. P. 2,186,849.
  • the following sensitizer for green has a maximum of about 550 m l.
  • This sensitizer may be prepared by reacting 4.5-
  • the following sensitizer for red has a maximum at about 640 m
  • the following dyestufl serves for the additional sensitization in the red:
  • the intermediate from which this dyestuff is derived can be made according to Example No, page 22, of British Patent 489,335, while substituting lepidine for the l-methyi benzthiazole of the example.
  • the dyestuff can be made according to lines 81 to 91, page 26 of said British patent while utilizing said intermediate in lieu of that employed in lines 81 to 91, page 26 of said British patent.
  • the following compound is used as the dyestuffformer for blue:
  • the positive material is sensitized by using the following dyestuff as the sensitizer for green.
  • each emulsion layer of which contains a sensitizer the sensitizing range of which overlaps with the sensitizing range of each sensitizer in the other emulsion layers, and each emulsion layer of which contains a dyestuff former capable of producing a dyestuff image with the oxidation products of an aromatic amino developer, said image dyestuffs having absorption maxima which are farther separate from one another than the sensitizing maxima of the corresponding layers, developing the material with said developer to form said dyestufi images and copyobtained onto a photographic multi-layer material the several emulsion layers of which contain sensitizers having narrow sensitizing ranges and sensitizing maxima corresponding to said absorption maxima of the image dyestuflf of the exposure material and dyestuff formers capable of producing dyestuffs with the oxidation products of an aromatic amino developer, said last-name
  • the dyestufi former in the outermost layer of the exposure material is a benzoyla'cetanilide in which the benzoyl radical is substituted by an amide group containing a long alkyl chain
  • the dyestufi former in the intermediate layer of the exposure material is a l-phenyl-5-pyrazolone in material having in superwhich the carbon atom in 3-position is substituted by a stearyl amide phenyl radical
  • the dyestufl former in the innermost layer is a naphalkyl chain
  • the dyestufl former in the intermediate layer of the copyin material is a i-phenyl-li-pyraaolone in which the carbon atom in B-position is substituted by a long alkyl chain
  • the dyestufl former in the innermost layer of the copying material is a naphthol containing an amino group which is substituted by a l

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
US431261A 1940-07-30 1942-02-17 Photographic multicolor images Expired - Lifetime US2374505A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEI0067524 1940-07-30

Publications (1)

Publication Number Publication Date
US2374505A true US2374505A (en) 1945-04-24

Family

ID=7196736

Family Applications (1)

Application Number Title Priority Date Filing Date
US431261A Expired - Lifetime US2374505A (en) 1940-07-30 1942-02-17 Photographic multicolor images

Country Status (5)

Country Link
US (1) US2374505A (fr)
BE (1) BE442543A (fr)
CH (1) CH225798A (fr)
FR (2) FR874457A (fr)
IT (1) IT391164A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4675215A (en) * 1985-09-27 1987-06-23 Economics Laboratory, Inc. Method and composition for the inhibition of corrosion

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4675215A (en) * 1985-09-27 1987-06-23 Economics Laboratory, Inc. Method and composition for the inhibition of corrosion

Also Published As

Publication number Publication date
BE442543A (fr) 1941-09-30
IT391164A (fr)
FR51873E (fr) 1943-05-24
FR874457A (fr) 1942-08-07
CH225798A (de) 1943-02-28

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